Accel pump q-jet
Thread Starter
Racer
Joined: Nov 2011
Posts: 374
Likes: 21
From: Charleston SC
Accel pump q-jet
I rebuilt my Rochester Q-jet but haven't installed it yet. Apparently it has been reworked before (Lars maybe? -- JUST JOKING) because somebody had tie-wrapped part of the choke mechanism (as per pic).
I know the left side of the tie-wrap is in the position it was in, but don't have a "for sure" idea where the other end was. It was hidden when I took the "before" pic and kinda fell apart when I undid the screw. Why was it done in the first place, and what do I need to do to fix it right? Thanks, Bill
I know the left side of the tie-wrap is in the position it was in, but don't have a "for sure" idea where the other end was. It was hidden when I took the "before" pic and kinda fell apart when I undid the screw. Why was it done in the first place, and what do I need to do to fix it right? Thanks, Bill
Tech Contributor
Joined: Aug 1999
Posts: 14,379
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
To fix it right, you cut the tie wrap off. It was done to retract the secondary lockout lever, because whoever did it didn't know how it worked. If your choke is hooked up and operational, the lever will retract on its own when the engine warms up and the choke opens.
Lars
Lars
Thread Starter
Racer
Joined: Nov 2011
Posts: 374
Likes: 21
From: Charleston SC
Lars, I appreciate the prompt answer. Is there any way I can find out if the choke is working without putting it on the car? Also, re: attach pic, what is that brown thing. (I appologize for such dumb questions but I'm just a kid (70 last Sunday) and gotta learn somehow.)
Thanks again and brgds, Bill
Thanks again and brgds, Bill
Melting Slicks
Joined: Mar 2007
Posts: 2,520
Likes: 11
From: Hinckley OH
That's an idle speed solenoid. It has one of two uses. Some air conditioned cars have it to bump up the idle speed when the A/C is on. Some other cars use it as an anti-dieseling device. In that case, it bumps up the idle speed when the car is running and it retracts when the key is shut off which shuts off the gas supply to prevent runon.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The best reference source for setting up your Q-Jet choke system (and other Q-Jet settings and adjustments) is the Chevrolet Chassis Service Manual for the year that Q-Jet was assembled to it's parent vehicle. [If it came on your car, then for your model year. But, if it was originally assembled to a 70 Chevelle, then the 1970 Chev. Chassis Service Manual will have the correct information for the carb.]
The instructions are very clear and easily followed, IF you actually perform the steps listed completely and in the order given. You should take digital photos of the choke mechanism and linkages before disassembly so that you have a good reference for rebuild. You also will need to clean all components well so that they will operate freely when reassembled. DO NOT put any kind of paint on the choke parts, as that will reduce clearances, freedom of part motion, and cause parts to stick/not operate properly.
The instructions are very clear and easily followed, IF you actually perform the steps listed completely and in the order given. You should take digital photos of the choke mechanism and linkages before disassembly so that you have a good reference for rebuild. You also will need to clean all components well so that they will operate freely when reassembled. DO NOT put any kind of paint on the choke parts, as that will reduce clearances, freedom of part motion, and cause parts to stick/not operate properly.
Tech Contributor
Joined: Aug 1999
Posts: 14,379
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Your carb is a divorced choke carb, so there is nothing that can not work with regards to the choke on the carb: As long as the linkages are correctly adjusted (and not disabled as shown in your photo), the choke will work when hooked up to a properly operating divorced choke coil. Open the throttle and pull down on the attach point for the divorced choke rod - the choke should fully close. Suck on the choke pulloff - it should retract, hold vacuum, and crack the choke open 1/4". Set the carb linkages up as outlined in my Q-Jet Setup Paper - there is a complete section devoted to adjusting and setting up both the divorced and integral choke systems. You can also send the carb to me and I'll set it up and test it for you. Just e-mail me for a copy of the paper or for services info.
Lars
V8FastCars@msn.com
Last edited by lars; Nov 10, 2012 at 10:54 AM.
