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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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Old 10-28-2006, 07:00 PM   #1 (permalink)
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325e Diesel's

I have a 85 325e that has just got me stumped. It started diesel'n a few months ago only when it is warm-hot. never cold. I replaced all 6 injectors a few months back due to a failed one, so Unless I have a fualty new injector I dont belive that is the case. I also clamped off the fuel hose for the cold start to eliminate any fuel from there. I replaced the ignition cap due to wear but keept the original rotor. I have a fuel pressure gage on the car and dont see
an noticable leak down. I am out of Ideas here. Has any one ran in to this issue before or have any ideas?

Ps. I have also ran de-carb trough the intake and fuel system. and Have swaped the ecm out to eliminate that.
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Old 10-29-2006, 12:45 AM   #2 (permalink)
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You need to leak-down check the 7th injector, the cold start injector.
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Old 03-13-2007, 07:45 PM   #3 (permalink)
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I have started dinking around with the car again before I give it to my brother. And I would really like to figure out what is cuasing this.

As to Prerofing a leakdown test on the cold start injector as I stated in the first post I have clamped the fuel line to the injecter and drove the car for about 20 miles, and it still diesels. I have also removed the cold start valve and jumped the fuel pump to put pressure on the cold start valve and it doesnt leak. One thing I have found is that if I unplug the air meter with the car running and engine hot, the engine die's as it should. if I plug the air meter back in and start the car the turn it off via the ignition the car will diesel. Does the air meter have a direct relation to the fuel injectors? as in does it control the ground signal to the injectors? I always though that the ECM did this. Any help would be great.
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Old 03-13-2007, 11:59 PM   #4 (permalink)
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Yea, if your AFM is bad it could cause that, remove your AFM and move the flapper by hand and see if the spring is tension holds firm through the full swing and holds it shut and if it moves freely. Also find a bently manual to test the intake air temp sensor as well.
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