97 C2500 Rough Idle/Vibrating at acceleration under 2k RPM+Gas Ground Help ! NO 56K

[rg3918]

Hi everyone - new to this truck and to the forum! I've been reading and hopefully learning a lot over the past couple of days from the forum and need some advice..

Background - 1997 C2500HD 2WD 185k miles

Purchased with check engine light on - error was running lean, and oxygen sensor. So I replaced both oxygen sensors after the cat - drove for awhile - and the light went away.. but still runs rough under 2k rpm.

The truck idles rough, and under acceleration under 2k rpm it is rough. If I press down on the gas and it downshifts and bumps the rpms - it runs fine..

I have changed the following so far:
Spark Plugs
Wires Cap & Rotor
Air Filter (K&N)
Changed Oil & Filter
Fuel Filter
+ Fuel Injector Cleaner

I'm thinking about checking the Mass airflow sensor now. Other ideas I picked up where cam sensor and crankshaft sensor I think.. and maybe the fuel pressure regulator..

But I read somewhere lastnight and I havent been able to find it again - that it could be a bad ground on the fuel tank/neck - WELL I just realized that I did have a dangling ground wire under there - so I took a pic.. I dont know where to re-attach the other end of this strap? Its got a chunk of rusted metal on it and I dont think I could re-attach it, so I might have to replace a part, but can;t figure out which one..

Any ideas on the rough idle - and if anyone could take a quick pic of their ground strap connected that would be great!! Is this dangerous ? Do you think it could cause the engine issues ?

[rg3918]

I forgot to mention - its a 5.7L , and here is a pic of the engine..

Another thought could be a vacuum leak? Im not sure how to check for one - a guy at autozone said to spray some carb cleaner around the engine to check for leaks, but what would I look for exactly?

[rg3918]

Just thought I would update - I tried seafoam - no change, and I checked the EGR valve - no problems there, also checked entire engine for vacuum leaks with carb cleaner - no leaks... hmmmmm ?

Also MAF Sensor appears to be sparkling clean... still rough at any speed mostly around 1500 rpm..

[Case 7230]

Running lean. My first thought would be fuel filter but you replaced that. Second thought would be weak fuel pump. Possibly because of no ground wire? Have you checked the fuel pressure?
Hopefully some of the EFI experts will give an opinion soon.

[rg3918]

I took some shots with my camera this morning to look for areas to reground - and to my surprise I think this kinked hose is not good! Looks like a bunch of hoses might need replacing.. this is not a job I feel safe doing.. do you agree that this might be the source of the poor idle and rough acceleration at every speed under 2k ?

[Case 7230]

The kinked hose looks like a tank breather, unlikely to be the cause of your problem.
I noticed you have a K&N air filter, these can sometimes contaminate the MAF sensor. Might be an idea to get a can of MAF sensor cleaner and give it a clean. Do not use compressed air.
Might also be worth doing a compression check.
Do you have a code reader, it would be nice to check the codes again. Even better if a scanner could be put on it.

[Crmzendrgone]

Did you install the fuel filter correctly I think they have only one way for flow.

[rg3918]

Fuel filter is installed correctly..
Mass Airflow is clear and looks good - K&N was installed after systems existed.. did lots of checks for vacuum leak to no avail.. going to replace an egr gasket now as the old one was crumbled and about half the thickness it should be - so it may be it..

I got a scan tool - Autel MS509 - recorded some data, not sure what to make of it, been learning and reading up on the data quite a bit.. but maybe theres something in there that is obvious to those with experience in repairing/working on chevy's..

