Try the thermostat. The one in the cooling system. It might be stuck
closed. Your friend's Spitfire could be overheating. It wouldn't show
because the temperature sender is after the thermostat. BTDT.
Bill Kelly
dstauffa@csc.com wrote:
> Listers,
>
> I friend of mine who owns both a TR6 and Spitfire sent me this message
> about the trouble he is having with his Spitfire. I thought I would pass
> it along to the collective wisdom of this list to see if anyone has ideas.
> I know there is a Spitfire list but I'm not a subscriber. TIA, Dave
>
> ive got a great 79 spitfire Ive had since 1980. It only has 43,000
> miles on it. Its always run great although I dont drive it much, but I do
> keep it running every few weeks to keep things oiled up. Ive never had a
> dilema like my current one. Heres my problem I hope you can advise me. The
> car suddenly started running poorly. Missing when hot, particularly over
> 2500 rpm, even in neutral. So I started on the voyage to see what was
> wrong,
> thinking its probably something simple.
>
> I started with the electrical. I switched the wires, new plugs, cap, rotor.
> Then I replaced the older Crane electronic ignition with a new one. I
> swapped the coil with my TR6 and also the battery. I cleaned all the
> grounds, checked all other wiring and cleaned. No luck, so I started on the
> fuel system. Bypassed the fuel filter, and even bypassed the tank itself if
> there was a clog or bad gas etc. No luck.
>
> So I pulled the carb, cleaned it, put in new diaphragm and metering jet,
> cleaned choke. It started up nice but once warm running poorly again. no
> backfiring or anything like that. I replaced the fuel pump thinking
> pressure
> might be too low. No luck. It runs as though its starving for fuel. If I
> rev
> it up it recovers briefly, then starts to run rough again and will die if I
> let it idle. Still, whats weird is when I get it started from cold it runs
> well. Once warm is when it all starts going downhill.
>
> Here's only thing I can think of thats left>> could it be the EGR valve on
> the manifold? that thing is original and Ive never done anything with it.
> Its pretty old looking and it plugs right into the intake manifold, so it
> the diphargm (does it have one?) was leaking maybe air is getting in. The
> only other thing I can think of is the carb itself. Maybe I should replace
> it?
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