I really hope that this doesn't result in a bunch or search for the answer message. I tried that the advice i've read seems to be the same and doesn't quite match my situation.

I recently bought a 1984 trans am. Right now i believe that it is running great in my opinion but their are little problems that keep poping up... For one the moter that is in it is to the best of my knowledge a 1986 LG4 and transmition with a computer controled q-jet. The q-jet is newly or recently remanufactured by holly as the stickers that are on it are still bright and colorful. I've only had the vehicle for a couple of weeks so i really don't know it all that well yet. But the first problem I've run into is that it likes to start up at a high idle(2500-3000) and won't slow down even if i let it warm up a while and then give it a little more gas. I've slowed down the idle plunger some and it helps after its warm and turned back on again. then it idles in the 1000-1500 range anyting slower than that and the choke kicks in and the idle is rather eratic even to the point of dieing. Of course this may be fixable I've noticed that the temp sensor on the block appears damaged. and So does the second one. Also the electric fan to my knowledge doesn't turn on automaticly but it will work when the a/c is in the on position even thought the a/c doesn't work. One more thing it has been previously modified with a 4.31 rear end and a true dual exhaust and no cats.

 

Also still has air pump, egr equip hooked up just no cat.

Now that you kind of know what i'm dealing with I want to know is if i just get rid of the whole cc carb and emitions and replace it with even a non cc q-jet and vac advance distributor. Will it gain me a better performing vehicle. Not just in power performance but also less problematic. I'm not realling looking to spend loads of money to get a high power engine just something that will be simple to troubleshoot and fix especally in this situation where it isn't stock anymore anyway. But i don't wan't to screw my gas milage either since even with this low differeintial i'd been getting 19-20 mpg even driving 65 at about 3300 rpm. Just anything i can do to make it simpler since all the emition equip is basicly a jubbled mess about the engine bay.

Any comments or advice would be greatly appriciated. Sorry for the long post but i'm hoping th more info you have the better sugestions i'll get.

 

Just to let you know what i did. my quadrajunk crapped out on me so i decided to just buy a edelbrock performer series carb 600cfm part # is 1406. i had to buy an adapter plate so i could put the square bore carb on a spread bore intake, an air cleaner, and a vacuum advanced distributor. once i worked it all out and it was running good, i pulled that "jubbled mess" out of the engine bay and i am still getting 18-20 mpg!

 

The problem may be with your electric choke. either its bad and needs to be replaced or it needs to be adjusted. Any body else have any ideas?

 

Yeah, check your choke adjustment and look for vacuum leaks. Don't ditch the ccc-qjet yet, it will serve you well. Your temp sensors on the block are actually on the cylinder heads. The driver's side runs to the dash and the passenger side sensor to the fan(?). The temp sensor for the ecm is on the intake water neck. Is the car idling high with the choke blade at 90 degrees and the throttle resting on the idle adjustment screw? Also when you turn on the a/c switch the throttle kicker will activate lifting the throttle off of the idle adjustment screw. You can disconnect it if you're using the a/c switch solely to run the radiator fan.

 

On the other hand he has a point! my car did run pretty strong before i chunked the carb! ( some solenoid went out on it. dont recall right of hand what it was called. but it ran rich all the time when it went out! )

 

I'll have to go check a little more into it. I don't believe that the choke vane is all the way at 90 degrees when its in high idle but most of my looking has been after the engine is warm. So i don't exactly know. I'll try and unplug the throttle kicker and see what that will do to the high idle. Thanks for the info so far it gives me a good place to start looking.

 

I looked at my carb this afternoon and the problem must be with the electronic choke it wasn't fully at 90 as soon as i messed with it and got the choke to dissengage it idled down to 1000. tried it again later tonight after the engine had been off for several hours and the choke kicked in but then it must have worked and kicked itself off. Thanks for the help

 

Anytime!

 

Give your choke linkage a good cleaning with some carb cleaner and see if that keeps it functioning correctly. Good luck.