Control Module
$10 SAE J1850 VPW
Vehicle Info.
Not Supported Or Sto-red No Data.
Since DTCs Cleared
MIL Status OFF
Misfire Monitor OK
Fuel System Mon OK
Comp. Component OK
Catalyst Mon N/A
Htd Catalyst N/A
Evap System Mon N/A
Sec Air System N/A
A/C Refrig Mon N/A
Oxygen Sens Mon OK
Oxygen Sens Htr OK
EGR System OK
Stored Codes
No codes are stored in the module!
Pending Codes
No pending codes are stored in the module!
View Freeze Frame
No Freeze Frame Data Stored!
O2 Monitor Test
O2 Bank1 Sensor1
Rich-Lean Threshd(V)
MOD : $10
MEAS: 0.480
MIN : -----
MAX : -----
Lean-Rich Threshd(V)
MOD : $10
MEAS: 0.480
MIN : -----
MAX : -----
Low for Switch(V)
MOD : $10
MEAS: 0.295
MIN : -----
MAX : -----
High for Switch(V)
MOD : $10
MEAS: 0.595
MIN : -----
MAX : -----
Rich-Lean Switch(s)
MOD : $10
MEAS: 0.032
MIN : 0.000
MAX : 0.092
Lean-Rich Switch(s)
MOD : $10
MEAS: 0.020
MIN : 0.000
MAX : 0.100
$70 (Counts)
MOD : $10
MEAS: 226
MIN : 50
MAX : 255
$71 (Values)
MOD : $10
MEAS: 219
MIN : 50
MAX : 255
$81 (Values)
MOD : $10
MEAS: 55
MIN : 19
MAX : 117
O2 Bank1 Sensor2
Not Supported Or Sto-red No Data.
O2 Bank2 Sensor1
Rich-Lean Threshd(V)
MOD : $10
MEAS: 0.480
MIN : -----
MAX : -----
Lean-Rich Threshd(V)
MOD : $10
MEAS: 0.480
MIN : -----
MAX : -----
Low for Switch(V)
MOD : $10
MEAS: 0.295
MIN : -----
MAX : -----
High for Switch(V)
MOD : $10
MEAS: 0.595
MIN : -----
MAX : -----
Rich-Lean Switch(s)
MOD : $10
MEAS: 0.032
MIN : 0.000
MAX : 0.092
Lean-Rich Switch(s)
MOD : $10
MEAS: 0.020
MIN : 0.000
MAX : 0.100
$70 (Counts)
MOD : $10
MEAS: 226
MIN : 50
MAX : 255
$71 (Values)
MOD : $10
MEAS: 219
MIN : 50
MAX : 255
$81 (Values)
MOD : $10
MEAS: 55
MIN : 19
MAX : 117
O2 Bank2 Sensor2
Not Supported Or Sto-red No Data.
On-Board Mon. Test
Test $06 Data
ID : 35
MOD : $10
MEAS: 2F
MAX : 44
MIN : -----
STS : OK
------------------
ID : 41
MOD : $10
MEAS: 25
MAX : CC
MIN : -----
STS : OK
------------------
ID : 55
MOD : $10
MEAS: 32
MAX : 44
MIN : -----
STS : OK
------------------
ID : 61
MOD : $10
MEAS: 19
MAX : CC
MIN : -----
STS : OK
------------------
Test $07 Data <---------- Cant find details about this anywhere!
ID : 0C
MOD : $10
MEAS: 8000
MAX : 0
MIN : -----
STS : Fail <---------- FAIL ??
------------------
ID : 0D
MOD : $10
MEAS: FC6F
MAX : C5
MIN : -----
STS : Fail <---------- FAIL ??
------------------

[rg3918]

Here is some live data I recorded after I had driven the truck for about an hour.. I took off heading up an incline, wide open throttle approaching 70mph.. Its funny - spending hours reading through the forum and so many people ask for people to scan and post data but no one appears to do so!! So I have some data - maybe someone else can post some data from there truck that is similiar ? 97 5.7L ? to compare ?

One suspicious item in here is the "O2B2S2(V)" seems to be quite low.. so I will check for bad grounds possibly...

Another item I'm curious about is the timing.., the SPARKADV reading from the scanner - can someone tell me what that is ? Is it the timing? Service manuals say the scanner should read timing at +/- 2' - but I cant find any reference to the SPARKADV ?

Can anyone tell me why one bank is --% on fuel trim and another is ++% on fuel trim ? I know there are lots of issues with these sequential injectors.. thinking about upgrading to MFI ...

