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Old 09-04-2007, 02:51 PM
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Join Date: Jul 2006
Location: East Hampton, CT
Posts: 204
1990 300D 2.5 Running Rich

Greetings,
I'm currently finishing the engine installation in my 1990 300D and have one problem left. Black smoke!

The car runs very very very rich. So much that I'll make your eyes water.

I even ran a separate container of fresh diesel just to make sure that I don't have bad fuel in the tank.

I replaced the timing chain. Cam marks align with TDC indicator. I've installed the IP with the locking tool at 15 deg ATDC. I used the allen key to adjust the timing within a certain range with no change.

I cracked each injector line individually with the same loss of cylinder affect and no change in smoke content.

The air filter is a K/N and is clean and not over oiled! I have also run the car with the air box disconnected from the air filter. There is no appearance of air restrictions.

Also when giving the car gas, if I don't let off the gas pedal slowly the car stalls. Example - Rev to 4000 rpms and let the rpms fall and the car stalls. If I hold the pedal a little the car's idle will fall slower and then regain idle.

From other posts... the vaccum controlled valve located after the turbo is suppose to move with actuation of the throttle this does not happen.

I'm going to perform a compression test later this week. I should have codes pulled this week. Any other suggestions on how I should trouble shoot this problem? Can the EDS alone cause a rich condition or does it just control idle?
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