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What is causing the injector to stay open

Tiny
PCHEFSONYA
  • MEMBER
  • 2002 DODGE CARAVAN
I have a 2002 Dodge caravan 3.3l that came in running rough. It would not communicate with the scanner. I replaced the PCM and still no communication with scanner. Compression test showed no compression on cylinder 1. Rings were washed out in that cylinder from Injector 1 dumping fuel. Installed new engine and still no communication with scanner and still dumping fuel on Injector 1. ANy ideas where to go from here?
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Monday, August 13th, 2012 AT 11:36 PM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Remove the harness to the cylinder and see if it still dumps fuel. It may be a bad injector

Roy
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Tuesday, August 14th, 2012 AT 12:04 AM
Tiny
PCHEFSONYA
  • MEMBER
  • 31 POSTS
I unhooked the harness at the injector and installed a NOID lite, instead of a pulse I got straight NOID light, steady light no blinking.
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Tuesday, August 14th, 2012 AT 12:11 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Ok, the return wire to the pcm is grounded causing this condition. You need to trace the wire back to the pcm to find the ground.

Roy
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Tuesday, August 14th, 2012 AT 12:20 AM
Tiny
PCHEFSONYA
  • MEMBER
  • 31 POSTS
Does each injector have its own ground or are all the injectors on one ground?
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Tuesday, August 14th, 2012 AT 12:24 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Each have there own ground but the ground is the pcm. You have a wire that is grounded before it hits the pcm.

Roy
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Tuesday, August 14th, 2012 AT 12:26 AM
Tiny
PCHEFSONYA
  • MEMBER
  • 31 POSTS
Would you recommend undoing the crossover pipe on the exhaust for easier access to the wiring and un-taping the wire loom and check manually the whole way or is there an easier way to track it down?
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Tuesday, August 14th, 2012 AT 12:30 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Find the color of the wire and trace it every 2 or 3 feet. You will have to remove whatever is necessary to get to the wire.

Roy
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Tuesday, August 14th, 2012 AT 1:42 AM

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