Here is the data - all comments are welcome !! Its going to be a rainy weekend in CT - so its a good time for me to pull this thing into the barn and see if I can get it to run better !

Control Module
$10 SAE J1850 VPW
Live Data
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 3.5
ETC(°F) 189
SHRTFT1(%) 0.0
LONGFT1(%) -3.1
SHRTFT2(%) 3.9
LONGFT2(%) 10.9
MAP(inHg) 14.8
RPM(/min) 956
VSS(mph) 0
SPARKADV(°) 23
IAT(°F) 57
MAF(lb/min) 1.230
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.055
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.755
O2B2S1(V) 0.100
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.030
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 11.0
ETC(°F) 189
SHRTFT1(%) -0.8
LONGFT1(%) -2.3
SHRTFT2(%) 3.9
LONGFT2(%) 9.4
MAP(inHg) 17.1
RPM(/min) 1288
VSS(mph) 6
SPARKADV(°) 28
IAT(°F) 57
MAF(lb/min) 6.433
TP(%) 34.1
O2S B1S12--B2S12--
O2B1S1(V) 0.575
SHRTFTB1S1(%) -3.1
O2B1S2(V) 0.075
O2B2S1(V) 0.450
SHRTFTB2S1(%) 4.7
O2B2S2(V) 0.040
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 69.0
ETC(°F) 189
SHRTFT1(%) 3.1
LONGFT1(%) -0.8
SHRTFT2(%) 8.6
LONGFT2(%) 9.4
MAP(inHg) 28.4
RPM(/min) 3523
VSS(mph) 32
SPARKADV(°) 20
IAT(°F) 59
MAF(lb/min) 23.754
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.620
SHRTFTB1S1(%) 2.3
O2B1S2(V) 0.640
O2B2S1(V) 0.265
SHRTFTB2S1(%) 11.7
O2B2S2(V) 0.030
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 100.0
ETC(°F) 189
SHRTFT1(%) -0.8
LONGFT1(%) -0.8
SHRTFT2(%) 3.1
LONGFT2(%) 10.2
MAP(inHg) 28.6
RPM(/min) 3223
VSS(mph) 52
SPARKADV(°) 19
IAT(°F) 59
MAF(lb/min) 19.745
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.155
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.655
O2B2S1(V) 0.500
SHRTFTB2S1(%) 7.0
O2B2S2(V) 0.020
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 93.3
ETC(°F) 192
SHRTFT1(%) 2.3
LONGFT1(%) -0.8
SHRTFT2(%) 14.1
LONGFT2(%) 10.2
MAP(inHg) 28.4
RPM(/min) 3932
VSS(mph) 63
SPARKADV(°) 16
IAT(°F) 57
MAF(lb/min) 26.057
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.705
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.605
O2B2S1(V) 0.145
SHRTFTB2S1(%) 10.9
O2B2S2(V) 0.050
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 9.8
ETC(°F) 194
SHRTFT1(%) -0.8
LONGFT1(%) -4.7
SHRTFT2(%) 2.3
LONGFT2(%) 9.4
MAP(inHg) 14.2
RPM(/min) 2082 ----Slowing Down here ----
VSS(mph) 66
SPARKADV(°) 39
IAT(°F) 57
MAF(lb/min) 4.357
TP(%) 9.0
O2S B1S12--B2S12--
O2B1S1(V) 0.080
SHRTFTB1S1(%) -3.1
O2B1S2(V) 0.735
O2B2S1(V) 0.110
SHRTFTB2S1(%) 7.8
O2B2S2(V) 0.070
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 29.4
ETC(°F) 198
SHRTFT1(%) -1.6
LONGFT1(%) 0.0
SHRTFT2(%) 10.9
LONGFT2(%) 10.2
MAP(inHg) 27.8
RPM(/min) 1913
VSS(mph) 60
SPARKADV(°) 20
IAT(°F) 54
MAF(lb/min) 9.874
TP(%) 47.8
O2S B1S12--B2S12--
O2B1S1(V) 0.770
SHRTFTB1S1(%) -2.3
O2B1S2(V) 0.645
O2B2S1(V) 0.855
SHRTFTB2S1(%) 8.6
O2B2S2(V) 0.070
