I took my car in last thursday and tuned the carb to give me a 2.5% co mixture. Things really looked good on the gas analyzer. The fuel looked like it was burning fully. I took the car for a test drive and got a little bit of pinging at part throtle. I figured I just needed to change the springs in the dis. so the timing wouldn't come in so quickly. well I went with the stock springs. Now instead of light pinging at part throttle around 17-1800 rpm I get pinging any time I step on the gas while I'm crusing around. Thats evan at 2600 rpm when I know all the timing is already in. Plus I have the added joy of the car stalling on me several times this weekend when I came to a stop. Do I just need to fatten up the carb? I changed the timing setup from full manifold vacume to ported vacume and set the timing to 13*. That gives me a total of 33* I don't think this is too much with a TA212 cam at 5000 ft elevation. I should be able to run at least 35* total timing. I'm starting to wonder if I should just go with a Demon carb that I may be able to have some one tune or tune my self. No one seems to know how to tune a Q-Jet any more. That surprises me sense GM only made about a couple million of these carbs. So what do you guys think? Scrap the Q-Jet for the Demon? Or go back to tuning the old carb. Let me know all of your opinions. Thanks
it's possible you have other problems causing the pinging, maybe it's running a little warm? I didn't relize I was running to hot until I installed a gauge... or maybe carbon buildup in the heads...
