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Riddle me this...


touchngodan
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I am restoring a '72 2002. Project started with a cracked head and toasted engine. I used a 320i engine less the injestion. I had the head rebuilt with new guides and seals. I had the carb professionally rebuilt. New wires, cap, rotor, points. using the original distributor due to vac advance broke on the 320i's dist. The problem is that the #4 hole is dead, I can unplug that plug wire and it makes no impact on the engine's already rough ride. I have measured the cam lobe in the intakes and all read equal. I have between 165 and 170 for compression on all 4 cylinders. Any Ideas out there??

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Sometimes it's the things that you would assume it can't be. I bought a '69 Triumph in '72 for $1000 because the PO couldn't diagnose the miss in the engine. The first thing I did when I bought it was to replace the plugs, even though they already looked pretty freshly installed. The problem turned out to be an internal break in one of the plugs. When I changed it, the car ran like a top from then on. I guess my advice is not to overlook the obvious things that we all tend to take for granted.

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Thanks for all the replies... I have tried swapping plugs and it has new wires cap and rotor, also I have tried both the 320 dist and the 2002 dist which do rotate the same way. The cap on the #4 intake is there and when removed does have a great deal of vacuum on it. I have rechecked the valve adjustment. Dial indicator shows the lobes on the cam have the same height. Still pondering.

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Is the plug soaked with fuel when you remove it shortly after running the engine? Did you pull plug wires one at a time after switching the plugs around?

Try all new plugs if you haven't, they're cheap...

Also, did you check that there is spark coming from the #4 wire itself? just put a screwdriver or something in it and see if it arcs to a ground on the engine somewhere whenever the engine is turned over. I have seen caps with internal breaks in them too...

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  • 1 month later...

Problem solved. After having a professional look at it and making a few adjustments to the carb wiring and adjustments, the culprit was a vacuum leak in the brake boost. I had considered this before but the prob was masked with other probs in the carb. Thank you all for the help.

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