kakapoopie Posted August 4, 2009 Share Posted August 4, 2009 (edited) Hi everyone, I have a 1971 240z with an L28 (N42) block and E88 head. The PO said it had been sitting for two years and it had a valve lash pop off due to sticky oil that I fixed. I also just redid the fuel system (newish 280z tank, new hoses, pump, filter. Carburetor float needles were stuck closed, but I soaked them in carb cleaner and they move freely now, cleaned the banjo fitting mesh filter. Also adjusted float level, timing and valve clearance as per FSM. Here is a video of the car idling Now to the problem. The car is idling very rough, engine is shaking, there is a loud clicking noise coming from somewhere and pulling spark plugs doesn't have much if any effect on the first 3 cylinders So after switching plugs 3/4 and seeing a difference, I decided to try out all new plugs. I put them in, and #2-6 passed the plug test, while #1 failed. Pulled #1 plug and it looked like no fuel at all had gone near it, and there was a slow white smoke coming out of the plug hole (not steam). Now after about 5 minutes of running, it seems the new plugs have started to foul again. Car is back to running like how it was with the old plugs. Here is pictures of the old and new plugs (kind of erratic pattern of fouling on the new set) Old New Any thoughts? Edited August 4, 2009 by kakapoopie title change Quote Link to comment Share on other sites More sharing options...
tech9 Posted August 5, 2009 Share Posted August 5, 2009 For some reason the noise you hear sounds like timing chain? Have a stethoscope you can figure where the sound is coming from? Also don't waste your money on those plugs, just get a copper core one, esp while testing! Quote Link to comment Share on other sites More sharing options...
Challenger Posted August 5, 2009 Share Posted August 5, 2009 Is it running to rich? What kind of fuel pump? Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted August 5, 2009 Author Share Posted August 5, 2009 tech - I have a stethoscope, didn't think to check the chain, thanks for the tip. And trust me I didn't want to buy those plugs, but they were the cheapest they had in stock. Challenger - I think it is running rich..there is also a tiny pool of fuel that always gathers on the opening of the front carb. It's got a stock replacement mechanical pump Quote Link to comment Share on other sites More sharing options...
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