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Chevy S10 - GMC S15 and Sonoma Exhaust problems

10 messages,  Last post on Jul 11, 2009 at 5:34 AM

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#3 of 10 black smut at tail pipe at first crank in am by jstancil Jul 07, 2009 (3:36 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? Replies to this message: gonogo (Jul 07, 2009 7:00 am) jstancil (Jul 07, 2009 7:07 am) gonogo (Jul 08, 2009 6:05 am) and 4 more...
#4 of 10 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo Jul 07, 2009 (7:00 am)
Replying to: jstancil (Jul 07, 2009 3:36 am) 2,2 or 4.3 engine? Replies to this message: jstancil (Jul 07, 2009 7:07 am) gonogo (Jul 08, 2009 6:05 am) jstancil (Jul 08, 2009 11:01 am) and 3 more...
#5 of 10 Re: black smut at tail pipe at first crank in am [gonogo] by jstancil Jul 07, 2009 (7:07 am)
Replying to: gonogo (Jul 07, 2009 7:00 am) 2.2 Replies to this message: gonogo (Jul 08, 2009 6:05 am) jstancil (Jul 08, 2009 11:01 am) gonogo (Jul 09, 2009 7:11 am) and 2 more...
#6 of 10 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo Jul 08, 2009 (6:05 am)
Replying to: jstancil (Jul 07, 2009 7:07 am) Remove the vacuum hose of the fuel regulator, if you see or smell fuel replace it. Replies to this message: jstancil (Jul 08, 2009 11:01 am) gonogo (Jul 09, 2009 7:11 am) jstancil (Jul 10, 2009 8:17 am) and 1 more...
#7 of 10 Re: black smut at tail pipe at first crank in am [gonogo] by jstancil Jul 08, 2009 (11:01 am)
Replying to: gonogo (Jul 08, 2009 6:05 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? Replies to this message: gonogo (Jul 09, 2009 7:11 am) jstancil (Jul 10, 2009 8:17 am) gonogo (Jul 11, 2009 5:34 am)
#8 of 10 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo Jul 09, 2009 (7:11 am)
Replying to: jstancil (Jul 08, 2009 11:01 am) I am leaning toward bad injector, when plugs are pulled are all sooted or just one. Replies to this message: jstancil (Jul 10, 2009 8:17 am) gonogo (Jul 11, 2009 5:34 am)
#9 of 10 Re: black smut at tail pipe at first crank in am [gonogo] by jstancil Jul 10, 2009 (8:17 am)
Replying to: gonogo (Jul 09, 2009 7:11 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. Replies to this message: gonogo (Jul 11, 2009 5:34 am)
#10 of 10 Re: black smut at tail pipe at first crank in am [jstancil] by gonogo Jul 11, 2009 (5:34 am)
Replying to: jstancil (Jul 10, 2009 8:17 am) Excess fuel will run good with a cold engine, not so good hot. I would say the sooty plug has the bad injector.

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