Metric Mechanic 2900 Sport

[TobyB]

Yeah, you need more fan, one way or another.

And the idle hunting would have me digging around for a vacuum leak-
I've always wanted to get a smoke test rig going, like Jim Levie describes.

You MAY have too much engine for the ECU, but it's worth the effort to make sure
the existing one's fully functional first (tps, o2 sensor, fuel pressure, spark plugs, etc etc)

t

[berlow94]

It seems like a calibration issue.
That ecu is propably freaking out trying to run that modified of an engine.
With all of those hardware changes you could really take advantage of a proper calibration done with a standalone ecu.


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[jeffnhiscars]

Odds ar very high that rising temp in traffic is your fan clutch. confirm with the ole newspaper test

[jneumss]

Hey guys, I have an '89 325iX that has an MM 2900 Sport. It has headers, high flow cat / Magnaflow silencer, 286/276 cam, MM ST HiFlow Head, 10:1 CR, stock AFM with CAI, Bosch 344 DME.

Couple of questions with it:

1) It seems to run hot in traffic (between 1/4 line and center when moving; starts to get up to 3/4 line when sitting in traffic) - Head gasket replacement, water pump, thermostat, and coolant flush were done in March.

Is this normal? Should I do an electric fan conversion?

2) It idles really strange - I have read that a variable idle is pretty normal for the M20, but here is what is does:

• cold start - high idle (1500 - 2000 rpm);
• normal operating temp - variable idle (600 -1100 rpm) and sometimes slight vibration;
• with A/C on - high idle (2500 rpm +) whole car vibrates and water temp usually goes to 3/4 line or higher

Soooo, what should I expect it to idle like?

Thanks!