No Injector Pulse after Distributor Swap ---

[The Bronze]

Re: No Injector Pulse after Distributor Swap ---

I just talked to him, if its not the Alarm acting up ... he thinks its the ECM.

I am curious what makes him "think" it is bad. Is there a reference signal to the ECM (or ECM is showing rpms when cranking) and the driver isn't pulling power (that should be there) to ground? The ECM powers (indicated below) and the Grounds (indicated below) are good (not with an ohm meter)? Most ECM/PCM replacements don't fix a thing...

It is possible that the alarm system intercepts the injector wiring, but usually in the aftermarket don't they intercept the starter wiring? Easy enough to tell:

Does the ECM have power to the injectors circuit (ground side), Does the ECM have ALL the powers and good grounds? If they are there during a crank/no start and the injectors ground side is powered (no ground at the ECM) then the problem isn't the alarm. If they had done the proper diagnosis (as described), they would have their answer....:tdown:

I wish you the best of luck on this.

 

[The Bronze]

Re: No Injector Pulse after Distributor Swap ---

By the way, I would be more than happy to send this clown a wiring diagram with the circuits to check and the readings he should be seeing if that helps your cause. Most shops don't like it, but I am used to busting their chops.

Also, I wouldn't pay for an incorrect diagnosis, I would get all parts back and then reinstall to see if they were indeed bad.

I noticed I missed a ground. D9 is a black/red wire. It is the ignition module circuit ground. Gotta check that out as well. Sorry, just opened a book to verify my notes. I also edited my first post for the proper pin for engine rpm (D8 purple/white).

 

[alwayscode390]

Re: No Injector Pulse after Distributor Swap ---

OK, it was NOT the alarm.

He says he can get it to start with something in the throttle body.

He now thinks its the ECM and has one on order.

Would the ECM only go bad in the injector pulse area? Seems like everything else is fine.

Is there a chance it could be the fuel pump too? I pressed the schrader valve and it shot gas out.

The battery has been swapped out multiple times recently from the weather. Could that have blown something? It started for me 2 times after the last battery swap though. ---

 

[Richie Rich]

Re: No Injector Pulse after Distributor Swap ---

I wont take it back there again.

Hes blaming it on my alarm system shutting down the injectors ... but I am not even sure my alarm is wired into the injectors.

The truck sat for the last 4 months , so the alarm is getting finicky ( the battery was taken out ). Thats the only reason I am considering his idea.

I think he disconnected the harness while installing the distributor. The bad thing is the longer he DIAGNOSES it ... the more it costs me. Thats the only reason I am trying to help , hahah ... pretty sad, I know.

It sucks not having a place to do this stuff myself ---

Have them disconnect the alarm system.... Shouldn't that rule it out?


Nevermind. Sorry I didn't read your last post.

 

[alwayscode390]

Re: No Injector Pulse after Distributor Swap ---

I dont want him disconnecting the alarm ... I think the alarm is fine and plan on using it.

If its not the ECM (still waiting on the part to show up, I could have gotten one quicker myself) I may go that route though.

Thanks ---

 

[Richie Rich]

Re: No Injector Pulse after Distributor Swap ---

So does it start with starting fluid? If the injectors are not working then shouldn't that fire it up? I'm no mechanic so I may be speaking out of turn here. Just trying to help.

 

[alwayscode390]

Re: No Injector Pulse after Distributor Swap ---

Ended up being my ECM, thanks for the help guys ---