1995 Mk3 2.0 GTi cutting out

[JW590]

Today's update.

I did all my wiring checks and found that the 12v on the red/yellow wire to the pump is intermittent, with no regular pattern and doesn't seem to be linked to anything - i.e. revs etc. Really strange how it's at the fuse and at the end of the 'permanent' feed I've taken from the fuse, yet intermittent on the red/yellow that comes from the fuse. I have determined that there's nothing wrong with the fuel pump earth lead that is in the same loom. The plug is on the pump now with the red/yellow disconnected and replaced with the 'permanent' feed.


I checked and cleaned some of the earths - no change.

I bought some 10K Boost, followed the instructions and cleaned the Throttle Body - no change.

I disconnected the MAF and the car wouldn't tick over but I ran the car (at standstill) by keeping the revs up - but it also eventually just cut out. I took the MAF off and looked at it but it was clean (doesn't mean it's working).

Whatever it is, it is kicking in and cutting out when the engine is around about the temperature when it is hot enough to start the electric fan - it runs for a while and then the engine cuts out - probably coincidence because sometimes it cuts out beforehand. Disconnecting the fan switch and the fan doesn't make a difference.

Tomorrow I am going to buy a new breather pipe - the one that links to the valve on top of the camshaft cover is badly split. I would say that it was almost torn in two.

I've put it away for the day now, another six hours spent on it.

[wakeskater]

dont rule out a cheap crank sensor    i had this cut out when temp got up to 82  ish  let cool down would go again  got a gen part of vw a day later prob solved

[madmanmart]

Today's update.

I did all my wiring checks and found that the 12v on the red/yellow wire to the pump is intermittent, with no regular pattern and doesn't seem to be linked to anything - i.e. revs etc. Really strange how it's at the fuse and at the end of the 'permanent' feed I've taken from the fuse, yet intermittent on the red/yellow that comes from the fuse. I have determined that there's nothing wrong with the fuel pump earth lead that is in the same loom. The plug is on the pump now with the red/yellow disconnected and replaced with the 'permanent' feed.


I checked and cleaned some of the earths - no change.

I bought some 10K Boost, followed the instructions and cleaned the Throttle Body - no change.

I disconnected the MAF and the car wouldn't tick over but I ran the car (at standstill) by keeping the revs up - but it also eventually just cut out. I took the MAF off and looked at it but it was clean (doesn't mean it's working).

Whatever it is, it is kicking in and cutting out when the engine is around about the temperature when it is hot enough to start the electric fan - it runs for a while and then the engine cuts out - probably coincidence because sometimes it cuts out beforehand. Disconnecting the fan switch and the fan doesn't make a difference.

Tomorrow I am going to buy a new breather pipe - the one that links to the valve on top of the camshaft cover is badly split. I would say that it was almost torn in two.

I've put it away for the day now, another six hours spent on it.

Split breather will not make is cut out.

[JW590]

Mart - I understand that a split pipe won't make it cut out, but I may as well replace the breather pipe while I'm working on it - so I have bought a new one off Ebay for £14.94 including postage.

Dragon / Mart - I have found out this morning that the engine type is ADY.

Skater - The new crank sensor is Bosch, so not a cheap one.

The only thing I have not replaced on the ignition side is the actual distributor - and the Hall sensor is built in to it and may be failing when it gets hot. I suppose I will have to buy a new one as it is the only way to eliminate it.

[JW590]

Deleted because of duplication.

[JW590]

The latest update -

Ignition - all new parts
Crank sensor
Coil
Distributor
Dizzy cap
Rotor arm
Plugs
Leads
ECU relay

Fuel- all new except pump
Fuel filter
Fuel pump - used but works
Fuel pump relay

Breather hoses replaced with new ones because they were split.
Cleaned out Throttle Body
Changed off-side front sidelight bulb.

Last night it ran for 16 miles then cut out. Immediately started, ran for 1 mile and cut out, waited a while, started, ran for 3 miles and cut out... and so on until I got home. On one of the later cut outs I sat and waited and heard a relay click - I turned the key and the car started.

I think it ran for 16 miles because it took a while for it to get up to an indicated 90 on the temperature meter. It drove the last three miles home, with my fingers on the relays hoping it would cut out, running at about 70C on the temperature indicator, but it didn't cut out. Left it ticking on the driveway while I moved the other cars - it hit 90c and cut out. Therefore something somewhere is breaking down at temperature.

The (new) ECU relay was hot.

I assume I have changed all ignition parts except for the ignition switch, the ECU, and the Lambda sensor.

When it ticks over it is very steady, and when it cuts out it is an immediate stop, no spluttering or anything.

Anybody got any fresh ideas that I haven't tried?

Thanks

John.

[VR6_Wherry]

Have you replaced the temp sensor then?

[JW590]

No, which one and where is it?

I can get one while I'm out today.

Thanks

[VR6_Wherry]

Good diagram in this thread: http://www.golfgtiforum.co.uk/index.php?topic=101400.0

[JW590]

Have replaced the temperature sensor with a new one.... no difference.

The next thing I have to change is the ignition switch.