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Re: Thermoquad idling extremely rich
[Re: DUFFMAN]
#349438
06/17/09 11:02 PM
06/17/09 11:02 PM
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Joined: Mar 2008
Posts: 571
Western NC
68Bullit
mopar
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mopar
Joined: Mar 2008
Posts: 571
Western NC
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Quote:
I'm afraid I've seen this problem with my TQ. The problem turned out to be high fuel pump pressure. I was running at 5-6 psi and this was enough to push the needles off the seats. The problem only occurs when the engines running and the high bowl level ends up spilling fuel from the bleeds into the throttle bores. It makes the car run really rich and unresponsive to idel screw adjustments.
To fix this, I ended up plumbing in a fuel pressure regulator and dropping pressure to 3.5 psi. Problem solved!
I think this would be VERY worth checking out. I talked with DemonSizzler about this very thing and we agreed that it couldn't hurt to add a regulator just to be sure.
My TQ is doing the exact same thing BTW, and I haven't taken anything apart yet. DemonSizzler just sent me this carb and it looks great, and I'm also confident that it has been prepped sufficiently.
Think about this. If you go back to your Eddy carb, and it runs fine, I still wouldn't discount that if your fuel pressure is high, that one carb may do fine (though probably temporarily), while the other one runs overly rich (This case being the TQ) 
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Re: Thermoquad idling extremely rich
[Re: 68Bullit]
#349439
06/17/09 11:11 PM
06/17/09 11:11 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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It happened all of a sudden which makes me think leaking wells rather than the psi suddenly going higher, if it's not regulated now there is no regulator to fail to let the psi go higher, that & when it happened it also would not start so I dont think excessive psi would come from a fuel pump at cranking speed. . If the wells spring a minute leak it would flood it & make it hard to start & when it does start it'd be way rich as described.
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: RapidRobert]
#349440
06/18/09 08:45 AM
06/18/09 08:45 AM
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Joined: Mar 2005
Posts: 11,269
Slantytown
DUFFMAN
OP
Ask And Ye Shall Receive
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OP
Ask And Ye Shall Receive
Joined: Mar 2005
Posts: 11,269
Slantytown
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I'm not giving up on the TQ just swapping for the Eddy for right now. First, to make sure that the problem is with the carb and not something else. Second, since the car is my weekend cruiser, and the weekend is almost here, so I want it drivable again.
No longer taking $h!t from anyone!
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Re: Thermoquad idling extremely rich
[Re: boydsdodge]
#349444
06/18/09 07:05 PM
06/18/09 07:05 PM
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Joined: Mar 2005
Posts: 11,269
Slantytown
DUFFMAN
OP
Ask And Ye Shall Receive
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OP
Ask And Ye Shall Receive
Joined: Mar 2005
Posts: 11,269
Slantytown
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It's running great with the Eddy, so there is definetely something wrong with the TQ.
No longer taking $h!t from anyone!
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Re: Thermoquad idling extremely rich
[Re: DUFFMAN]
#349445
06/19/09 07:02 AM
06/19/09 07:02 AM
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Joined: Mar 2005
Posts: 11,269
Slantytown
DUFFMAN
OP
Ask And Ye Shall Receive
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OP
Ask And Ye Shall Receive
Joined: Mar 2005
Posts: 11,269
Slantytown
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Whatever the problem is it requires vacuum. The carb has been sitting on my work bench now for 1.5 days full of gas and hasen't leaked anything.
I still want to find the problem and fix it because I would like the stock appearence and it has better throttle response than the Eddy.
No longer taking $h!t from anyone!
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Re: Thermoquad idling extremely rich
[Re: DUFFMAN]
#349446
06/19/09 07:16 AM
06/19/09 07:16 AM
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Joined: Jan 2003
Posts: 826
Stone Mt, GA.
DEMONSIZZLER
super gas
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super gas
Joined: Jan 2003
Posts: 826
Stone Mt, GA.
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More than likely, either the needle seat(s) is/are not tight enough in the top and the float bowls are over-filling or a float is defective and taking in gas(only if it feels heavier than it should and you probably already know it is not)or you are missing one or both of the seat gaskets. Float level too high is the last possibility, David.
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New parts for all OEM 1971-1984, Competition Series and SuperQuad carbs and custom fabricating.
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so you get the right carb the first time.
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Re: Thermoquad idling extremely rich
[Re: DEMONSIZZLER]
#349447
06/19/09 08:50 AM
06/19/09 08:50 AM
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Joined: Mar 2005
Posts: 11,269
Slantytown
DUFFMAN
OP
Ask And Ye Shall Receive
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OP
Ask And Ye Shall Receive
Joined: Mar 2005
Posts: 11,269
Slantytown
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This happened suddenly. So is it possible that that one of the seats loosened up? When this all first started I took the top off, checked the float level and inspected the needles and seats (which are new). I noticed some brass shavings in the bottom of the passenger's side bowl so I cleaned them out. Maybe I have a defective seat? 
No longer taking $h!t from anyone!
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Re: Thermoquad idling extremely rich
[Re: DUFFMAN]
#349449
06/23/09 10:01 PM
06/23/09 10:01 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
More than likely, either the needle seat(s) is/are not tight enough in the top and the float bowls are over-filling or a float is defective and taking in gas(only if it feels heavier than it should and you probably already know it is not)or you are missing one or both of the seat gaskets. Float level too high is the last possibility, David.
Over the weekend I openned the TQ up and noticed brass shavings in the bowl again. So I swapped the needle seats with the old ones and reset the float height.
Tonight I put the TQ back on and it's not running rich anymore, but I still have a problem, I still can't get it to idle below 850 rpm without it dying and after I peg the throttle it settles back down to around 1000 rpm even if I push the throttle closed. I also noticed the choke plate isn't openning fully.
sounds like a vaccuum leak
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