Wondering if anyone here has experienced a weak injector output at idle, however once off of the idle switch (throttle switch) no problems exist? If so, how did you determine this?

Also, while on the topic of the DME has anyone experienced any other issues with the DME regarding idle performance/engine performance?

 

Having read your various posts tonight, curious if you have ever tried a different DME?

 

Thanks for the effort in just reading through them all! I have not and would be ecstatic too. Unfortunately for many reasons I can't justify spending the $470 or whatever it is just for a refurbished dme with no klr.

If you know anyone that is close and willing to let me try one out let me know. I am very close to shelling out the cash for a new dme but i am searching hard for proof first.

 

Dude youve made like 5 threads for one problem. Try making one thread. It would be easier to track your "Idle Problem" rather than 7 different causes to one possible problem

 

there is a weak driver in my car its the fat ***** who had to many cheese burgers

 

Dude all you did in my thread was waste space. Do you think I am unaware of the fact that I made multiple threads?! I can track my idle problem myself, however it is nice to see some people are trying to put all of the information together to make an overall diagnosis - this is not what I was looking for but is much appreciated to get a reliable posters opinion. I am looking to find more ways of testing my vehicle so I can see with my own eyes the faulty component that is causing this concern. For example, if anyone responded with having had a "weak injector driver" then I would ask how they verified it and how much current the circuit was drawing at idle. I could easily check signals with an oscilloscope, however with no specs. to compare to how am I going to determine a faulty circuit within the DME.

(I would also like to note that I personally do not have the time to read page long threads - so I do not expect that of anyone else)

 

Just jumped the fuel pump and dme at terminals 87, 87b and 30. Car ran richer upon initial startup and the voltmeter read slightly higher. Once warm the same symptoms existed. Once again verified this air to fuel ratios are steady off idle and at idle the air to fuel ratios are more steady cold than warm (seems to gradually get worse as vehicle heats up).

 

Opened the DME and found terminal t560 and what looked like a transistor literally partially burnt and broken. Traced this to the wiring diagram from clarks-garage and found it controls the idle stabilzer valve!!! NEW DME WILL BE ORDERED!!!

 

Way to solve your own problem! Glad you learned something!

 

 

944online and others sell rebuilds with warranties.

Or... might be worth identifying the bad component and soldering in a new one. Mouser no doubt has whatever component is bad. (Assuming something else on the board isn't destroying the bad component.)

 

I had found a short in the wiring harness near the connector of the ISV almost two years ago but it is fixed. The DME is not the one that originally went with this harness either so and has been opened numerous times for testing on other cars, etc. I know that every wire in my wiring harness has 0.2 ohms or less with clean connectors. I do not suspect any current problems that would cause another failure.

 

How do you replace the transistor? Heat the solder joint (with what - soldering gun? would assume that would damage the circuit board) and then remove the broken transistor and replace it with the new one?

 

Also, Brian, if you have had one or both of these drivers fail what were your exact symptoms?

 

Thank you.