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Chevy S10 - GMC S15 and Sonoma Exhaust problems

12 messages,  Last post on Aug 13, 2011 at 8:11 AM

You are in the Chevrolet S-10 & GMC S15 Sonoma Forum.

What is this discussion about? Chevrolet S-10, GMC Sonoma, Exhaust, Truck

Messages Page 2 of 2

#3 of 12 black smut at tail pipe at first crank in am by jstancil

Jul 07, 2009 (4:36 am)

96 sonoma with 245000 miles with black smut at tail pipe each morning when first cranked up. Engines run good until gets hot then sputters a little but still runs with small amount of lean black smoke out tail pipe. Converter ok, new plugs and wires, Compression great with no leak downs,02 sensor new. fuel filter new. Could this be a Throttle body sensor problem? Andy advice?

#4 of 12 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo

Jul 07, 2009 (8:00 am)

Replying to: jstancil (Jul 07, 2009 4:36 am)
2,2 or 4.3 engine?

#5 of 12 Re: black smut at tail pipe at first crank in am [gonogo] by jstancil

Jul 07, 2009 (8:07 am)

Replying to: gonogo (Jul 07, 2009 8:00 am)
2.2

#6 of 12 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo

Jul 08, 2009 (7:05 am)

Replying to: jstancil (Jul 07, 2009 8:07 am)
Remove the vacuum hose of the fuel regulator, if you see or smell fuel replace it.

#7 of 12 Re: black smut at tail pipe at first crank in am [gonogo] by jstancil

Jul 08, 2009 (12:01 pm)

Replying to: gonogo (Jul 08, 2009 7:05 am)
Fuel regulator ok did not see or smell gas from the regulator. map sensor and throttle position sensor replaced also.Could this be a vacuum leak problem, maybe when vaccume hose gets hot it expands and leaks?

#8 of 12 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo

Jul 09, 2009 (8:11 am)

Replying to: jstancil (Jul 08, 2009 12:01 pm)
I am leaning toward bad injector, when plugs are pulled are all sooted or just one.

#9 of 12 Re: black smut at tail pipe at first crank in am [gonogo] by jstancil

Jul 10, 2009 (9:17 am)

Replying to: gonogo (Jul 09, 2009 8:11 am)
Yes me to although I did a fuel injection service at a shop, this is where the send the injection cleaner directly through the carb. When I replaced the plugs as I remember there was 1 plug that did look a little smutty. Is there a way of pressure blowing out the injectors and is this expensive, Can a injector expand with heat and cause problems when it gets hot. Does and injector usually get stopped up or does it just go bad on most vehicles . If so with this many miles I may just drive it until is stops then put a lower millage motor in it.

#10 of 12 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo

Jul 11, 2009 (6:34 am)

Replying to: jstancil (Jul 10, 2009 9:17 am)
Excess fuel will run good with a cold engine, not so good hot. I would say the sooty plug has the bad injector.

#11 of 12 Chevy s10 exhaust pipe gets red hot by vrzonca

Aug 12, 2011 (4:44 pm)

Truck started normally, ran ok for a bit, stared running rough, check engine light came on,after driving a bit farther, stopped, looked under the truck, seemed a little loud, and noticed the exhaust pipe from manifold was glowing red hot. What's up? Running rich? running lean? clogged converter?

#12 of 12 Re: Chevy s10 exhaust pipe gets red hot [vrzonca] by gonogo

Aug 13, 2011 (8:11 am)

Replying to: vrzonca (Aug 12, 2011 4:44 pm)
Have the converter checked out, can be done with a vacuum or pressure gauge.

Messages Page 2 of 2

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