evildky Posted March 5, 2004 Share Posted March 5, 2004 I have driven myself nuts trying to figure this out, I have a 71 240z origional engine, it bogs down once it gets good and warmed up, not overheating just at normal operating temp, I can be tooling along or racing, reving 5000 in second, and it just starts to bog, I shift to third and it bogs at 3500 rpm, speed seems to be the limiter ? I have replaced the points dist with an electronic unit from a 78 and added an aftermarket coil and an MSD 6T, I replaced the factory SU's with a set I got from a totaled IT car, the problem remains, I replaced the fuel pump with a holly red and a FPR, the problem persists, I adjusted the valves it still does it ? I am banging my head, not likely to have 2 sets of bad carbs, not likely to have 2 bad distributor, I am out of stuff to replace, any ideas? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted March 5, 2004 Share Posted March 5, 2004 I could be WAAAY off base here, but isn't the 6T the turbo model that retards timing as rpms come up? If your timing were getting retarded you would definitely lose power. Other than that I would suspect a clogged fuel filter or some other fuel problem. Jon Quote Link to comment Share on other sites More sharing options...
evildky Posted March 5, 2004 Author Share Posted March 5, 2004 no the 6t is the model for trucks, it cames with the vibration feet, other than that it's like the 6A Quote Link to comment Share on other sites More sharing options...
BillZ260 Posted March 5, 2004 Share Posted March 5, 2004 first things first, but i suppose you already looked at your air filter. Could be a leaf or somehting in the airway.. Quote Link to comment Share on other sites More sharing options...
evildky Posted March 6, 2004 Author Share Posted March 6, 2004 lol, I have no air filter, just the carb's and the backing plate, the cover just gets in the way when working on it, any other ideas ? I am fresh out and frustrated as hell Quote Link to comment Share on other sites More sharing options...
datsunlover Posted March 6, 2004 Share Posted March 6, 2004 Hmm.. does your dizzy have a vacume advance on it? Might be an issue there... Quote Link to comment Share on other sites More sharing options...
evildky Posted March 6, 2004 Author Share Posted March 6, 2004 yup I had a vac advance on the points dist, tried it at all val, no vac, and timed vac, did the same with the electronic unit, no change Quote Link to comment Share on other sites More sharing options...
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