91 volkswagen GTI fuel problem

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spydey - 01 Jun 2006 05:03 GMT

Hey guys.

customer recently brought in a 91 GTI. We thought it was a fuel leak
at first but realized quickly that the gas was leaking out of the
exhaust flange from INSIDE the exhaust. We pulled the plugs and found
A LOT of fuel inside the cylinders. The car has spark but is for some
reason jetting WAY too much fuel into the combustion chambers. Any
help would be appreciated.

Thanks
Jesse

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Ralf Ballis - 01 Jun 2006 06:27 GMT

Any possibility could be a leaking starting valve.
Is it in all combustion chambers?

Regards,

Ralf

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Erfinder des Abgasturboladers Dr. Alfred J. Büchi: "Die Abgase,
deren noch inne-wohnende Energie bis dahin vergeudet wurde ..."

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spydey - 01 Jun 2006 07:31 GMT

Yes, it's in all the combustion chambers.

Thank you
Jesse

> Any possibility could be a leaking starting valve.
> Is it in all combustion chambers?
[quoted text clipped - 6 lines]
> Erfinder des Abgasturboladers Dr. Alfred J. Büchi: "Die Abgase,
> deren noch inne-wohnende Energie bis dahin vergeudet wurde ..."

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spydey - 01 Jun 2006 17:20 GMT

no cold start valve on this model.
Jesse

> Yes, it's in all the combustion chambers.
>
[quoted text clipped - 10 lines]
> > Erfinder des Abgasturboladers Dr. Alfred J. Büchi: "Die Abgase,
> > deren noch inne-wohnende Energie bis dahin vergeudet wurde ..."

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spydey - 02 Jun 2006 17:44 GMT

disconnected fuel and the wiring to injectors and the car fired right
up. only for a few seconds mind you because of the lack of fuel.
So.....we've narrowed it down to injectors, regulator, or......possibly

the computer commanding the injectors to stay open
jesse

> no cold start valve on this model.
> Jesse
[quoted text clipped - 12 lines]
> > > Erfinder des Abgasturboladers Dr. Alfred J. Büchi: "Die Abgase,
> > > deren noch inne-wohnende Energie bis dahin vergeudet wurde ..."

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Kevin - 03 Jun 2006 01:03 GMT

> no cold start valve on this model.
> Jesse
[quoted text clipped - 13 lines]
> > > Erfinder des Abgasturboladers Dr. Alfred J. Büchi: "Die Abgase,
> > > deren noch inne-wohnende Energie bis dahin vergeudet wurde ..."

Disconnect the harness connector from the ECM and all injectors, then check
each injector signal wire for a short to ground. If there are no shorts then
replace the ECM because it has an internal short in the injector driver
circuit.

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Kevin Mouton
Automotive Technology Instructor
"If women don't find you handsome, they should at least find you handy"
Red Green

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