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Hello everyone. My first time on the forum. Really exciting! My girlfriend has a 1994 Chevy Lumina 3.1L v6. When she’s idling in drive (like stopped at a light) for a while, the service engine soon light comes on. The code was #35 (I AC valve). When I pulled it out the pintle was far longer than maximum length. So I swapped it with a new one. Car still says service engine soon. Same code. Any words of wisdom would be greatly appreciated.
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check for any and all vacuum leaks. the I.A.C was compensation for a vacuuming leak that’s way the pintle was all the way out. F.Y.I the 3.1 has a big problem with intake manifold leakss the common leak location is along the s shaped molding on the block where the vally pan sits. your girlfriend’s car most likely has this problem. Check for a recall you and /or her might be able to get it done for free maybe maybe not it’s worth checking. before the coolant pumps past the faulty seal and blow’s her engine. being a 94 Chevrolet Lumina 3.1L v6. your looking at about 2k to 3k for a long block replacement.
the replacement manifold gasket set can be gotten at any auto parts place most common gasket set is made be fel-pro. for the diy’er it’s take most likely the whole day depending upon D.I.Y experience.
and all torque sequence must be followed the letter.Since you didn’t say wheather the engine was running faster or slower than normal or seems ok it makes my recommendations a little more difficult.
First thing i would do is make sure there are no vacuum leaks ( split hoses etc.) if nothing found then make sure the throttle plate and throttle bore are spotlessly clean.
Remove the negative battery cable for 5 min. and then reinstall. Start engine and shift to drive while holding the brakes on until the cooling fan comes on. Restart engine.
If this does not correct the problem you will need an IAC noid light to test the computer outputs to the IAC valve. Possible ECM or wiring problem exists.
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