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Cylinder 1 Misfire

  • Thread starter Thread starter Andrew Larsen
  • Start date Start date Feb 21, 2017
A

Andrew Larsen

New Member
Jul 18, 2015
25
0
1
Feb 21, 2017
#1
  • Feb 21, 2017
  • #1
Hello,

My 92 vortech v3 5.0 randomly died in a parking lot and had a no start cranking condition. I eventually determined that my PCM was fried.
I bought a used "working" A9L PCM from ebay and the car starts now.
But I have a cylinder one misfire. (The exhaust manifold is cold on cyl. 1 and I have fuel spraying out exhaust.)

I hooked up an injector noid light to the injector harness on cylinder one and the light was very bright and barley flickered. Not pulsing like it should.

I put the noid light tester on cylinder 2 injector harness and the light was dim and pulsed in intervals.

I'm lead to believe the PCM I bought has a bad injector driver ground to cylinder 1? Does this sound right?
Or maybe a bad wire to the PCM?
Can someone explain how to test this?

I really appreciate any feedback!!
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,247
17,927
224
Massachusetts
Feb 22, 2017
#2
  • Feb 22, 2017
  • #2
First question i'll ask.

Is this an original V8 car with 5-spd trans? Or has something been swapped?
 
A

Andrew Larsen

New Member
Jul 18, 2015
25
0
1
Feb 22, 2017
#3
  • Feb 22, 2017
  • #3
Mustang5L5 said:
First question i'll ask.

Is this an original V8 car with 5-spd trans? Or has something been swapped?
Click to expand...

It's a 92 5.0 with a vortec v3 sci and a tremec 3550 trans. It was originally a 5.0 with a t5 non Cali.
 
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