ecm problem

[stress]

i am working on a 1990 tracker that is lost injector pulse,i have a check engine light but no pulse,i changed the ecm the engine ran for 15 mins then quit,again lost injector pulse.i have no pulse from the ecm when backprobing from the connectors. any suggestions ????? the injector resistance is okay

[Depot]

i am only guessing here.. but it sounds like ur pooching ur puters somehow.. maybe a short between the puter and the injector and its burning out something on ur puter.

Really dont know what to even suggest....if u have another puter, maybe try running a wire directly from puter to injector and cut the current one that goes to it.. see if that solves it.. but that gets expensive if u keep pooching puters...

srry, dunno what to suggest


D

[Fullload]

I agree with depot on this one. You gotta have a short somewhere. Good luck. it may take a while. I assume you read your haynes manual to get the check engine code to realize that you have no injector pulse right?

[stress]

i checked under the hood at the injector wires and had no pulse,i the checked the power and ecm grounds all are good,i backprobed the wires at the ecm and have no power to the injector and no driver

[Depot]

so u pooched another puter??? try bypssing the injector wire from the puter to the injector with a 100% good one b4 u try another puter - leave urself enough wire in the main harness when u cut it to attach either end as needed

D

[Twinkie]

Friend of mine toasted 3 ECM's before she found the short between the injector and the ECM, was on a 90 as well. Don't know what they finally did to isolate it.

[stress]

i am waiting to hear back from the customer,to see what they want to do,ya i work at canadian tire ya i know crappy tire!!!but i get to see alot of weird problems ,all i do is electrical and emiisions and drivability problems, i might power up the injector with key on power,and use the dist reference wire from the dist and try to fire the injector on the ground side or dist reference.its worth a try.