Tvr s1 hit and miss to fire when hot and been on a run
Discussion
Hi just woundering if any body could help
I have a s1 2.8v6 and once Iv been out in it or on a run and the car is hot it dosent want to fire back up I can smell fuel whilst trying to turn the car over. I did mange to start it but had to put foot hard down on excellertaor and pump it. Just woundered if this was a common problem or a fix I could do cheers
I have a s1 2.8v6 and once Iv been out in it or on a run and the car is hot it dosent want to fire back up I can smell fuel whilst trying to turn the car over. I did mange to start it but had to put foot hard down on excellertaor and pump it. Just woundered if this was a common problem or a fix I could do cheers
A lot of problems of this sort on our cars are caused by simple wiring faults. Simple to fix that is, but a right sod to find. When it starts miss-firing again jiggle around the all wires and connectors you can find in the engine bay and see if it makes any difference. Also check your earth straps for corrosion and to see if they are tight. Check around the fuse box as well and have a look on the back for any signs of shorting out. Oh, and dont' forget to check the yellow connector under the steering column; in fact, check that first. Pull it apart, don't assume it's alright if it looks ok on the outside. Good luck.
I agree with S2Mike that the revcounter is an integral part of the ignition circuit so a faulty revcounter could well lead to faulty ignition.
However, my first suggestion is based on you saying you can smell petrol when trying to start it hot. These 6 cylinder cars have 7 injectors. The 7th is the 'cold start' injector which is to the rear of the plenum chamber above the engine, on the drivers side of the car. It should have a blue plug connector. These rely on a signal to open the solenoid on the injector when the engine is cold. That relies on the temperature sensor and the solenoid working correctly. They have quite a reputation for not doing so!
Before trying anything more difficult, disconnect the blue connector when starting the engine from hot. That may be all you need to do. In fact I ran for a long time with the blue connector off, only re-connecting it when the car was started on an unusually cold day.
If that works you still have a fault but it should be possible to live with it until you have time to do a thorough overhaul of the injection system which, believe me, is not to be undertaken lightly!
Let us know how you get on.
However, my first suggestion is based on you saying you can smell petrol when trying to start it hot. These 6 cylinder cars have 7 injectors. The 7th is the 'cold start' injector which is to the rear of the plenum chamber above the engine, on the drivers side of the car. It should have a blue plug connector. These rely on a signal to open the solenoid on the injector when the engine is cold. That relies on the temperature sensor and the solenoid working correctly. They have quite a reputation for not doing so!
Before trying anything more difficult, disconnect the blue connector when starting the engine from hot. That may be all you need to do. In fact I ran for a long time with the blue connector off, only re-connecting it when the car was started on an unusually cold day.
If that works you still have a fault but it should be possible to live with it until you have time to do a thorough overhaul of the injection system which, believe me, is not to be undertaken lightly!
Let us know how you get on.
I'd be thinking the exact same thing and as per previous comments on the other thread on your rev counter:
The Ignition circuit goes 'through' the rev counter on the S1 instead of the more familiar layout where it takes a pulse connection from the coil. When I bought my S1 (many years ago)the car would not start without putting a direct feed to the coil effectively bypassing the rev counter. I suspected the rev counter was the issue but eventually realised that the fuse was corroded in the main fuse box. Once I sorted that the engine started and the rev counter worked fine.
Knowing also now that you also have a misfiring problem I'd be heading for the fusebox and looking for corrosion and so a bad connection. Test the circuit with a good old fashioned test lamp (not a meter) so that you put some load on. And/or put a feed straight to the coil to see if the misfiring stops. It doesn't feel like you are getting the full 12v's when you are putting load on the circuit which means a bad connection. Couple that with the other issues you have had I would start at the fusebox.
The Ignition circuit goes 'through' the rev counter on the S1 instead of the more familiar layout where it takes a pulse connection from the coil. When I bought my S1 (many years ago)the car would not start without putting a direct feed to the coil effectively bypassing the rev counter. I suspected the rev counter was the issue but eventually realised that the fuse was corroded in the main fuse box. Once I sorted that the engine started and the rev counter worked fine.
Knowing also now that you also have a misfiring problem I'd be heading for the fusebox and looking for corrosion and so a bad connection. Test the circuit with a good old fashioned test lamp (not a meter) so that you put some load on. And/or put a feed straight to the coil to see if the misfiring stops. It doesn't feel like you are getting the full 12v's when you are putting load on the circuit which means a bad connection. Couple that with the other issues you have had I would start at the fusebox.
Top Gear TVR said:
dare i say a bit of carbon build up in the siamese?
You can say siamese if you please Steve, but I somehow don't think that's the problem. It's not as if he's been running on marine grade heavy fuel oil for long periods at idle.
Or has he????? There's some strange things happen at sea....... 
Either electrical or fuel metering/ injection probs in my view.
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