M2 Golf GTI engine running problem

[chrisptm]

Can anyone ofer any help with my Golf GTI the engine will not rev as cleanly as it should, it feels like it has no power .
Some times if i just switch it of for a few seconds and then start it up again the problem disappeares and it pulls like a train and revs as it should.
This problem is seems to be slowly getting worse, i have tried the obvious things like new leads /plugs /distributor cap/fuel filtter/ and so on
also i have checked any obvious wires for breaks etc
any ideas anyone

[nel]

An intermittent fault like that could be many things, but you seem to have already attacked a few of the standard culprits. Presume that you have also checked the ignition timing.

Other components (off the top of my head) that could do this are a dodgy petrol pump (you have two fuel pumps to consider - lift and injection) or a coil that is on the way out.

Best of luck

[chrisptm]

Thanks nel for the advice, is there a way of testing the pumps that you know of
or is it just a case of replacing them, they sound expensive
The timing has never been checked as far as know ? pardon my lack of knowlege but why could the timing cause this intermitant problem

Edited by chrisptm on Thursday 26th July 21:14

Edited by chrisptm on Thursday 26th July 21:15

[jas xjr]

its been a few years since i had a gti but you could check the air sensor.its mounted on the airbox.hth

[chrisptm]

Thanks jas xjr i will have a look at the sensor this weekend

[HiAsAKite]

8v or 16v?- what is it K-jet or digifant?

Edited by HiAsAKite on Sunday 29th July 01:29

[alextgreen]

HiAsAKite said:

8v or 16v?- what is it K-jet or digifant?

Edited by HiAsAKite on Sunday 29th July 01:29

Bang on, each has a list of common niggles that can cause this.

Some simple ones worth checking though:

Crud accumulates behind the coil and earths it to the bulkhead.
Both engines are very timing sensitive.
Temperature sensors cause a mixture of running problems and are prone to failing.

[chrisptm]

Thanks for the reply gents its an 8 valve im not sure how to tell the diference between K-jet or digifant but i can see that the injectors are all fitted to a rail( blue plastic i believe )
The car is quite old 1990 does this give any clues to the system type

[Bomber Denton]

It will be a digifant, also worth checking fuel breather.

[chrisptm]

Thanks for the advice gents i have changed one sensor already, a guy at Gearman and Swedish said "try the the blue one in the plastic moulding bolted to the front of the head" so i did ( sadly no change ) i have not looked at the coil as yet but will very soon
at the risk of sounding like a complete berk Bomber Denton where is the fuel breather

[Bomber Denton]

It's actually on the the filler neck, a big giveaway is that it will be slow taking in fuel.