2.3L ('83-'97) SOLVED: '94 Ranger not pulsing #2 and #3 injectors

[frozenrabbit]

'94 Ranger, 2.3l spark confirmed at all plugs. Will start and run, but #2 and #3 are not getting fuel. 12v at all injectors. Can pull #2 and #3 at idle with no change in idle.

 

[SenorNoob]

I would suspect the wire connecting them to the PCM. It should be white connected to pin 59 of the PCM. That's injector bank 2.

 

[frozenrabbit]

White wire has continuity from #2 and #3 to PCM connector. Only OBD codes I am getting is from deleted ERG, 335 and 558.

Probe light on white at #2 and #3 injector connected to battery (+) does not flash. Stobes when hooked to #1 and #4 while rough idling, like a NOID light.

Originally cut out when driving, lowered rpm and they came back on, then out again with rpm increase, then just stopped pulsing completely.

Swapped around injectors, #2 and #3 work when installed to #1 and #4. Swapped between 2 ICM modules, no difference.

Failing PCM, or crank sensor? Replaced crank sensor 3 or 4 years ago, but when the old one was failing it was a complete no start. Confirmed spark on all plugs.

 

[frozenrabbit]

TPS tested within voltage range. ICM has 12.4v from ground pin to battery.

Crank sensor is at 9.17v, off and on with engine rotation.

Cylinder ID sensor is at 8.78v, off and on with rotation.

Going off of tests from this link:

How To Test The Coil Packs, Ignition Module And CKP Sensor (1989-1994 2.3L Ranger, Mustang, B2300)

2.3L Ford Ranger Index of Articles

easyautodiagnostics.com

Says CKP and CID should be 10-12v, but doesn't say anything about being under 10.

DAYUM!!!! I think I'm gonna go in for the crank sensor, already know it's a P.I.T.A. job, but need to do a front crank seal anyway.

Anyone run into this? Does hard start and run on #1 and #4, spark to all plugs, but not switching between injector banks, no fuel to #2 and #3.

 

[frozenrabbit]

Not the crank sensor, just replaced it today.

 

[frozenrabbit]

Blown power mosfet for injector bank 2 on ECU board. Replaced and RUNNING!

 

[RobbieD]

Good catch.

 

[frozenrabbit]

It could of age cracked, there's heavy spring clips that hold the mosfets against the housing. '94 with 370k miles.

 

[SenorNoob]

NICE WORK!

 

[frozenrabbit]

Couldn't find this issue anywhere on this forum, or any where else. Found a youtube video for a BMW with bad mosfets.