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I've tried resetting the idle bleeds everywhere from 1.5 to 3.0 turns off their seats, and all I get is a "hunting" idle, that gradually gets worse as the engine warms up. Then eventually it stalls.


And THANKS!!!

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Contact your builder. If it's the same thermoquad guy I praise, I have no doubt he'll solve your problem and get you up and running like a champ. TQ's are great carbs once you get them dialed in.

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On my TQ 1.5-3 turns out on the idle screws is nothing.

When you get it running, press down on the accel pump arm and let the spring shoot fuel without touching the throttle shaft.

If it runs better right after the shot, you should back out the idle screws more.

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Now, THAT's interesting.... some other comments I'd picked up were telling me that I might already be too far out / too rich. Thanks for another view, and your experience!

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So, what baseplate gasket are you using?

How did the engine run before?

You say its been sitting a 'couple of months' without use, was it actually a couple of months, or more like a year?

I could think of a couple of internal issues that would cause hunting, but, you shouldn't have them on a 'fresh' carb.

Along the lines of internal issues, what kind of gas are you using? Any additives? (thinking maybe a gasket was damaged by chemical reaction).

TQ's aren't that hard once you get over the initial fear of the unknown.

For that matter, how much experience do you have working on any carb??

Hope I haven't asked too many questions.

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I'll answer your questions in reverse order.

#4: Not much. I've swapped out and set idle mix and base idle on probably a half dozen "stock replacement carbs over thirty odd years. swapped out the TQuad on my '74 dodge motorhome's 440 for a rebuilt from a generic auto parts house about five years ago. Bolted it on, hooked up the hoses and drove it, but that's the only TQ I've ever laid tools on.

#3: regular 87 octane pump gas (Shell, I think) with no additives).

#2: From the date of my last emails to and from David, I got the carb right around Christmas last year, so call it five months on the shelf.

#1: The engine ran "OK" with the eddy 1406. No off idle stumble or flat spots. With the tranny kickdown linkage FUBAR, I hadn't pushed the car really hard, but a couple of times, for fear of damaging the tranny. With no kickdown functioning, acceleration was less than thrilling on the street, but "adequate" on the hiway.

The performance with the TQuad IS thrilling, once I get it past the bog. When the the engine starts to wind up, and the secondaries open wide, i LOVE the moan/howl! The kick in the pants when the tranny kicks down is a HOOT after three years of no such luck. Now if i could just get it to idle down, and come off idle like it comes on the secondaries I'd have a PERMANENT grin from ear to ear!

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...I've been thinking vacuum leak, but can't find one with the rubber hose :stethoscope trick.

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Can't change the idle spraying carb cleaner around the carb base. I've tried resetting the idle bleeds everywhere from 1.5 to 3.0 turns off their seats, and all I get is a "hunting" idle, that gradually gets worse as the engine warms up. Then eventually it stalls.

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I did a search of the site, and found some folks who are actually running ThermoQuads, so I'm hoping that by way of a "welcome to the club" one of those folks might have a tip or two for me.

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Welcome to the TQ club!


If you give the metering rod tree screw a 1/2 turn clockwise, does your idle improve?