My car is a BMW 528 i1997 E39 a couple of years ago I hit a median ever since then its had a rough idle I gave to it to a mechanic that doesnt know crap. He changed my fuel pump same problem. Im in mechanic class now so ive been fixing it myself. SO when I started working on the car it was a no start due to the last mechanic breaking to fuel line to the fuel pump anyways I changed the fuel pump and the assembly on both sides of the gas tank I have changed the coils, spark plugs, crankshaft sensor, camshaft sensor, changed the oil, pumped out the old gas and put in new gas so it starts now but same rough Idle any ideas what it could be for such a rough idle im guessing it could be air intake manifold gasket. Also I dont know what this is yet but on the codes that are popping up it says my fuel trim is damaged what is a fuel trim mean for this car?
have the same problem?
Saturday, December 27th, 2014 AT 1:32 PM