Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Idle problem
dlphil10:
If it is set to about 1 -1.5 turns from lightly seated it loads up at idle, but it seems to run better the more I turn the screws out.
Cliff Ruggles:
Do the same idle test you did earlier by putting your hand over the front of the carb at idle speed, or gently closing the choke flap. If the engine speeds up or smooths out, it still wants more idle fuel. Next step would be to open up the DCR"s slightly......Cliff
dlphil10:
I finally got to where I can work on it more. It runs without spark knock under load or cruising so I'm assuming the slight flub and irregular spark knock at idle is due to the lean carb setting. What idle down tube restriction size would you recommend for my setup?
Cliff Ruggles:
.046" to start with, if that doesn't bring in enough fuel open them up to .052".....Cliff
dlphil10:
So I've got it to where it appears to not want any more fuel by the hand over the choke method. However, it still seems to have a slight miss, it was cleared up considerably with the carb adjustment. Could a warped air horn or bad air horn gasket be causing the issue? All cylinders are firing evenly, the plugs all look good and exactly the same. Manifold vac is rock steady at roughly 14 or 15inHg.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version