1996 5.7 vortec/auto transmission jerky shift

pearsont74 · 11-03-2009, 07:48 PM

ok...onto my next item on this newly adquired truck.
i have noticed when i drivethe shifting is abit of a jerk....doesnt feel grindin and i dont hear anything.
so...im thinkin of takin it to a tranmission place..and have it checked out
anythoughts?

pearsont74 · 11-04-2009, 02:47 PM

anyone? i plan to check the fluid tonight when i get home. was reading some info on this and read that if the fluid is red/brown and somewhat runny and clear that the fluid is good and its not grinding, oh..and if theres no burn smell...
anyone? the kid that i got this truck form said "supposely" the tranmission was rebuild bout 15000 miles ago

Crmzendrgone · 11-04-2009, 05:07 PM

What gears do you feel the jerk in?

pearsont74 · 11-04-2009, 05:58 PM

all of of them lol

bradrhale · 11-05-2009, 07:56 PM

is it a late shift?? shift great except gives you whiplash when goes into the next gear?? shifts at high RPM?? idle a little high?? if yes to all of these, characteristic of a malfunctioning TPS.

pearsont74 · 11-06-2009, 06:10 AM

what is TPS? yes to all....not a ruff whiplash...but noticible and it does feel like its abit late. the idle seems fine but when li let off the brake...at times the idle drops way low like it bout to cut off...i have to press down on the gas to get goin....squealed my wheels last nite lol

bradrhale · 11-06-2009, 06:55 AM

throttle positioning sensor. you really have to give it more gas when moving from gear to gear in an auto otherwise, it seems like it doesnt want to shift. because of this, it shifts in a high RPM creating an extremely hard shift. this however will not cause poor idle. it might if the IAC was south, though.

pearsont74 · 11-06-2009, 07:20 AM

anyone have a pics refer of these items on this engine

any way i can test this? i hate to take it to a tranmission shop for them to replace a sensor that cheap and easy when i can do it but i also hate to get a new one..and it not fix the prob...

Crmzendrgone · 11-06-2009, 08:25 AM

Here you go. This should be what your Throttle Body looks like when you have remove the coverings and the duct work.

Found this 411.

Throttle Position (TP) sensor
Like the older engines, the TP (or TPS) is mounted on the throttle body throttle shaft. The sensor is a potentiometer that varies the voltage output based on position (in this case, the angle of the throttle blade). At idle, the output voltage is around 0.6V, and at WOT this voltage is around 4.0V. The pcm sees the signal, along with the CMP, CKP, MAP and MAF to determine if the engine is accelerating or not. This affects many systems, including emission system and fuel calibration control. An erratic or faulty TP sensor will cause erratic engine performance. A DTC will be set depending on the type of fault condition the pcm sees.

pearsont74 · 11-06-2009, 08:42 AM

assume this is on top right where the air hose connects...are there gaskets or seals i should get if i remove this to clean?

11-03-2009, 07:48 PM	#1
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	1996 5.7 vortec/auto transmission jerky shift ok...onto my next item on this newly adquired truck. i have noticed when i drivethe shifting is abit of a jerk....doesnt feel grindin and i dont hear anything. so...im thinkin of takin it to a tranmission place..and have it checked out anythoughts?

11-04-2009, 05:07 PM	#3
Crmzendrgone Senior Member Join Date: Apr 2009 Location: Arizona Posts: 1,413	What gears do you feel the jerk in? __________________ ENGINES PRODUCE POWER. MOTORS RECEIVE POWER. https://lastroundbestround.com/Home_Page.html

11-06-2009, 08:25 AM	#9
Crmzendrgone Senior Member Join Date: Apr 2009 Location: Arizona Posts: 1,413	Here you go. This should be what your Throttle Body looks like when you have remove the coverings and the duct work. Found this 411. Throttle Position (TP) sensor Like the older engines, the TP (or TPS) is mounted on the throttle body throttle shaft. The sensor is a potentiometer that varies the voltage output based on position (in this case, the angle of the throttle blade). At idle, the output voltage is around 0.6V, and at WOT this voltage is around 4.0V. The pcm sees the signal, along with the CMP, CKP, MAP and MAF to determine if the engine is accelerating or not. This affects many systems, including emission system and fuel calibration control. An erratic or faulty TP sensor will cause erratic engine performance. A DTC will be set depending on the type of fault condition the pcm sees. Attached Thumbnails __________________ ENGINES PRODUCE POWER. MOTORS RECEIVE POWER. https://lastroundbestround.com/Home_Page.html

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
1996 vortec 305 missfire	Buroaktree	GMC Truck Forum	11	06-02-2009 01:52 PM
1996 vortec 305 to a 350	jessie_london	Chevy Truck Forum	6	02-03-2009 08:57 PM
1996 5.0 vortec 300 misfire code	dwill80	Chevy Truck Forum	1	04-28-2008 05:03 PM
auto transmission won't shift and rpm& speed guages don't work	gmcer	GMC Truck Forum	13	05-04-2006 08:27 AM
1996 Auto transmission question	Blueoval	Ford Truck Forum	0	09-18-2004 01:24 PM

11-04-2009, 02:47 PM	#2
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	anyone? i plan to check the fluid tonight when i get home. was reading some info on this and read that if the fluid is red/brown and somewhat runny and clear that the fluid is good and its not grinding, oh..and if theres no burn smell... anyone? the kid that i got this truck form said "supposely" the tranmission was rebuild bout 15000 miles ago

11-04-2009, 05:58 PM	#4
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	all of of them lol

11-05-2009, 07:56 PM	#5
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,003	is it a late shift?? shift great except gives you whiplash when goes into the next gear?? shifts at high RPM?? idle a little high?? if yes to all of these, characteristic of a malfunctioning TPS.

11-06-2009, 06:10 AM	#6
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	what is TPS? yes to all....not a ruff whiplash...but noticible and it does feel like its abit late. the idle seems fine but when li let off the brake...at times the idle drops way low like it bout to cut off...i have to press down on the gas to get goin....squealed my wheels last nite lol

11-06-2009, 06:55 AM	#7
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,003	throttle positioning sensor. you really have to give it more gas when moving from gear to gear in an auto otherwise, it seems like it doesnt want to shift. because of this, it shifts in a high RPM creating an extremely hard shift. this however will not cause poor idle. it might if the IAC was south, though.

11-06-2009, 07:20 AM	#8
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	anyone have a pics refer of these items on this engine any way i can test this? i hate to take it to a tranmission shop for them to replace a sensor that cheap and easy when i can do it but i also hate to get a new one..and it not fix the prob...

11-06-2009, 08:42 AM	#10
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	assume this is on top right where the air hose connects...are there gaskets or seals i should get if i remove this to clean?