Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Bad Leak from Baseplate Gasket

<< < (2/2)

rwberinger4x4:
Cliff - If you think this could be the problem (or if I'm running an entirely wrong gasket) Maybe I can order a care package from you.  The idle speed screw is jammed on this carb, and like an idiot I stripped it.  Luckily it stripped at about a 700-750 RPM idle, but I should probably correct it. 

Cliff Ruggles:
In all the years and tens of thousands of q-jets I've worked with never once have I seen a stripped out idle speed screw.  I've had a few that were seized up there, but with some heat and penetrating oil they always came out fine.

Are you running PCV on that engine?  I noticed a makeshift plug on the PCV line on the carburetor.

That gasket should seal fine on that intake.....Cliff

rwberinger4x4:

--- Quote from: Cliff Ruggles on April 21, 2016, 02:44:35 AM ---In all the years and tens of thousands of q-jets I've worked with never once have I seen a stripped out idle speed screw.  I've had a few that were seized up there, but with some heat and penetrating oil they always came out fine.

Are you running PCV on that engine?  I noticed a makeshift plug on the PCV line on the carburetor.

That gasket should seal fine on that intake.....Cliff

--- End quote ---

Hey Cliff - No PCV - but I need to add one.  The engine spews blowby out the breathers, currently.  The whole driveline is being pulled out of the truck later this summer for an overhaul.  It has been running one breather on each valve cover since I bought it.  I'm sure crankcase pressure is high.

As for the idle screw - yeah it blows my mind, especially because the screw WILL turn, about 2-2.5 turns in either direction.  however, it won't back all the way out, and it won't go more than about halfway in.  It's almost like it was "staked" to prevent it from going beyond that, but I haven't pulled the engine yet to look at the screw threads. 
Nonetheless - is this something you sell?  I haven't been able to find someone who will just sell an idle mixture screw.  Otherwise, I'll go core hunting. 

Lastly, for the base gasket - if this looks like the correct gasket for the application, any suggestion on getting a better seal?  Is it a matter of decking the intake to ensure it's level?  The carb base doesn't appear to be warped and the throttle shafts are already bushed.

429bbf:
as far as the idle screw goes try screw it in as for as possible, take a cutoff wheel and cut it  off and you should be able to get it out.tap the hole and it should be good . if you can't find one give me your address and ill send one to you. hth

Cliff Ruggles:
Idle speed screw or idle mixture screw?

We sell both, and every carb to intake gasket made for a q-jet.....Cliff

Navigation

[0] Message Index

[*] Previous page