2001 x5 4.4 starts then dies.....HELP!!!!

[asecertified]

Never found one with an external short of the dme. Just saying it is possible since you already swapped your dme once and still have problems. Something could be frying them.

[blakey2000]

WELL its fixed, cost me 2600$ to figure it out but to save aeveryone trouble, replace the computer (DME) first then if that doesnt fix it its the MAF as well. That combination worked for me. If you do that itll only cost you 1000$

[blakey2000]

Originally Posted by asecertified

Maybe this will help in the future.
This is what has happened. The DME internal circuit 15 is the 5 volt supply for some sensors. It is the supply for the throttle actuator. This voltage is now battery voltage causing the codes for high voltage as it returns to the DME over the max of 5 volts. Have seen this on a few 4.4l w/ DME 7.2's.

Looks like George goofed on this DME repair or something is shorting this circuit.

you were right it was a bad MAF shorting the ECU. replaced both and it runs

[upallnight]

So did the bad MAF damage the first rebuilt DME from ECUDOCTORS? How did you determine that the MAF was shorting the DME.

[asecertified]

Originally Posted by blakey2000

you were right it was a bad MAF shorting the ECU. replaced both and it runs

unfortunately, i think you were misinformed.

This is what happened...

The o2 sensor caused the short. The heater circuit internally shorted to the 5 volt reference causing battery voltage to all other circuits on 15.

battery voltage to maf, throttle body and the dme killed them, along with the cam sensor.

[blakey2000]

No the DME from ECU doctors was programmed wrong I got 1 from rpm and it worked with the new MAF

[blakey2000]

Hey asecertified.....
.did you do the work on my truck?

[asecertified]

Yes, Im the one.

[blakey2000]

Ahhhhhhh. Why didnt you tell me. I never got a chance to talk with you. The way i heard was the cam sebsor and o2 may or may not have been the cure. Either way after alot of work and research you figured it out. Im glad to be driving again!

[asecertified]

needed all of the info i could obtain. if i told you right away, i might not have found out some much needed info. PM me and ill give you my # and we can talk about it some time this week.