1998 Chevy S-10 IAC? MAF? TPS?

DAYTONANITE

MEMBER
1998 CHEVROLET S-10
4 CYL
2WD
MANUAL
131,000 MILES

Hello. I just purchased a 1998 S-10 with a 2.2L, manual trans. Cold starts are fine and it runs good till I shut it off. Upon warm starts, more often than not, it will crank as if it is not getting fuel. If I mash the gas petal to the floor, it will start, puff some black smoke, and idle rough for a few seconds, then it is good to go.
To me, it almost seems like the IAC motor is sticking, but then I feel as if it could be the MAF sensor. If you have any ideas, I would appreciate the feedback. Thank you.

3 Replies

BUDDYCRAIGG

MECHANIC
2,262 POSTS

Sounds like a leaking fuel injector, and the engine is flooded.

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Thursday, April 23rd, 2009 AT 9:40 AM

DAYTONANITE

MEMBER
2 POSTS

That's what I thought at first, but while it acted up, before starting, I checked the fuel rail and there was pressure there. If it was a leaking injector, there would not be pressure in the fuel rail before turning the ignition on.

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Thursday, April 23rd, 2009 AT 11:49 AM

BUDDYCRAIGG

MECHANIC
2,262 POSTS

Depends on how bad the leak is. You would have to let it sit with a pressure gauge on it to get an accurate idea.

You have too many things suggesting it's flooded.
Mashing the pedal down to the floor is how you clear a flooded fuel injected car.
You get a puff of black smoke.
And the stumbling idle until the extra fuel is cleared.

That's all I can suggest you test at this point. Is to see if the presser bleeds down. Presser testers are only about 35 bucks.

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Thursday, April 23rd, 2009 AT 12:48 PM