What causes the pulse? ECM or Module or something else? New Crank Sensor, New coil and module (BWD from Oreillys), New sparkplugs, and wires ohmed out good. The noid light did not flash on # 2 cylinder but did flash on other cylinders. Cold start there is not a miss, after warmup, starts missing on # 2. Thank You
No pulse at # 2 injector
- Thread starter regan j
- Start date
mikestertwo
Well-Known Member
- Joined
- Sep 13, 2006
Sounds like a wiring/connection issue or a bad driver in the ECM
There's only three possibilities here, if my thinking is correct:
1. Injector driver in the ECM (yes, the pulse comes from the ECM).
2. Wiring between the ECM and Injector.
3. The injector itself.
The noid light should still light up if the only problem is a bad injector - the noid light will flash as long as voltage is reaching it, regardless of whether the injector is good or bad (if I remember correctly). So, I think we can rule-out #3.
If you have a friend nearby with an ECM, see if you can swap it out with the one in your car. If the noid light starts firing after the swap, then you know your ECM has a bad injector driver. If the noid light still does not fire, then you know there is bad wire or connector somewhere between the ECM and noid light location.
It seems like injector wiring harnesses are not particularly robust on our cars, many people have to repair or replace them. So, I would guess that is most likely the problem.
Good Luck,
1. Injector driver in the ECM (yes, the pulse comes from the ECM).
2. Wiring between the ECM and Injector.
3. The injector itself.
The noid light should still light up if the only problem is a bad injector - the noid light will flash as long as voltage is reaching it, regardless of whether the injector is good or bad (if I remember correctly). So, I think we can rule-out #3.
If you have a friend nearby with an ECM, see if you can swap it out with the one in your car. If the noid light starts firing after the swap, then you know your ECM has a bad injector driver. If the noid light still does not fire, then you know there is bad wire or connector somewhere between the ECM and noid light location.
It seems like injector wiring harnesses are not particularly robust on our cars, many people have to repair or replace them. So, I would guess that is most likely the problem.
Good Luck,
- Joined
- May 28, 2001
Pull both ends of the inj harness off, and check the #2 wires for continuity...While U R there, check the pins.
Thanks for replies. Went camping with my son and his Boy Scout Troop all weekend and have not had chance to install new ECM I got from Oreillys yet. On a cold engine the fuel injector is working as it should until the engine warms to operating temperature and then #2 injector is not providing fuel because it is not receiving the pulse to open.
Will check the above first.
Will check the above first.
