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Replaced in take boot, bc it had a rip. Clean throttle body. Replace crankshaft position sensor had a code. Replace CCV sensor, because the engine would shake as soon as I took off the oil cap, that solved that problem. Replaced fuel filter / regulator bc it had low pressure readings. Replace the MAF sensor with two different types of MAF sensors and it actually perform worse, woud stall out in turn off. my original problem with a MAF sensor voltage too low so I ended up cleaning it and that solved my problem as far as the MAF sensor. Bury lean codes still haven't cleared up. I know I don't have any air leaks because I had the system pressure tested. It can't be my fuel system because I replaced the fuel filter / regulator. So what could be causing my lean codes?
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Olease stop throwing parts at the problem. Doing so wastes money, doesn’t fix the problem and it angers the BMW goddesses.
The first step in diagnosing a problem is to scan the engine computer (DME) with the proper scanner. Removing the oil fill can will typically cause the engine to idle poorly as it adds unmetered air into the intake via the CCV. Also, there is no CCV sensor. I’m betting that’s a typo. The only way to find all vacuum leaks is to have the intake smoke tested. Go to www.bimrs.org to find a reputable indie shop that specializes in bimmers.
Jbird
Anything attached to the intake manifold can cause an air leak, probably over looked is the secondary air valve and the little vacuum hoses at the back of the manifold under neath, we had an e46 and the brake booster was causing the lean condition it so have some body look at it
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