94 lumina van, fuel trim intmnt. fluctuates


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94 lumina van, fuel trim intmnt. fluctuates

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

samg.
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samg. profile image

Apr 12, 2011, 4:46 PM

Post #1 of 3 (1486 views)

94 lumina van, fuel trim intmnt. fluctuates	Sign In

Hey, I'm actually stumped and have turned tot he forum!

I have a van in my stall at work, it was brought in for some f/e repair and a stinking exhaust. We changed the 02 sensor as it was bad, and the stink went away. I noticed before I did the repair I was test driving it. It would kind of sputter and then it would smooth out.

Well I hooked up the tech 2 and the fuel trim will go from 100 to 170 at idle every once and awhile, it'd sputter then smooth out. I have checked fuel pressure, flow, for vacuum leaks, and egr, all fine. I really am at a stand still. It doesn't do it all the time. I drove it 15 miles and then let it idle for 15 minutes and it ran perfect, fuel trim was 125-130 the whole time. Let it sit for ten minutes then started it to let it idle, and withing in 3 minutes it was doing it. It seems like the cooling fans turning on sometimes will trigger it, but i'm lost. Any help is appreciated.

Hammer Time
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Hammer Time profile image

Apr 12, 2011, 4:58 PM

Post #2 of 3 (1474 views)

Re: 94 lumina van, fuel trim intmnt. fluctuates	Sign In

I would try giving the ECM a couple raps while it's idling. There's a good chance it's a bad ECM but you also need to check grounds and power supplies and the 5v reference.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

samg.
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samg. profile image

Apr 12, 2011, 5:59 PM

Post #3 of 3 (1469 views)

Re: 94 lumina van, fuel trim intmnt. fluctuates	Sign In

I'll check it out, according to the customer, of course it never did it before.

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