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Re: Need some HELP...more......................... (archive)
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Posted by Ken on December 03, 2001 at 16:52:23:

In Reply to: Re: Need some HELP...more......................... posted by John A on December 02, 2001 at 21:09:24:


You say they checked fuel pressure....did they monitor it while it was running and leaning out? A clogged pickup screen in the tank could be the cause. Another cause could be clogged injectors. The cold start valve (5th injector in the manifold) could be adding just enough extra fuel to mask these problems.
Also, has the coolant temp SWITCH been checked? (Not the coolant temp sensor). The switch closes to ground at about 118 degrees F. It should be open at temperatures below 86 degrees F.

My son just bought a 1984, 318i and from day one it has been in the shop. Me being a mechanic (Heavy Equipment)am not up on these cars. What it is doing , when start up will run anywhere from 2 - 7 minutes and then start leaning itself out to the point that it stops running. When it shuts off you can restart and it starts fine and then goes into a lean condition all over. Does't matter if cold, warm, or hot. The shop that has it specializes in German cars , They have replaced a few parts that they found out were bad and even tried a new (Main)computer just to see what it does. Same condition. The way that they explained to me it sounded almost like something was heating up and losing the signal and they said that they have checked and rechecked and can't find problem. Is there any place on car that a wire might rub through or could possibly be a ground problem that is common with this model? They have replaced the barometric sensor, air box, coolant sensor, checked fuel pump pressure, repaired bad wire on alternator, (thought that it might cause a bad input for voltage, and tried another computer for the fuel injection, it checked out OK. They have had car for 3 weeks and now it is not about money it is about just finding problem just to say that they FIXED IT so I figured I would put it out on the internet. If anyone could help I would appreciate it.Thanks


Thanks John, Mechanic said that he could diconnect the cold start and it din't make any difference, he also disconnected OXY sensor and it didn't make any difference, He also said that he was trying to TRICK the car into making it run in a Rich condition but to no avail. I told him about this site and he said that he would look it up sometime today. If he does maybe he can explain a little better about what he has done to the car. Thanks


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