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Thermoquad idling extremely rich **UPDATE**
#349418
06/16/09 09:17 PM
06/16/09 09:17 PM
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Slantytown
DUFFMAN
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A week ago I swapped an Edlebrock 1406 for a factor 340 TQ (6139 I think) that I had just rebuilt. It was running great all weekend, then tonight the car started hard and when I did finally get it started it was running so rich it's puffing out black smoke. I took the top of the carb off, check the float height (brass floats), took the needles out inspected them and blew out the seats. I couldn't find anything wrong with it. I put it back together and it's still running rich like before. I'm not sure what to do next. 
Last edited by DUFFMAN; 06/23/09 08:49 PM.
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Re: Thermoquad running rich
[Re: DUFFMAN]
#349419
06/16/09 09:46 PM
06/16/09 09:46 PM
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Slantytown
DUFFMAN
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I'll also mention that I did swap a 14" Edlebrock air cleaner for a factory drop door air cleaner last night. (I noticed it menation as a problem on Demonsizzler's site) but the rich condition continues even with the air cleaner removed.
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Re: Thermoquad running rich
[Re: DUFFMAN]
#349420
06/16/09 09:56 PM
06/16/09 09:56 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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Is the metering rod tree being pulled down at idle
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Re: Thermoquad running rich
[Re: DUFFMAN]
#349423
06/17/09 02:45 PM
06/17/09 02:45 PM
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Posts: 11,269
Slantytown
DUFFMAN
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Here's what I'm thinking; the problem didn't start until I swapped air cleaners, so I must have bumped something in the process. The only 3 external things I can think of that would affect fuel metering are;
1. The metering rod tree. Which seems to be moving freely, but I will watch it with the engine running to make sure it pulls down.
2. Divorced choke. I can take measurements to make sure it is still adjusted properly.
3. Choke pull off. I'll hook a vacuum pump to it and make sure it's still working.
Anything else I should check?
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Re: Thermoquad running rich
[Re: 1_WILD_RT]
#349430
06/17/09 07:46 PM
06/17/09 07:46 PM
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Joined: Mar 2005
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Slantytown
DUFFMAN
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I originally used the square o-rings, when I took the top off I replaced them with the "X" style o-rings that Demonsizzler recommends using. No change with either style o-ring.
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Re: Thermoquad running rich
[Re: DUFFMAN]
#349431
06/17/09 08:55 PM
06/17/09 08:55 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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Dont give up on it yet it's gotta be something simple(it will be when you find it  )especially since it happened suddenly. More thoughts: put the old aircleaner assy back on & see what happens. maybe the underside of the lid on the new one is too close to the vents but I wouldn't think it'd cause that kind of richness. I'm wondering if one of the wells in the phenolic body sprang a(slight) leak and when you had the top off neither of the floats were waterlogged? I would take the whole carb off & go over it w a fine tooth comb. You'll have a good laugh when you spot it.
live every 24 hour block of time like it's your last day on earth
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Re: Thermoquad idling extremely rich
[Re: DUFFMAN]
#349432
06/17/09 08:59 PM
06/17/09 08:59 PM
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Joined: Jan 2003
Posts: 1,255
Columbus, GA
Michael Ecks
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Columbus, GA
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It's been a long time since I have had my hands in one. IIRC on the bottom of the bowl there are two smaller bakelite pieces glued to it to form a kind of V shape in one of the fuel passages. Those are bad to leak over time. When I was working on them we put something like JB Weld around those seams and also put a foam part from a Q-Jet in between the bottom of those V's and the base casting to keep upward pressure on the seam.
If those seams are leaky they would allow fuel to pour into the throttle bores between the bowl and the base casting.
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Re: Thermoquad running rich
[Re: DUFFMAN]
#349435
06/17/09 09:19 PM
06/17/09 09:19 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
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Today? Who Knows?
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Quote:
Quote:
I'm wondering if one of the wells in the phenolic body sprang a(slight) leak and when you had the top off neither of the floats were waterlogged?
Float bowl levels looked normal.
You'd never see a visable flaw in the wells, seperating the body while it still has fuel in it you should see a wet area.. Most experianced TQ guys just epoxy them as SOP...
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Re: Thermoquad idling extremely rich
[Re: astrobuf]
#349437
06/17/09 10:47 PM
06/17/09 10:47 PM
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Joined: Mar 2005
Posts: 11,269
Slantytown
DUFFMAN
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Well I got the Eddy bolted back up, but I didn't get it back on until after the kids went to bed so I'll have to wait until I get home from work tomorrow to fire it up.
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For the day crowd.
