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03-05-2011, 02:06 PM
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#1 |
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Registered User
Join Date: Mar 2011
Location: Akron, NY
Posts: 1
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Help
Ok, i have an 87 gmc 2500 w/350 tbi. It recently started studdering, shuttering,jerking, how ever you want to work it while driving, it almost feels like a missin the motor, however its not, i have changed the plugs (ac delco) cap,rotor,wires and coil and its still doing it, also the exhaust has a rotten egg smell to it, any suggestions? i am new to the tbi motors
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03-05-2011, 06:10 PM
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#2 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: Help
Rotten egg smell is a righ exhaust. (Code 13 usually) The TBI unit itself may be the issue. On top of the unit is the fuel pressure regulator which is known to fail but they usually fail lean. The temp sensor may also be telling the computer the eng is ice cold which richens the mixture. I think thats a code 14 or 15. Then there is the MAP sensor which works in conjunction with the TPS. MAP sensor reads manifold vacuum and the TPS reads throttle position. The MAP failure code is 33. I don't remember the TPS code. Also another thing to look out for is the TBI base gasket, which is the place I would go first. Check that with some carb spray, eng running. jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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03-07-2011, 12:13 PM
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#3 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Help
choke staying on running to rich?mine would give some black smoke
cat clogged up? check for good exhaust flo,have someone follow you while warmimg up
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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03-07-2011, 12:32 PM
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#4 | |
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Registered User
Join Date: Oct 2008
Location: Brighton, TN
Posts: 1,267
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Re: Help
Quote:
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A computer once beat me at chess, but it was no match for me at kick boxing. Duct tape is like the force. It has a light side, a dark side, and it holds the world together. |
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03-07-2011, 02:58 PM
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#5 |
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Registered User
Join Date: Jan 2009
Location: Staten Island, NY
Posts: 109
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Re: Help
I'd have to agree with monte!
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03-07-2011, 06:10 PM
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#6 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Help
i agree ... wondering why tho, was it running rich....see any black smoke lately?
cat clogged up? or is the heat riser sticking/staying closed? check for good exhaust flo,have someone follow you while warmimg up ......can't always see "no flo" from inside seeing he is in NY he is prob using the choke starting
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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