[Q-Jet] '75 Aneroid/APT question...
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 922
Likes: 0
From: Maine
[Q-Jet] '75 Aneroid/APT question...
My car feels like it's not getting enough gas when accelerating hard at part throttle. It'll run well for about 3 seconds then gasp, almost stall, then slowly recover. Fuel pump pressure is ~6 psig and volume is good. New filter, carb has been rebuilt and float level double-checked. I've rejetted for headers and true duals per Lars' recommendations and I can't see anything else wrong. Ignition timing is OK, new plugs, wires, etc. etc. I'm pretty sure the problem is in the carb.
This is the year they switched to an altitude sensitive aneroid mechanism that also looks like it controls fuel flow to the power valve. It looks to me that if you screw the adjustment screw "out" that it'll lift a needle valve and allow more fuel flow. Does anyone have any experience with this? :confused: I'd like to keep the stock carb & air filter assembly but a carb change is starting to look more attractive...
TIA
This is the year they switched to an altitude sensitive aneroid mechanism that also looks like it controls fuel flow to the power valve. It looks to me that if you screw the adjustment screw "out" that it'll lift a needle valve and allow more fuel flow. Does anyone have any experience with this? :confused: I'd like to keep the stock carb & air filter assembly but a carb change is starting to look more attractive...
TIA
Crackin' on...
Joined: Jun 2003
Posts: 9,430
Likes: 124
From: Somewhere in Tucson AZ
St. Jude Donor '09
Re: [Q-Jet] '75 Aneroid/APT question... (Frank75)
Two words:
Contact Lars!!! He is by far the supreme carb guru and will be able to help you out!
:bow: Lars!
Contact Lars!!! He is by far the supreme carb guru and will be able to help you out!
:bow: Lars!
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 922
Likes: 0
From: Maine
Re: [Q-Jet] '75 Aneroid/APT question... (73sbvert)
bump
I'm still hoping to hear form lars - changed the module and coil just in case they were contributing to the problem but no joy. Might as well change the fuel pump as well as I think it's original. Still seems to work well at idle but maybe something else is going on at higher revs.
I'm still open to ideas on what might be causing this problem.
thanks
I'm still hoping to hear form lars - changed the module and coil just in case they were contributing to the problem but no joy. Might as well change the fuel pump as well as I think it's original. Still seems to work well at idle but maybe something else is going on at higher revs.
I'm still open to ideas on what might be causing this problem.
thanks
