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Re: Tuning question (archive)
[ Follow Ups ] [ 3-series (E30) Message Board ] [ Msg. Board FAQ ]
Posted by Shelby on August 06, 2000 at 09:13:33:

In Reply to: Tuning question posted by Chris on August 05, 2000 at 23:52:28:


Since I got my water pump and timing belt changed it was the first time since installing my Dinan chip I was able to test out that 5300 RPM redline. I punched it in first gear. I made it to about 5000 RPM before the car loaded up and quit revving. Lots of black smoke too. Tail pipe is very sooty. I guess I should do a plug chop to confirm but it seems to be running very rich up top. I thought these chips go lean up top. Anyway, let me bounce a few idea's around and you guys either shoot them down or tell me to look deeper or point me in the right direction.

1. Could I be running out of spark. Could the ignition be loosing energy at that RPM with the spark fading simulating a rich condition?

2. I have the stock intake, could it be so restrictive as to bring on this condition?

3. This is a high mileage motor, could it be blow by? Plugs look nearly perfect (clean electrode, insulator and ground, dark ring around the base no hint of oil fouling) and oil consumption is normal, about 1 quart between changes so . . . I don't think that is oil smoke. You can see the residue on my bumper.

4. On another post I listed problems with the car stalling when I hit a bump. I suspect a bad ground, others suspect bad relays and timing sensors. This could also be a factor too. I will check those out next week and keep you guys informed.

5. This was in first gear. The tach could be a little slow. Maybe I actually was at 5300 RPM and the limiter kicked in. Doesn't explain the smoke and sooty tail pipe though.

Any thoughts?

Sounds like a sensor problem. Could be either the air flow metter, the temp meter, or the O2 sensor, anyone one of them could be confusing the computer and causing a bad mixture. I'd spend the bucks to take it to a dealer and let them check the sensors out.


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