goldminer

My engine has been cutting out under boost and then refuses to start until the engine is cold. There is no coughing or spluttering it just dies. I've got power to the spark plugs, I've got power to the fuel pump relays, I tried changing the relays around and the engine will turn over but won't fire.We thought it was the fuel pump so we changed that out and refplaced the WUR but I had to get towed home on the weekend so that wasn't the problem.
This morning it started normally and I drove it slowly to the workshop (15 minutes). When we tried to restart it the car wouldn't fire.
Any suggestions? Two weeks and many dollars have passed so far and I need some new ideas.

PorschePhD

Have you tried the over boost relay? It is as bad as the failing DME relay. It is the yellow relay in the engine bay. Very common issue.

goldminer

Thanks for the prompt response. I'll try that and let you know.

Peter Carroll/Toronto

When I had that it was a faulty CIS ignition box. Once it cooled down it worked again for a while. For some reason it liked to die under full throttle. Probably that was when it was working the hardest.

goldminer

I think we've got it fixed. Apparently there's a relay in the back which is common to both fuel pumps which was faulty. I'll get it good and hot on the weekend and see what happens.
Thanks for the advice, it enabled me to point the sparkies in the right direction.

PorschePhD

Great! That is the overboost relay.