Chim starts& runs fine but engine cuts out when up to temp

[cerberaman]

So far, replaced:-
Coil, Ignition module, ecu temp sensor, ignition relay, swapped fuel pump relays with spares, all leads are new as is dizzy cap & rotor arm.
What else can fail when engine gets up to temp?? Car runs & pulls nicely till then.
Anything I've missed??

[griffdude]

Tried cleaning the stepper motor?

[900T-R]

I'd suspect a temperature-related problem with a sensor?

[cerberaman]

Stepper been disconnected since i bought car last year?
Never been a problem before.

[e635815]

That's the third topic created on the same problem.
Look for mine: http://www.pistonheads.com/gassing/topic.asp?h=0&a...
and the one from DHUDD: http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Still haven't been to the bottom of it yet but still investigating.

The first one to find gets free beer!!!

[taylormj4]

If it happens as the fans try to cut in, it may be due to a bad earth for the fans, so when they cut in , it's pulling the ECU, ignition module or other sensor voltages all over the place.
Try disconnecting the otter switch so that the fans can't cut in and see if problem goes away - obviously keep a very careful eye on your engine temp though whilst the otter is disconnected, or you could end up with a more expensive problem.

[captaintact]

taylormj4 said:

If it happens as the fans try to cut in, it may be due to a bad earth for the fans, so when they cut in , it's pulling the ECU, ignition module or other sensor voltages all over the place.
Try disconnecting the otter switch so that the fans can't cut in and see if problem goes away - obviously keep a very careful eye on your engine temp though whilst the otter is disconnected, or you could end up with a more expensive problem.

Good point. OR maybe one of the fans is short-circuited and shorting out the electrics/ignition when it kicks in. It may be cutting the engine before the fuse breaks? As there are 2 fans, disconnect one at a time with the connectors just below them?

[cerberaman]

Ive left the car running in the drive for ages, fans cut in ok, no cutting out. The problem seems to be when driving rather than ticking over, if that helps?

[captaintact]

cerberaman said:

Ive left the car running in the drive for ages, fans cut in ok, no cutting out. The problem seems to be when driving rather than ticking over, if that helps?

Put a wire across the otter switch to keep the fans turned on. This will not in any way damage the car but will keep the engine cooler. Try driving the car and see if it still cuts out........as the engine should not be getting as hot as usual......might help to diagnose?

[e635815]

Have you checked the magnetic sensor and its wires going to the plug (inside of the dizzy)?
Mines have just been diagnosed as being faulty and the symptoms are exactly the one you describe.

[myph]

Have you thought of faulty/cracked spark plug that fails at the high temperature under load,

[MikeTVR]

See my response to the topic 'Random Revs'