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You are watching: 2002 cadillac deville check engine light

Guys im having a problem with my 02 deville. About a month ago i pulled my car out of storage it had been sitting for about 6 months. Well since i took it out its been giving me problems. The check engine light turns on and about a week later it will turn back off. I notice it has a mis fire now and the check engine light turned back on. I changed gas the oil filled it with coolant all the minor shit. and its still acting up. The trouble codes i got out of it were p171 and p174. Maf sensor or engine mis fire is what the codes were telling me. Has any one had this problem. Please Help!!!!

P0171 - Fuel Trim System Lean Bank 1P0174 - Fuel Trim System Lean Bank 2 You most likely have a ripped plenum causing a vacuum leak. Rather common on the 2000+ Northstars. The plenum is the rubber coupler between the TB and the manifold. Do a search for plenum. It"s been discussed many times. There are even a few threads with pictures.

It may, or at least feel like one. Spray some Brakleen under the plenum, that"s where the rip will be and see if the RPM"s rise.
Is this a part i can get at the local auto parts. Or is it a dealership part. Or if worse comes to worse junk yard.

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