1990 Volkswagen Transporter injector problem

Tiny
MIKE MCCLURE
  • MEMBER
  • 1990 VOLKSWAGEN TRANSPORTER
  • 178,000 MILES
#3 injector is spraying all the time. I swapped the wire with #4 injector and it worked. Also checked compression and it also is alright. I also checked all the injectors and they seem to work. This problem causes my engine to run very rough and of course rich.
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Monday, September 23rd, 2013 AT 11:08 AM

6 Replies

Tiny
WRENCHTECH
  • EXPERT
If you have one injector that is staying on and not pulsing, the the ground trigger wire is shorted to ground. That could be in the wiring or the PCM itself. The wiring will have to be tested to find out.
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Monday, September 23rd, 2013 AT 12:11 PM
Tiny
EXOVCDS
  • MEMBER
All Injectors fire at the same time.

Remove the injectors from the intake runners and cycle the key on / off with the injectors harness plugs
disconnected. If #3 cyl is leaking fuel, replace it.

If the Injectors do not leak, re-connect the harness plugs and crank the engine (disconnect the coil wire from
the distributor cap and ground it). All Injectors should pulse.

If #3 looks to be spraying all the time, rather than pulse, replace the #3 injector.

Thomas
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Tuesday, September 24th, 2013 AT 5:09 PM
Tiny
WRENCHTECH
  • EXPERT
Or you could just check the injector commands and wiring as advised before taking the injector rail all apart.
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Tuesday, September 24th, 2013 AT 5:14 PM
Tiny
EXOVCDS
  • MEMBER
I'm not stepping on your toes or saying my advice is better. As with all my replies (to VW / Audi Topics) I tend to speak from experience.

I'm sure you know what a rail looks like on a boxer engine. And how time consuming it is to remove 2 bolts to take out 4 injectors.

20+ years in the VW field. I have yet to see a wiring harness issue, or a bad ECM.

Thomas
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Tuesday, September 24th, 2013 AT 9:42 PM
Tiny
WRENCHTECH
  • EXPERT
I would think it is just common sense to first determine if the problem is electrical or mechanical before disturbing and possibly damaging injector seals and O-rings for no reason. Something as simple as just unplugging the offending injector should answer that question.
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Wednesday, September 25th, 2013 AT 2:36 AM
Tiny
EXOVCDS
  • MEMBER
He's already done that.
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Wednesday, September 25th, 2013 AT 10:53 AM

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