bluejaso

Hi guys! Thanks for your input! So the new plugs are fouled and I suspect that the issue is fuel delivery. Is there something i can read and review to reduce the fuel? Also, as we experiment, do we always need new plugs just to be safe?

Some success last night. The new spark plugs were black - carbon all over. I replaced them, went for a 45 minute run and the car ran awesome. No issues whatsoever. Afterwards I took a look at the plugs. Black all over and scored somewhat. See below What could be the cause? Should I get different plugs with a different heat range?

Hi guys: Thanks for the replies! 1. I disconnected the fuel pump line going to the carbs and pumped fuel into a plastic bottle. From what I can tell, the fuel looks clean. 2. I went to two different gas stations to answer Olzed comment. 3. TBone028, popping is coming from the carbs from 2500 rpm and up. It's coming from the front the most. 4. The carbs were rejetted. There was a flame coming out of that front carb and with the new jets, it runs a bit leaner which solved the flame problem. Perhaps as a precaution, changing the fuel filters is my next step. Thank you guys!

Hi everyone: I have a great mechanic that knows Z's who built my car and has done some recent work on it. He's totally perplexed by this problem. Last year, the car would bog with light acceleration. In attempt to fix it this year, this is what has been done: oil change oil filter change new spark plugs install of an electronic fuel pump install of electronic ignition After this was done, the car ran beautifully. Smooth acceleration, no stalling on stops, for two trips - driving home and the next morning on the way to a golf course out of town. Two things happend - I filled the car with premium fuel (as usual) and we had a flash rain storm. On the way home the car started to pop and bog. The popping never happend before this. I took the car back to my mechanic. Perplexed, he tested the fuel pump and put in new wires. Afterwards, it ran fine to a trip back to the gas station. Filled it up, then we have the problem again. it pops and bogs and stalls out on stops. Bear with me, I'm still getting to know the car; my mechanic is the expert. I'll learn quick and I am super motivated to fix this and drive my Z. Some info on the engine: 71 240 Z Triple Weber Carb set up on a 280Z motor 82 280Z plugs Racing cam Flat top pistons I have a video while driving - sorry that it is poor quality. Anyone have any ideas?