CarburetorsCarb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.
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You need torx bits to disassemble the q-jet. Chances are you'll need to open it up to rebuild it, or swap in jets/rods, and some point.
Give it a shot. Bolt it onto your engine (the manifold can wait, or you can do both at the same time...), and see how it runs. You'll need to set the idle speed, and probably idle mixture. Then try driving it around town. See if you bog is gone, see how it runs, etc etc.
I'd only do the carb (not the manifold), since you *might* induce a vacuum leak if you screw up on installing the manifold, and you'll spend months chasing a "carb" problem, when it's the manifold. So, one adjustment at a time makes tuning easier.
You'll need a carburetor mixture adjustment tool. It's a handle, with a 2' long flexable neck, then a bit holder. It'll come with about 5 different bits for different carbs, you'll only use the "double D" one for the q-jet. That's how you set your idle mixture, along with a vacuum gauge.
Do a search on the forums here for "setting q-jet mixture", or idle mixture, or... you get the idea. You're probably going to want to learn some stuff about that carb.
Yes, tighten them from center outwards. There's probably a picture in your haynes manual, but go left-right-left-right, from center, outwards. If in doubt, this is always the way to do it.
oo its a lil higher but it was running on that car soo its most likely tuned i hope... so the computer lock up only works when the cars in 4th or overdrive
oo its a lil higher but it was running on that car soo its most likely tuned i hope... so the computer lock up only works when the cars in 4th or overdrive
Mine will lock up in 2nd or 3rd if the vehicle speed is above 41 mph and the engine load is low.
The carb wasn't tuned to the intake manifold, it was tuned to the engine (assuming it actually was tuned).
thanks guys for all your help yesterday i installed the intake and carb and it started rite up....i think it needs 2 be tuned because there is to much fuel getting put in how do i adjust the carb..and it still bogs
Last edited by xgtharo86x; 10-15-2006 at 11:45 AM.
thanks man my carb gasket is leaking so i bouht a new 1 and its really thin then the stock 1 is that ok and my idle keeps change on its own and i keep adjusting it to 1
yea, your idle speed is changing 'cuz you have a vacuum leak.
the carb gasket, you mean the one below the carb? Should be ~1/4" thick, if not, get another one. Might as well get a rebuild kit, $30 or so. It'll have that gasket in it, and a bunch of other parts that you may be needing in the near future.
i got a new gasket and tuned the carb and i got a lil more power but not alot and it still bogs i dont no what the bogging could be besides the fuel pump..and what should 1 do next to the motor thanks for all your help
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86' Trans Am- 85 LG4 with 77 non cc qjet elderbrock intake manifold...hedman headers( shorty style)..3" piping flowmaster 80 series..no emissions...4thgen center console..restored interior..2400watt system..700r4 with 2200 stall and corvette servo, shift kit..2.73 Posi..Torque Thrust II's.. FINALLY building my first 350
how much do you think a.shop will charge 2 tune it and i dont get The timing thing i did that already didnt i
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o and where is the air valve spring
Last edited by xgtharo86x; 10-18-2006 at 11:52 PM.
Reason: Automerged Doublepost
Seriously guy! I can't spoon feed this to you! Check the main page of TGO, and find the TECH ARTICLE called AIR VALVE ADJUSTMENT
It has a picture of how to do it!
I doubt you'll find a shop willing to tune it for you, or else it'll be $200 or so. Maybe $60, who knows, depends on how thorough they are.
I don't remember what you did, but make sure you've checked the timing.