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steveeoaktree posted a question in Pontiac Questions and ConcernsWell fellas, I will finally have some more time Saturday to get to tweaking the issues with the '76 GP's idle/accel issues. Started with running terrible and popping back through the carb. After a new fuel pump (smelled fuel in the oil), wix inline filter and new lines, and 2 Rochester carb rebuilds (soaked the parts overnight in the carb solvent the 2nd time as well as installing a new brass float), re gapped the new plugs to .045 that were gapped at .080 by the seller, new vaccum lines, and I also have the new pcv valve and lines (there wasn't one) to install Sat. It now accelerates MUCH better, but idles like it wants to die at stoplights (and does die sometimes) but starts right back up. I thought maybe to tweak the vaccum lines to see how they work best b/c some diagrams show a "t" going to the vac advance with one going to the manifold, and the other going to the carb... and some diagrams just show a single line to the carb. I also don't know it the missing pcv would cause any minor idling or accelerating issues, but I do know that it should be there. the timing is solid. I am going to drain the tank again and refill it with 89 octane fuel to also see if that helps. I am curious though, as it seems to only try to die after it's warmed up. I know there is a choke internal in the intake but it's tough to find a diagram specific enough to list all of the line connections for a 1976 400 2bbl... (most show them for the 4 bbl) If any of y'all have any tips, I'll surely give them a try either tomorrow after work, or Saturday when I do the rest... Have interior pieces to dye inbetween as well so it should be a great Poncho day -- just would feel much better if I could get this baby to run smooth! She's sooo close... Thank y'all for your time, and all of the guidance that you've given. Stevee
steveeoaktree posted a question in Pontiac Questions and ConcernsHere I am again turning to the experts... I methodically went through everything that I thought was necessary on a vehicle that is 40 years old and had sat for a while.. New plugs, cap, rotor, carb rebuild, fuel pump, oil change (and filter), and some seafoam in the tank along with adding a few gallons of fresh fuel. She's still "popping" or "stumbling" when I open the throttle. Runs perfectly smooth at idle, and "cruise" speeds. It's possible I reckon that I could've got the float drop set wrong or the float level..? I also am going to check the dizzy tomorrow along with checking all vac lines with the best diagram that I have so far... Fuel filter has also been changed. Due to how smooth it runs normally, I was trying to avoid looking into any serious valvetrain issues, well and the fact it has only 66,000 on her. I don't really know the tendencies or weaknesses of these particular years' of engines though. Any direction is appreciates! I was considering possibly there may be build up on the valves? Stevee