please help guys

can anyone please help me! i have just purchased a lovely mk1 cabriolet with a new 1.6gti engine in, it has since died! came out one morning and wouldnt start! seem to have spark, and fuel pressure to mechanical injection setup but no pressure if i crack off the fuel pipes on top of the unit going to the injectors! has anyone experienced this b4 or got any ideas? cheers Jon

Jon,

Check that the induction hose is not disconnected - this big hose thae goes from the metering head to the engine.

If OK do prowler's injection test - found at www.vwgolfmk1.co.uk and report back with your results.

Cheers

Rich

the injectors themselves are ok, its just that there is no fuel to them! what governs the fuel pressure in the injection system mate?

jon,

Do the test.  It's not to check the injectors but to see what happens when you try to do the test.  Report back.  Your results will enable us to diagnose your problem more easily.

Also check the cold start valve (5th injector) is operating correctly.

Cheers

Rich

ok seems a bit long winded though, gonna take me ages to get all the gear together

just one more question, how does the fuel system create pressure and what governs it? then ill do the test.

The fuel pump geneates the pressure and the pressure control valve in the metering head controls the pressure.  The warm up regulator modifies the pressure slightly when cold which richens the mixture.  The accumulator helps smooth transient pressure.

Cheers

Rich

you won't get fuel at the top or injectors unless the the flap in the airbox is lifted, either by air through the intake or manually lifted, but u have to do this with care if u damage the plate or scratch the sides your airflow meter may not perform properly afterwards.
but just because the pump is pumping doesn't mean its the rite pressure.

hey guys, fixed the problem, the flap was stuck down and not being lifted by the manifold vaccuum! works fine now.
one more question though. when warm it seems to idle too high! doesnt seem to be the 5th injector as i tried removing this. any ideas? Jon