Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Too Rich Idle,Cadillac 500

(1/2) > >>

78GMCMH:
Thank You for the great book and excellent rebuild kit. Having a problem with my GMC motorhome. Swapped out the 403 for a .020 over 507 Cadillac. When I try to adjust the idle air screws it idles poorly and will not stall with them all the way in. Afr reads very rich when all the way in, 12.5 to 1. Idle worsens the father out they are. Meter confirms that it gets even richer. I,m lean at part throttle and it stumbles when I give it more throttle, but I'm working on that. More worried about the idle. Since its a MH and we do spend time in campgrounds where people are asleep when we're leaving and its early,,,good idle is important. I'm using a 1984 carb of a P30 454 MH. #17080212, second line,1444CPW.
Cam.  Comp    202 int.    212 ex. on a 110 ctr. line (should have orderd on a 112 or 114)
Idle tube   .037
Idle down channel   .046
Lower idle air bleed   .056
Idle bypass air   .110
Mixture screw holes   .064
Main air bleeds   .052
Idle air bleeds   .067-.068
Main jets   72
I have in stock hangers,,D,,K,,M,,O,,P and rods,,CH,,CV,,CG,,DR,,DP,,CP,,DD although some of those are really fat.
 I spoke to you on the phone about this build along time ago and the carb # and date was unusual. It was off a 1984 454 P30 33 foot motorhome.Thank you for your time,,,,PL

78GMCMH:
Opps,,,primary rods are .026 tip,,,41B.....thanks,,PL

78GMCMH:
Again,,,sorry. Was looking at the 72 Caddy rods. The ones I'm using are "54V". Hard to tell if the V is a Y or not though,,,,but the tip is .036,,,,PL

Cliff Ruggles:
Those are the motorhome metering rods more than likely. They have a long taper for the upper section.  You will need larger jets to effectively use them in that carburetor.  72's will be pretty lean.....Cliff

78GMCMH:
Thanks Cliff,,,I'll go up on the 72's to 73 or 74's. But how do I get the idle to improve???

Navigation

[0] Message Index

[#] Next page