Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
rebuilt dualjet, now flat spot
1clnlj:
Well took it for a ride, ran great. But 20 minutes in the dreaded check engine light came on, but after 10 or so seconds it went off and did not come back on. I don't think I have seen that light come on in 35 years - other than starting. Here is the driving scenario: car ran at idle for 20 minutes and I figured I venture out with it. Did 15 minutes of city driving then hopped on the freeway. Probably went 6 miles when the CEL came on. As I got off the freeway the light went out then drove another 15 minutes home and no light. When I got home I attempted to pull the code from the diagnostic port but all I heard was a clicking noise so I stopped. How long do you have to jump the terminals to get the light to flash? Or did a code even set since the light went out? I have yet to put a dwell meter on but I suspect one of the carb settings is not quite right.
1clnlj:
Still having problems. Pulled the code - 44 lean. Is there an exact procedure to get this carb back to normal? I bought the Thexton 370 and 362 kits but have yet to punch out the plugs for external adjustment or the plugs for the mixture screws. Really didn't want to do that but is there any other way?
Ethan1:
--- Quote from: 1clnlj on May 17, 2016, 01:36:29 PM ---Still having problems. Pulled the code - 44 lean. Is there an exact procedure to get this carb back to normal? I bought the Thexton 370 and 362 kits but have yet to punch out the plugs for external adjustment or the plugs for the mixture screws. Really didn't want to do that but is there any other way?
--- End quote ---
It may be idle mixture screw related or something else. What car are we talking about here?
Ethan1:
Oh, I see, '81 Grand Prix. It says code 44 is Oxygen Sensor Circuit related. Also, any vacuum leaks? Just curious.
1clnlj:
No vacuum leaks, that I know of. Car runs great at idle and ran with no problems before rebuild, just throws the CEL. Dwell meter is at 18-27 degrees when fully warmed up. I can turn the idle mixture bleed in all the way and can't get the dwell above 27.
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