cj79 Posted April 9, 2015 Report Share Posted April 9, 2015 Hi All, I've just got my Historic Status so got the car out on the road this last weekend.. I put brand new sparks in before starting this year, the MU was brand new last year and setup by Malcolm Jones, engine is completely restored professionally, all fuel lines (inc tank) are brand new last year. The problem is, I'm replacing the sparks every couple of months (I know I could clean them but they're not expensive and it's easier to put in new ones) .. they are getting heavily sooted up to the point where I can't get the engine to fire, the car pulls well to about 4.5k revs then seems to top out in each gear, when I floor it there is a momentary loss of power before it takes off, there is a popping coming from unburnt fuel in the exhaust on lift off, umm.. what else.. I've checked the enrichment lever returns completely to its off position and the car runs fairly well with no choke after a couple of mins, it's taking a lot of cranking to start each time though, all the hoses and brake servo etc are brand new, injectors are brand new replacements for the dodgy leaking ones I got on eBay originally (new ones are from Moss). Does any of this sound like multiple symptoms of a common problem I could look for or would it be best to just get the car to TRBitz and be done with looking? Many thanks,Chris Quote Link to post Share on other sites
john.r.davies Posted April 9, 2015 Report Share Posted April 9, 2015 Vacuum leak to MU? That'll make it run rich. But Malcolm and others always set up the MU to run rich, else it will go lean at top end. JOhn Quote Link to post Share on other sites
Peter Cobbold Posted April 9, 2015 Report Share Posted April 9, 2015 (edited) Wont go over at 4500rpm? Check the spark timing. Static should be approx12btdc Most of those symptoms could result from over-retarded spark: sooty plugs, hesitation upon wot, exhaust popping on over-run. Edited April 9, 2015 by Peter Cobbold Quote Link to post Share on other sites
barkerwilliams Posted April 9, 2015 Report Share Posted April 9, 2015 Have you tried testing with the air filter to induction manifold interconnecting pipe disconnected so the engine can breath without restriction? But filter would have to be really really bad. Quote Link to post Share on other sites
cj79 Posted April 10, 2015 Author Report Share Posted April 10, 2015 I don't think there should be a vacuum leak as everything is almost new (including the filter so I think that rules out disconnecting the pipe from the air box too), I'll check both though. In terms of engine timing, i've got it set to 11btdc as per the instructions for the fast road cam I had put in, I checked the timing with the strobe yesterday and it's right on the line. I can try backing it off a fraction and see what results I get though, i'll let you know if this afternoon is as sunny as yesterday Cheers Quote Link to post Share on other sites
Tim D. Posted April 10, 2015 Report Share Posted April 10, 2015 Do you mean 11 btdc static? Cheers Tim Quote Link to post Share on other sites
peejay4A Posted April 10, 2015 Report Share Posted April 10, 2015 Going back a few steps, was it running OK before putting it to bed? Quote Link to post Share on other sites
Peter Cobbold Posted April 10, 2015 Report Share Posted April 10, 2015 Could also be points gap closed up. Plastic ones wear very quickly if fitted dry. Quote Link to post Share on other sites
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