Smoking!!!!!!

GENE · 01-07-2007, 04:28 AM

I own a 1991 C-1500 with a 5.7.When I start it up it does not seem to have a high idle,also after it warms up it continues to belch BLACK smoke out the exhaust.It seems to be running rich.It has a TBI unit on it.Any HELP would be greatly appreciated.

Chevy808 · 01-07-2007, 09:16 PM

Quote:

Originally Posted by GENE

I own a 1991 C-1500 with a 5.7.When I start it up it does not seem to have a high idle,also after it warms up it continues to belch BLACK smoke out the exhaust.It seems to be running rich.It has a TBI unit on it.Any HELP would be greatly appreciated.

Did it throw a code??

03chevy · 01-08-2007, 07:36 AM

have you ran some tbi cleaner in it? all that black smoke is carbon build up and it needs to be cleaned

Chevy808 · 01-08-2007, 01:31 PM

Quote:

Originally Posted by 03chevy

have you ran some tbi cleaner in it? all that black smoke is carbon build up and it needs to be cleaned

Not always....sometimes they're signs of worned rings.

mrjohnwayne · 01-08-2007, 01:36 PM

if it were blowby it should be blue/white smoke. Black smoke is more fuel related.

flyinhillbilly · 01-08-2007, 06:28 PM

Quote:

Originally Posted by mrjohnwayne

if it were blowby it should be blue/white smoke. Black smoke is more fuel related.

X2, black smoke is fuel, i'd check the coolant temp sensor first, mine was bad for a long time on my 94k2500 and i didn't even know it untill i hooked up my megasquirt and saw it reading -40 on the data display. , if that don't work, try the map sensor and check the fuel pressure.

791ton · 01-09-2007, 08:50 PM

how long has it been since the oxygen sensor has been done? If im not mistaken, those usually have about a 30k mile life span. And if it goes out and gets stuck in a lean condition, it will tell the computer to dump more gas.

flyinhillbilly · 01-10-2007, 09:01 PM

most of the time a narrow band o2 sensor will stick center when they poop

791ton · 01-10-2007, 10:05 PM

i sit corrected

03chevy · 01-11-2007, 06:53 AM

i agree with everybody else change the o2

01-07-2007, 04:28 AM	#1
GENE Junior Member Join Date: Nov 2006 Posts: 2	Smoking!!!!!! I own a 1991 C-1500 with a 5.7.When I start it up it does not seem to have a high idle,also after it warms up it continues to belch BLACK smoke out the exhaust.It seems to be running rich.It has a TBI unit on it.Any HELP would be greatly appreciated.

01-08-2007, 01:36 PM	#5
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,221	if it were blowby it should be blue/white smoke. Black smoke is more fuel related. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

01-09-2007, 08:50 PM	#7
791ton Senior Member Join Date: Dec 2006 Location: Bremerton, Washington Posts: 64	how long has it been since the oxygen sensor has been done? If im not mistaken, those usually have about a 30k mile life span. And if it goes out and gets stuck in a lean condition, it will tell the computer to dump more gas. __________________ 1979 Crew Cab Chevy 1 Ton Dually 454

01-10-2007, 10:05 PM	#9
791ton Senior Member Join Date: Dec 2006 Location: Bremerton, Washington Posts: 64	i sit corrected __________________ 1979 Crew Cab Chevy 1 Ton Dually 454

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

01-08-2007, 07:36 AM	#3
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 1,063	have you ran some tbi cleaner in it? all that black smoke is carbon build up and it needs to be cleaned

01-10-2007, 09:01 PM	#8
flyinhillbilly Full Member Join Date: Jan 2007 Posts: 14	most of the time a narrow band o2 sensor will stick center when they poop

01-11-2007, 06:53 AM	#10
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 1,063	i agree with everybody else change the o2

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Legislators change the ban on smoking to exempt truck stops (Bismarck Tribune)	trucknews	Truck News (headlines)	0	04-07-2005 03:30 AM