Author Topic: Cav 2.0 8v problem  (Read 1986 times)

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Offline J A M E S

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Cav 2.0 8v problem
« on: May 19, 2006, 13:48:05 PM »

Mate of mine has a 2.0 8v cav M reg 1995

When he turns the engine off, the engine tries to keep going.

Any ideas?


If you have to own a Calibra; make sure it's the 4x4 turbo. You dont want to fanny around with a FWD car.


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Re: Cav 2.0 8v problem
« Reply #1 on: May 19, 2006, 14:06:46 PM »
Watcha James, think we had a tread on the old forum about this. Anyway, had this "filed" away:

Brief Running On After Switch Off

This is usually caused by the car dieseling.


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Re: Cav 2.0 8v problem
« Reply #2 on: May 21, 2006, 15:23:09 PM »
i think i had same problem long time was because of the fuel type..check yours mate


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Re: Cav 2.0 8v problem
« Reply #3 on: May 21, 2006, 19:28:05 PM »

There is no brown-white wire going to the alt. It's blue-wite.

The fuel pump draws a ludicrous amount of power - much more than can ever be supplied by a sneak current.

The ECU itself won't spark the plugs on a sneak current.

The injectors won't open on sneak current.

Anyways, that means that it can't keep running for long because the fuel pump cuts out so the most it can do is a second or so on the remaining pressure in the rail. And if it does that, it means that something in the combustion chamber(s) is *glowing*, igniting the fuel.

This is either a sticky fuel pump relais or some carbon or the prong or electrode on the plug. The latter can be caused by low octane fuel because detonation destroys the boundary layer that prevents direct contact of the flame front with the metal in the cilinder.

So - you check the plugs, put in some decent fuel and a bottle of STP Complete Fuel System Cleaner (solver bottle, don't waste your money on anything else)

If the problem remains, you replace the fuel pump relais.