problem hot starting S2

[robro]

My S2 (2.9L) has just started playing up by not starting when hot. I removed the fuel pump fuse which got me started on one occasion but didn't seem to be a solution at other times. It has started very easily with a push/bump start. The battery is new and kept fully charged. Have any of you folk experience of a fault finding schedule they can advise me on please


Thanks very much

Robro

[GreenV8S]

The fact it bump starts easily seems to rule out the more obvious fuel pressure or ignition system problems.

Is the battery spinning the engine over OK? If not, check the voltage at the starter motor while cranking to see whether it's a problem in the motor, or the electrical supply to it.

Also check the ignition voltage at the coil +ve when the problem happens. If there is a heat related problem with the unbalasted supply, that might cause symptoms like that.

[robro]

Thanks very much for your comments. The starter spins very easily and at length with the fully charged new battery.
I'm a bit reluctant to use the car at the moment but will take it for a run to try out your suggestion
Best regards

Robro

[GreenV8S]

If it is a heat related problem, you should be able to reproduce it on the driveway just by getting it up to temperature and trying to restart it.

[Adrian@]

Can I go back to other issues of smelling of fuel and mention that IF you have a throttle pot that is working the wrong way around (historically this is an issue with Ford 2.9's/TVR S2's even selling them (TVR and Ford) with a plug and instructions of how to rewire them)...when it is cold the car works perfectly as the with the TP telling the engine it is at full throttle it needs it liking it to a choke, THEN running at half throttle is the same BUT when you slow down it over fuels and smells of fuel (an issue before?) AND it is really hard to restart when hot. Just a thought that should be considered. A@
PS push starts are the gets you pressing the pedal to 1/2 way and that is why it starts/runs.

Edited by Adrian@ on Friday 17th May 23:40

[lewdon]

I assume that your throttle pot will not actually be wired the wrong way round as you say it has only "just started" having the problem.
But you could try taking the throttle pot out of the equation by unplugging it completely when it will not start.. This, I believe, puts the ecu into limp home mode. and it should then start if the pot is the problem..

[robro]

Thanks all for your suggestions and taking the trouble to reply.. They have given me something to work on

Best regards

Robro