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 90.6
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 28.1
RPM(/min) 4062
VSS(mph) 61
SPARKADV(°) 21
IAT(°F) 54
MAF(lb/min) 24.097
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.895
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.880
O2B2S1(V) 0.775
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.085
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 100.0
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 28.1
RPM(/min) 4330
VSS(mph) 69
SPARKADV(°) 35
IAT(°F) 54
MAF(lb/min) 2.985
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.875
SHRTFTB1S1(%) -0.8
O2B1S2(V) 0.875
O2B2S1(V) 0.665
SHRTFTB2S1(%) -0.8
O2B2S2(V) 0.420
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 25.1
ETC(°F) 198
SHRTFT1(%) -3.9
LONGFT1(%) -1.6
SHRTFT2(%) 9.4
LONGFT2(%) 9.4
MAP(inHg) 19.2
RPM(/min) 1887
VSS(mph) 60
SPARKADV(°) 34
IAT(°F) 54
MAF(lb/min) 2.775
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.060
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.760
O2B2S1(V) 0.725
SHRTFTB2S1(%) 4.7
O2B2S2(V) 0.060
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 25.1
ETC(°F) 198
SHRTFT1(%) -3.1
LONGFT1(%) -1.6
SHRTFT2(%) 10.2
LONGFT2(%) 9.4
MAP(inHg) 21.0
RPM(/min) 1715
VSS(mph) 53
SPARKADV(°) 25
IAT(°F) 54
MAF(lb/min) 9.314
TP(%) 52.9
O2S B1S12--B2S12--
O2B1S1(V) 0.190
SHRTFTB1S1(%) -2.3
O2B1S2(V) 0.680
O2B2S1(V) 0.785
SHRTFTB2S1(%) 7.8
O2B2S2(V) 0.050
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 9.0
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) -7.0
SHRTFT2(%) 1.6
LONGFT2(%) 10.9
MAP(inHg) 7.1
RPM(/min) 1704
VSS(mph) 53
SPARKADV(°) 28
IAT(°F) 54
MAF(lb/min) 1.972
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.040
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.710
O2B2S1(V) 0.205
SHRTFTB2S1(%) 3.9
O2B2S2(V) 0.055
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 8.2
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) -7.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.9
MAP(inHg) 8.3
RPM(/min) 1606
VSS(mph) 50
SPARKADV(°) -10
IAT(°F) 54
MAF(lb/min) 2.159
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.000
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.000
O2B2S1(V) 0.225
SHRTFTB2S1(%) 3.9
O2B2S2(V) 0.040
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 7.1
ETC(°F) 198
SHRTFT1(%) 1.6
LONGFT1(%) -7.0
SHRTFT2(%) 0.0
LONGFT2(%) 9.4
MAP(inHg) 7.1
RPM(/min) 1660
VSS(mph) 52
SPARKADV(°) 28
IAT(°F) 54
MAF(lb/min) 1.911
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.120
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.075
O2B2S1(V) 0.735
SHRTFTB2S1(%) 4.7
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 8.2
ETC(°F) 198
SHRTFT1(%) 0.0
LONGFT1(%) -6.3
SHRTFT2(%) 0.0
LONGFT2(%) 9.4
MAP(inHg) 8.3
RPM(/min) 1689
VSS(mph) 53
SPARKADV(°) -10
IAT(°F) 54
MAF(lb/min) 5.041
TP(%) 19.2
O2S B1S12--B2S12--
O2B1S1(V) 0.825
