rough running and no idea why.. - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 06-18-2004, 12:00 AM
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Hi,

i'll start from the beginning - 'tis a very good place to start....

My brother in law used to have a wrecker/towing business - he towed an '84 318i and an '85 318i.

the '84 had a head gasket problem, and the '85 wasn't too bad apart from the radiator being shot.

To cut a long story short, the '84 is the only one with the good title, so that's the car i have to run.

I took the head off to replace the gasket, and found out that the head was cracked. So i replaced it with the head off the '85 model. I put it all back together and it seemed to be not too bad for a basically rebuilt motor. It was a little rough, and i put this down to needing some run in time and old parts.

At this point, it had a really rough idle - if at all, and seems to misfire.

After much Tender Loving Care, and 300 miles, and new filter,oil,air filter, plugs wires it still misses. I've gotten the "best" of the 2 cars, idle control, coil, air flow sensor, barometer and none of this seemed to help.

I've checked all of the vacuum tubing and that seems fine. It's had 2 or 3 injector cleaner liquids gone thru it.

Despite that, it seems to run fine - i haven't got an accurate MPG figure yet, the speedo cog still needs replaced.

The other problem i have.. is when it gets driven at high RPM, 5k-6k range, and then the motor is stopped a few miles later, it will not restart no matter what i try... i've tried swapping ECU from the other car and nothing... and when run without it at least fires and runs for 5 seconds. Leaving it overnight seems to be the only thing to do.

SO to cut a long and many dirty hand hours short, it runs rough at idle, and why it still misses.. if anyone has any idea at all, i'd be much obliged!

Thanks,

Matt
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#2 (permalink) Old 06-19-2004, 06:28 PM
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Ok, i solved it.... twas the plugs. The ones autozone "recommended" don't seem to fire at all once they get a little damp, and only produce a smaller spark in the air. It runs a lot better now, but i still don't think i'm getting enough flame so to speak...
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