hello and welcome,

recently another forum member had a similar problem, turns out his no-start problem was caused by a combination of cold temperatures and water in the fuel tank. here's the link:
M104 will not start you may want to rule that out first.

i believe that the M104's from 1993 on, with HFM engine management, do not have a cold start fuel injector.

The majority of M104's had 2 major problems: 1) head gasket(poorly designed) 2) wiring harness(biodegradable wire insulation).

If both have already been replaced then you're in luck, the no-start problem is probably something simple like : 1)faulty ECT sensor(important for cold starts), 2) old/wrong spark plugs, 3) faulty under coil connectors, 4) fuel pump relay, or 5)major vacuum leak(s).


you should also build a code reader which will allow you to pull the Diagnostic Trouble Codes from the engine's computer. Check out the following thread which explains how to build it, specifically post#11: Reading Codes

PS i believe that the numbers in the diagram are Radio Shack part numbers, should make obtaining the proper parts easy.


good luck

thank you for the response. you're right about them being part numbers and thank you for referencing that to me. as we speak i'm at radio shack with soldering iron, wires, & everything i think i need for the led test kit.

as far as weather being an issue, i live in south west florida so it's fairly hot/warm throughout the day. & maybe you misread because the car does start just dies right after even if i get on the gas.