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View Full Version : Looking for someone who knows how to tune these


L695speed
05-01-2010, 08:17 AM
I'm looking for someone (other than the dealership) who knows how to tune CC QJets and can do it blind. I've been having little BS issues, while most is the result of the car sitting for 7 years, some could be due to the fact that when the carb was rebuilt (I did it), I never was able to nail down the final tuning so the carb is just right. For anyone who might know the solution, I pulled a 44 trouble code on the car, after a 15 mile run, running an L69 carb on an 87 LG4.

Also I'd love to take it to the chatterbox tonight but I'm on the fence as the Chatterbox is on the outside limit of how far you can go before issues start popping up. However, since these cars seem to reset every few times you start it I think the car might be ok for the 10 mile run to and from the chatterbox.

TaKid455
05-02-2010, 08:16 PM
the CC carbs are not much different than regular Qjets as far as function is concerned. still has jets, rods and adjusting screws for mixture related adjustments. the computer only controls the idle and early primary mixture. when the ECU craps out (and they do) the carb defaults to a rich setting. A way to check the CC functions on the carb to see if they are working is to unplug it (plug by accelerator pump) and see what happens, it should run rich. code 44 comes up as a lean mixture. there is a APT adjustment which can be adjusted to manually richen the idle and low speed mixture. should be 3-4.5 turns out depending on application and source. it can be accessed w/o tearing the carb apart if the cap was drilled. it was sealed from the factory. this there are a few things that are suggested to do by the factory manuals when rebuilding. At that point you might as well rebuild the carb as its mostly apart anyway.

I recall your engine in mostly stock so while playing w/ jets and rods may see slight performance gains, your car should run decent w/ the factory settings.

hope this helps.