Well - the first sign of warm weather yesterday and the misfiring has re-appeared. So far I have:
Checked all the connections
Changed the fuel filter (I had a spare so that was free)
Changed the HP fuel pump (£££ doh but at least I have a spare now)
Changed the fuel delivery so that fuel is always returned to the tank after it has been through the fuel pressure regulator (no chance that it can re-circulate and overheat).
Improved the tank venting so there is no chance of any restriction.
None of these has had any effect whatsoever except on my wallet.
My current thinking is if it were the coil or other spark problem then there would be unburnt fuel exiting from the exhaust which you would smell (you can't) and also would cause a backfire (it doesn't).
So I am now thinking it's a sensor problem.
The TPS is a pretty simple, mainly mechanical, device and I can't imagine that being much affected by temperature.
The oxygen sensor is only used to fine tune the mixture (as I understand it) so I can't imagine it being that either.
So that only leaves the engine (camshaft) position sensor.- I have ordered a new one from GSF. They seem to be on special offer at the moment so the price wasn't too bad (££).
I am beggining to hate fuel injection...
Now I just have to wait and see....
As usual - any constructive suggestions welcome!
Cheers, Robin
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