Quote:
Originally Posted by 88911coupe
Trying to localize a random no start situation and would like to try this bypass option. Basically what will happen is the car will turn over fine but never start. I just put a new DME relay in from our host and thought the problem was solved since I found a chunk of solder missing from he old DME. However after about 3-4 perfect starts the problem re occurred. I grabbed the DME, gently shook it a bit and could clearly feel the click at "on" position and then the car started fine and did so for several subsequent tries. So now I'm thinking maybe the new DME is buggy but it could be the rpm/flywheel sensors as well...very frustating! Anyway, I want to take the DME out of the picture by using the bypass...any danger in this, other than the fact that the fuel pump will run in the "on" position? I'm thinking if the problem does not occur for several days then it was the new DME being buggy...correct? There is another thread by Loren on how to test a DME relay but my ignorance on electrical issues leaves me with some questions on exactly how thats done.
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I bench tested my old one by applying 12 volts to the coil of the relay. IIRC it's marked on the relay which two pins are the coil. Once you apply power to the coil the contacts should switch. I think one is normally closed and the other normally open. If they switch the relay "should" be good but my old one checked out okay and still didn't work. Somehow it was closing but not carrying power.
I'd check your connections for your speed and reference sensors in the engine compartment. I had one that was cracked on the sensor side and would allow the harness connector to slip off slightly causing a intermittent problem.