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.060
O2B2S1(V) 0.095
SHRTFTB2S1(%) 8.6
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 99.2
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 28.4
RPM(/min) 4148
VSS(mph) 63
SPARKADV(°) 21
IAT(°F) 54
MAF(lb/min) 26.529
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.895
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.890
O2B2S1(V) 0.755
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.090
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 9.8
ETC(°F) 194
SHRTFT1(%) -3.1
LONGFT1(%) -7.0
SHRTFT2(%) 0.8
LONGFT2(%) 10.9
MAP(inHg) 8.6
RPM(/min) 2087
VSS(mph) 66
SPARKADV(°) 29
IAT(°F) 54
MAF(lb/min) 2.163
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.675
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.775
O2B2S1(V) 0.755
SHRTFTB2S1(%) 2.3
O2B2S2(V) 0.060
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 43.9
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) -0.8
SHRTFT2(%) 7.8
LONGFT2(%) 10.2
MAP(inHg) 28.6
RPM(/min) 1923
VSS(mph) 61
SPARKADV(°) 19
IAT(°F) 54
MAF(lb/min) 16.618
TP(%) 76.1
O2S B1S12--B2S12--
O2B1S1(V) 0.855
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.875
O2B2S1(V) 0.865
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.130
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 94.1
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 28.1
RPM(/min) 4237
VSS(mph) 65
SPARKADV(°) 20
IAT(°F) 52
MAF(lb/min) 27.031
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.890
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.885
O2B2S1(V) 0.135
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 96.5
ETC(°F) 198
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 27.8
RPM(/min) 4448
VSS(mph) 71
SPARKADV(°) 34
IAT(°F) 48
MAF(lb/min) 6.340
TP(%) 21.2
O2S B1S12--B2S12--
O2B1S1(V) 0.190
SHRTFTB1S1(%) -3.9
O2B1S2(V) 0.760
O2B2S1(V) 0.150
SHRTFTB2S1(%) 7.8
O2B2S2(V) 0.050
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 71.8
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 28.1
RPM(/min) 3171
VSS(mph) 68
SPARKADV(°) 24
IAT(°F) 52
MAF(lb/min) 18.904
TP(%) 80.4
O2S B1S12--B2S12--
O2B1S1(V) 0.880
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.885
O2B2S1(V) 0.070
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.070
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 69.0
ETC(°F) 199
SHRTFT1(%) -3.1
LONGFT1(%) -0.8
SHRTFT2(%) 7.0
LONGFT2(%) 9.4
MAP(inHg) 21.9
RPM(/min) 3024
VSS(mph) 68
SPARKADV(°) 37
IAT(°F) 48
MAF(lb/min) 8.269
TP(%) 29.4
O2S B1S12--B2S12--
O2B1S1(V) 0.655
SHRTFTB1S1(%) -3.1
O2B1S2(V) 0.710
O2B2S1(V) 0.700
SHRTFTB2S1(%) 12.5
O2B2S2(V) 0.055
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 27.8
ETC(°F) 199
SHRTFT1(%) -1.6
LONGFT1(%) -2.3
SHRTFT2(%) 10.2
LONGFT2(%) 10.2
MAP(inHg) 22.2
RPM(/min) 1935
VSS(mph) 62
SPARKADV(°) 28
IAT(°F) 52
MAF(lb/min) 8.204
TP(%) 33.3
