I tested the fuel line and all that. The flow is fine all the way to the fuel rail. The injectors simply WON'T inject...We ran the car off of ether and it still sparks and everything. I mounted and seated the injectors properly after the PO f'ed it up royal... Any suggestions? All I could figure was the DME died...
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If your car is like mine, there is a connector, similar to the connector that the oxygen sensor uses, below the intake manifold near the starter which feeds the fuel injectors with power. I would check that connector first. -
Thanks I'll try that ASAP!Comment
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It;s a 1985 325e, I see no such switch. I do, however see 2 clusters of ground wires under the manifold that aren't grounded. They look like there somehow related to the injectors. I'm a bit afraid to ground them, because one looks very...worn....Comment
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In my experiences with Bosch injection on VW's if certain ground wires are bad/break the injector driver in the ECU fries which causes the injectors to fire constantly. Sometimes you can see this if you take the ECU apart and check for burnt looking components but not always. Since you get spark it sounds like your crank reference sensor is working properly. I am still leaning towards a wiring problem, though the ECU may be bad as you suggested.
From someones random pic of an M20B25:
The harness/connector I am referring to can be seen directly above the engine mount bracket and above the spring on the oil return tube. The connector is round. You may or may not have it , but it can be tricky to spot sometimes. So if you DO have it, thats what it would look like.Comment
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Understand that the injectors get 12v power and the DME provides a ground pulse when it wants the injectors to fire. The injectors are organized as two banks of three, with one control lead from the DME going to each bank. The +12 side of all injectors are tied together.
The first thing to check is to see if +12 is present on all injectors. With the engine not rotating you should see +12 on both sides of the injectors because the ground side will be open circuit in the DME. Then unplug all of the injectors and continuity check from the Bank 1 & Bank 2 pins of the DME connector to the injectors (see http://wedophones.com/BMWManualsLead.htm for wiring diagrams).
If everything checks out, tee a pressure gage into the rail inlet line and crank the engine to see if proper pressure is present in the rail. If so, use a stethoscope or a noid light to see if the injectors are firing. If they aren't firing the DME is bad.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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I took the manifold off. The injectors in cylinder 4&2 had tips broken off...the tips were holding the valves open...and in cylinder 3 there was a rather large pool of gas. So I'm thinking 3 is stuck open, 4&2 got broken off the first time they popped out, and a check sensor must have shut the car off to protect the engine. This problem is rather comical to me mainly because its something that's so easy to do right, and this fuck-tard messed it up. Unfortunately this is my DD. Oh well. Riding my bike to work across town at age 19 isn't that weird I guess...Comment
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