Hi,
I'm posting this on behalf of a friend who has a weired problem with his 1992 Mk 3 Golf GTI.
It is suffering some undiagnosed electrical fault. It's happened twice and he has taken it garage can find the fault. The symptoms are as follows:
Hot engine (normal long run) under deceleration the car stops as if there is a fuel stoppage, in actual fact the fuel pump fuse has blown. When the fuse is replaced the car will start and run OK below 2000rpm. Above 2000rpm the fuse blows again!
On both occasions it has gone to two different garages who disconnected the ECU and took it to VW to test out. No fault was found with it and when it was replaced the fault goes away... until the next time......
I've got a mk3 golf also and looking at my Haynes manual it seems the fuse for the fuel pump shares the same circuit as the lamda heater.
Any ideas? This is a weired problem!!!!
Thanks
Rob
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If there's nothing obvious, then it is a question of checking the wiring diagram, and tracing everything that is supplied by the troublesome fuse. Then, one by one these components should be checked out, including the wiring to them. Not easy, not quick, but you should find the fault.
Hopefully, at the stage of looking at the wiring diagram, a likely candidate for the fault will become clear.
number_cruncher
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Put an inline fuse in the feed at the pump 5 amps I think then run the car and if the pump fuse does not blow then the LAmda sensor is in doubt. Quite why it would be rpm sensitive I'm not sure but you could gat the engine hot then disconnect the heater connection then run the car to see if the fuse still blows. Regrads Peter
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Thanks for your replies. I'll pass the info on!
cheers
Rob
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