O2S B1S12--B2S12--
O2B1S1(V) 0.065
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.670
O2B2S1(V) 0.020
SHRTFTB2S1(%) 10.2
O2B2S2(V) 0.060
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 40.4
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 10.2
MAP(inHg) 28.4
RPM(/min) 2833
VSS(mph) 58
SPARKADV(°) 24
IAT(°F) 48
MAF(lb/min) 23.813
TP(%) 90.2
O2S B1S12--B2S12--
O2B1S1(V) 0.875
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.880
O2B2S1(V) 0.790
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.040
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 46.3
ETC(°F) 198
SHRTFT1(%) -3.9
LONGFT1(%) -1.6
SHRTFT2(%) 8.6
LONGFT2(%) 9.4
MAP(inHg) 24.5
RPM(/min) 2566
VSS(mph) 61
SPARKADV(°) 25
IAT(°F) 48
MAF(lb/min) 14.072
TP(%) 63.1
O2S B1S12--B2S12--
O2B1S1(V) 0.760
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.560
O2B2S1(V) 0.080
SHRTFTB2S1(%) 14.1
O2B2S2(V) 0.130
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 35.3
ETC(°F) 198
SHRTFT1(%) -2.3
LONGFT1(%) -1.6
SHRTFT2(%) 8.6
LONGFT2(%) 10.9
MAP(inHg) 20.1
RPM(/min) 1876
VSS(mph) 59
SPARKADV(°) 33
IAT(°F) 48
MAF(lb/min) 6.597
TP(%) 26.3
O2S B1S12--B2S12--
O2B1S1(V) 0.730
SHRTFTB1S1(%) -2.3
O2B1S2(V) 0.495
O2B2S1(V) 0.030
SHRTFTB2S1(%) 10.2
O2B2S2(V) 0.090
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 28.2
ETC(°F) 198
SHRTFT1(%) 0.0
LONGFT1(%) -2.3
SHRTFT2(%) 10.2
LONGFT2(%) 11.7
MAP(inHg) 24.5
RPM(/min) 1778
VSS(mph) 55
SPARKADV(°) 22
IAT(°F) 48
MAF(lb/min) 8.572
TP(%) 42.4
O2S B1S12--B2S12--
O2B1S1(V) 0.780
SHRTFTB1S1(%) -2.3
O2B1S2(V) 0.460
O2B2S1(V) 0.030
SHRTFTB2S1(%) 9.4
O2B2S2(V) 0.095
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 24.3
ETC(°F) 199
SHRTFT1(%) -0.8
LONGFT1(%) -2.3
SHRTFT2(%) 9.4
LONGFT2(%) 12.5
MAP(inHg) 16.5
RPM(/min) 1727
VSS(mph) 54
SPARKADV(°) 35
IAT(°F) 48
MAF(lb/min) 5.140
TP(%) 14.5
O2S B1S12--B2S12--
O2B1S1(V) 0.745
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.430
O2B2S1(V) 0.605
SHRTFTB2S1(%) 7.8
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 36.9
ETC(°F) 199
SHRTFT1(%) 0.0
LONGFT1(%) -0.8
SHRTFT2(%) 1.6
LONGFT2(%) 11.7
MAP(inHg) 27.2
RPM(/min) 2649
VSS(mph) 55
SPARKADV(°) 20
IAT(°F) 48
MAF(lb/min) 14.704
TP(%) 59.2
O2S B1S12--B2S12--
O2B1S1(V) 0.080
SHRTFTB1S1(%) -0.8
O2B1S2(V) 0.440
O2B2S1(V) 0.825
SHRTFTB2S1(%) 9.4
O2B2S2(V) 0.085
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 43.9
ETC(°F) 199
SHRTFT1(%) -2.3
LONGFT1(%) -0.8
SHRTFT2(%) 7.8
LONGFT2(%) 13.3
MAP(inHg) 22.7
RPM(/min) 2439
VSS(mph) 58
SPARKADV(°) 32
IAT(°F) 48
MAF(lb/min) 10.569
TP(%) 38.8
O2S B1S12--B2S12--
O2B1S1(V) 0.395
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.600
O2B2S1(V) 0.740
SHRTFTB2S1(%) 8.6
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 27.8
ETC(°F) 194
SHRTFT1(%) -1.6
LONGFT1(%) -2.3
SHRTFT2(%) 12.5
LONGFT2(%) 13.3
MAP(inHg) 18.9
RPM(/min) 1814
VSS(mph) 57
SPARKADV(°) 33
IAT(°F) 48
