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#1
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Thermoquad running rough on secondaries
I had a problem with my thermoquad late last year and actually it was a week fuel pump that was my headache. I changed the pump and put a new filter and everything was back to normal till last Friday. The car starts up fine and idles good and as long as I am in the primary bores everything is good. I can drive around town with no hesitation and is as smooth as glass idling. As soon as I open up the secondaries she jumps to life as it should and when I let off on the gas it bucks and hesitates and runs horrible. It will continue like this for a long time and will not smooth out as before until I stop and turn the car off. I let it sit for 20 seconds and then after cranking for what seems like forever, it starts again and idles smoothly. Here is my thinking. When I open up the secondaries either the secondaries are being held open after the run and adding to much air to the carb, or somehow fuel is continuing to be dumped down the secondaries when there shouldnt be. Or could it be a combination of the two. Just as I type this I was thinking next time I open it up I should pull over to the side of the road and pop the air cleaner to see it the secondaries are still part of the way open. Any thoughts
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#2
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Difficult to tell over the net. If, after the long cranking period, the exhaust gives a puff of black smoke when it starts it was flooded. I suppose the sec's could be sticking and when you let up on the throttle the air valve closes and acts like a choke. This is strictly a SWAG*! Like you mentioned, jump out with flashlight in hand and eyeball the situation.
*Scientific wild a$$ed guess |
#3
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Bigfoot, sorry to hear about your ThermoQuad problem. I feel guilty, I think I just got my problem cured. (See my latest update on float level question).
I don't have any experience with your problem, except, it sure does seem like some linkage is sticking. Keep us updated. |
#4
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yup
Try new floats and needles and seats. Be very careful blowing out all the passages with compressed air. Don't forget to reinstall the sec flow diverter.
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#5
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What is the secondary flow diverter ?
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#6
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oh
It's that thin flat plate that hangs vertically in the sec venturi area of the bowl, just below the bowl cover. If you forget to reinstall it, the airflow thru the sec.'s gets real confused!
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#7
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I made sure the diverter was there, it only can go in one way. I did a run on the way home and when I popped the air cleaner the secondaries were closed all the way, so it must be extra fuel somehow. I will need to read up on how the secondaries actually work and try and figure it out.
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#8
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The only way for fuel to be pulled out of the secondaries is for the butterflys to be open below it. Vacuum is what pulls the fuel out.
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#9
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Duh! I never thought of that. I will make another run tomarrow and when I pop the air cleaner I will try and see if the mechanical link to the secondaries is binding on something and keeping them open a slight bit.
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#10
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more
If you pull the top off and find any crap in the bottom of the bowl, I am thinking all the fuel passages and air bleeds have crap in them, too. See, earlier post.
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