Cold Drive Q-jet issues - Team Camaro Tech
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post #1 of 4 (permalink) Old Feb 7th, 06, 04:45 AM Thread Starter
Senior Tech
Join Date: Jan 2001
Location: Raleigh, NC
Posts: 1,046
Cold Drive Q-jet issues

Hey ... Have a Edelbrock 1904 ... I have run this carb on a stock rebuld 67 Chevelle ss 396 325 hp 4spd and now on a 55 chevy 96 vortec engine comp cam XR276 roller cam, headers ... 4spd ... balanced, ported heads, etc ...
On each engine, on cold starts, the cars start and idles fine ... the choke is operative ... however, when I initially begin the drive, it is almost like a studder until the engines get good and warm ... I plan to get a rebuild kit and go through the carb. I am looking for reasons for the studder ... Also, if I want to be a little richer in cruise mode, should I look at metering rods or jets? ... I want to run on the 55 with as much advance as I can get and I want to avoid lean cruise surging ... Tried a crane adj vacuum advance and the motor stumbled hard whenever vacuum was applied to canister, even at idle ...I took it back out Thanks in advance for any suggestions ...
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post #2 of 4 (permalink) Old Feb 7th, 06, 10:22 PM
Join Date: Nov 2001
Posts: 138
Re: Cold Drive Q-jet issues

Set your choke a little tighter--too lean when it is cold.
jhow66 is offline  
post #3 of 4 (permalink) Old Feb 8th, 06, 07:50 AM
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Re: Cold Drive Q-jet issues

Also, if I want to be a little richer in cruise mode, should I look at metering rods or jets?
Smaller rods.
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post #4 of 4 (permalink) Old Feb 8th, 06, 04:23 PM
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Location: LaGrange,Il
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Re: Cold Drive Q-jet issues

There are a lot of adjustments that can tune a Q-jet. This links to a lot of info. First rebuild and make sure the float is good and at the correct level. You can try a slight APT adjustment first. A smaller primary metering rod might help. Be sure to RECORD EVERY MOVE ONE AT A TIME. Make sure the power piston spring is correct for your engine. Read thru the info it should help.


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