MAF(lb/min) 6.331
TP(%) 23.9
O2S B1S12--B2S12--
O2B1S1(V) 0.765
SHRTFTB1S1(%) -0.8
O2B1S2(V) 0.230
O2B2S1(V) 0.145
SHRTFTB2S1(%) 10.9
O2B2S2(V) 0.100
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 34.9
ETC(°F) 194
SHRTFT1(%) 0.8
LONGFT1(%) -0.8
SHRTFT2(%) 10.2
LONGFT2(%) 11.7
MAP(inHg) 26.0
RPM(/min) 1800
VSS(mph) 57
SPARKADV(°) 19
IAT(°F) 48
MAF(lb/min) 8.737
TP(%) 40.0
O2S B1S12--B2S12--
O2B1S1(V) 0.750
SHRTFTB1S1(%) -1.6
O2B1S2(V) 0.610
O2B2S1(V) 0.750
SHRTFTB2S1(%) 10.2
O2B2S2(V) 0.095
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 12.9
ETC(°F) 194
SHRTFT1(%) -3.1
LONGFT1(%) -7.0
SHRTFT2(%) 6.3
LONGFT2(%) 11.7
MAP(inHg) 13.0
RPM(/min) 1697
VSS(mph) 53
SPARKADV(°) 29
IAT(°F) 48
MAF(lb/min) 7.110
TP(%) 31.8
O2S B1S12--B2S12--
O2B1S1(V) 0.065
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.485
O2B2S1(V) 0.745
SHRTFTB2S1(%) 7.0
O2B2S2(V) 0.085
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 22.4
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) -2.3
SHRTFT2(%) 5.5
LONGFT2(%) 16.4
MAP(inHg) 18.0
RPM(/min) 1614
VSS(mph) 50
SPARKADV(°) 28
IAT(°F) 48
MAF(lb/min) 6.908
TP(%) 31.4
O2S B1S12--B2S12--
O2B1S1(V) 0.785
SHRTFTB1S1(%) -0.8
O2B1S2(V) 0.590
O2B2S1(V) 0.710
SHRTFTB2S1(%) 3.1
O2B2S2(V) 0.045
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 56.9
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 13.3
MAP(inHg) 27.8
RPM(/min) 3588
VSS(mph) 53
SPARKADV(°) 24
IAT(°F) 48
MAF(lb/min) 21.286
TP(%) 100.0
O2S B1S12--B2S12--
O2B1S1(V) 0.890
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.875
O2B2S1(V) 0.825
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.510
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 OL
FUELSYS2 OL
LOAD_PCT(%) 93.3
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) 0.0
SHRTFT2(%) 0.0
LONGFT2(%) 13.3
MAP(inHg) 27.8
RPM(/min) 4079
VSS(mph) 65
SPARKADV(°) 24
IAT(°F) 48
MAF(lb/min) 17.912
TP(%) 40.0
O2S B1S12--B2S12--
O2B1S1(V) 0.820
SHRTFTB1S1(%) -5.5
O2B1S2(V) 0.815
O2B2S1(V) 0.355
SHRTFTB2S1(%) 1.6
O2B2S2(V) 0.075
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 7.8
ETC(°F) 194
SHRTFT1(%) -2.3
LONGFT1(%) -6.3
SHRTFT2(%) 3.9
LONGFT2(%) 10.2
MAP(inHg) 6.8
RPM(/min) 1909
VSS(mph) 60
SPARKADV(°) 28
IAT(°F) 48
MAF(lb/min) 2.007
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.750
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.740
O2B2S1(V) 0.010
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.050
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 27.8
ETC(°F) 194
SHRTFT1(%) -2.3
LONGFT1(%) -3.1
SHRTFT2(%) 2.3
LONGFT2(%) 17.2
MAP(inHg) 22.7
RPM(/min) 1800
VSS(mph) 57
SPARKADV(°) 25
IAT(°F) 48
MAF(lb/min) 2.672
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.055
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.690
O2B2S1(V) 0.430
SHRTFTB2S1(%) 4.7
O2B2S2(V) 0.060
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 25.5
