Q-jet problem update
10-06-2001, 05:56 PM
#1
Member
Thread Starter
Join Date: Jul 1999
Location: Raytown, MO
Posts: 317
Likes: 0
Received 0 Likes
on
0 Posts
Q-jet problem update
Well I was having a problem with the gas in the vacuum lines and rebuilt carb would not idle. Here is what I have found. It would run if I kept it over 2000rpm but die if I let off. I adjusted the rich screw (one in the little tower by the primaries) I got a gauge and there was only about 1mm travel. I turned it all the way and got about 2-3mm travel. It will idle when the engine is cold (at about 2000rpm) but once it warms up, it won't idle again until it cools off. The engine heats up in about 1min to the 200 degree range. ANY help GREATLY appriciated!!!
10-06-2001, 11:29 PM
#2
Supreme Member
Join Date: Jul 2001
Location: Pueblo Co
Posts: 3,974
Likes: 0
Received 0 Likes
on
0 Posts
Car: No more birdy
Sounds like it might be a bum carb.
I would turn both air and fuel mixture screws in all the way then back them both out 1 1/2 turns and work from there. 1 1/2 turns out seems to be a good base and is atually perfect for most lower cube SBC's.
Good luck!
SSC
I would turn both air and fuel mixture screws in all the way then back them both out 1 1/2 turns and work from there. 1 1/2 turns out seems to be a good base and is atually perfect for most lower cube SBC's.
Good luck!
SSC
10-08-2001, 03:28 PM
#3
Member
Join Date: Dec 1999
Location: waterford, CT 06385
Posts: 311
Likes: 0
Received 0 Likes
on
0 Posts
Did you seal the casting plugs under the float bowl with epoxy? You may have a drip if its an older carb.
------------------
1984 Z28 (L69) monochrome tangerine orange with IROC decals and hood
1987 IROC wheels with Goodyear GSC's
305 from 87 IROC with 1994 LT1 cam (203/208 .450/.460")
performer intake
Qjet from 73 Olds
dynomax cat-back, gutted cat
no emissions controls --> passed emissions testing
non WC T-5 with 0.73 5th
3.27 nine-bolt
------------------
1984 Z28 (L69) monochrome tangerine orange with IROC decals and hood
1987 IROC wheels with Goodyear GSC's
305 from 87 IROC with 1994 LT1 cam (203/208 .450/.460")
performer intake
Qjet from 73 Olds
dynomax cat-back, gutted cat
no emissions controls --> passed emissions testing
non WC T-5 with 0.73 5th
3.27 nine-bolt
10-09-2001, 08:51 AM
#4
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 35 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
That wouldn't cause gas to get into the vacuum lines (from his previous post).
Alan, I agree with the answer you got in your previous post. It really sounds like the float isn't doing its job. Before you try fiddling with it anymore from the outside, make sure it is doing the first thing it's supposed to do right - keeping the fuel level where it belongs.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
Alan, I agree with the answer you got in your previous post. It really sounds like the float isn't doing its job. Before you try fiddling with it anymore from the outside, make sure it is doing the first thing it's supposed to do right - keeping the fuel level where it belongs.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
Thread
Thread Starter
Forum
Replies
Last Post