ETC(°F) 198
SHRTFT1(%) -1.6
LONGFT1(%) -3.1
SHRTFT2(%) 5.5
LONGFT2(%) 18.0
MAP(inHg) 22.7
RPM(/min) 1666
VSS(mph) 53
SPARKADV(°) 30
IAT(°F) 48
MAF(lb/min) 1.950
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.790
SHRTFTB1S1(%) 1.6
O2B1S2(V) 0.660
O2B2S1(V) 0.560
SHRTFTB2S1(%) 4.7
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 26.3
ETC(°F) 199
SHRTFT1(%) 0.8
LONGFT1(%) -3.1
SHRTFT2(%) 0.0
LONGFT2(%) 12.5
MAP(inHg) 8.3
RPM(/min) 1630
VSS(mph) 52
SPARKADV(°) 27
IAT(°F) 48
MAF(lb/min) 1.820
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.780
SHRTFTB1S1(%) 0.8
O2B1S2(V) 0.655
O2B2S1(V) 0.295
SHRTFTB2S1(%) 4.7
O2B2S2(V) 0.080
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 21.2
ETC(°F) 198
SHRTFT1(%) -1.6
LONGFT1(%) -3.1
SHRTFT2(%) 2.3
LONGFT2(%) 18.0
MAP(inHg) 16.8
RPM(/min) 1625
VSS(mph) 51
SPARKADV(°) 38
IAT(°F) 48
MAF(lb/min) 3.148
TP(%) 5.9
O2S B1S12--B2S12--
O2B1S1(V) 0.740
SHRTFTB1S1(%) 2.3
O2B1S2(V) 0.630
O2B2S1(V) 0.450
SHRTFTB2S1(%) 7.8
O2B2S2(V) 0.065
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 7.1
ETC(°F) 198
SHRTFT1(%) 0.0
LONGFT1(%) -7.8
SHRTFT2(%) 3.9
LONGFT2(%) 14.1
MAP(inHg) 11.5
RPM(/min) 1601
VSS(mph) 51
SPARKADV(°) 28
IAT(°F) 48
MAF(lb/min) 4.042
TP(%) 8.2
O2S B1S12--B2S12--
O2B1S1(V) 0.130
SHRTFTB1S1(%) -3.1
O2B1S2(V) 0.645
O2B2S1(V) 0.070
SHRTFTB2S1(%) 2.3
O2B2S2(V) 0.060
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 45.9
ETC(°F) 194
SHRTFT1(%) -0.8
LONGFT1(%) -0.8
SHRTFT2(%) 2.3
LONGFT2(%) 13.3
MAP(inHg) 21.9
RPM(/min) 2628
VSS(mph) 57
SPARKADV(°) 36
IAT(°F) 48
MAF(lb/min) 9.331
TP(%) 34.1
O2S B1S12--B2S12--
O2B1S1(V) 0.315
SHRTFTB1S1(%) -0.8
O2B1S2(V) 0.505
O2B2S1(V) 0.790
SHRTFTB2S1(%) 7.8
O2B2S2(V) 0.045
OBD Not OBD
------------------
DTC_CNT 0
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT(%) 8.6
ETC(°F) 194
SHRTFT1(%) 0.0
LONGFT1(%) -7.0
SHRTFT2(%) 0.8
LONGFT2(%) 10.2
MAP(inHg) 6.8
RPM(/min) 1890
VSS(mph) 60
SPARKADV(°) 28
IAT(°F) 48
MAF(lb/min) 2.034
TP(%) 0.0
O2S B1S12--B2S12--
O2B1S1(V) 0.315
SHRTFTB1S1(%) 0.0
O2B1S2(V) 0.525
O2B2S1(V) 0.530
SHRTFTB2S1(%) 0.0
O2B2S2(V) 0.065
OBD Not OBD
------------------

[mudseeker]

bank 2 sensor 2 is your post cat sensor. i would have to see the pre and post on a graph to have any idea on what is going on with it. it should be close to a flat line if your cat is working properly.

as for your banks of the engine being different, it could be anything. lazy o2 sensor, injectors, valves, you name it. all that data is nice, but i'm used to looking at it on the scanner. maybe NCRoadracer will chime in on the scanner data.

almost forgot, the spark advance will change as you're driving. the more you're into the gas the more advanced your timing will be and vice versa(computer controlled). parked at 2000rpm your CAM RETARD should be at 0*+-

i'll try to dig up some screen shots from my truck one of these days for ya.