Carb swap guys, help!
Thread Starter
Staging Lane
Joined: Sep 2011
Posts: 51
Likes: 0
Carb swap guys, help! I've got a 94 mustang with a lq4, victor junior, holley 750, 234/238, patriot springs, and 1 7/8 dynatechs. Using the 6010 box. Ive tried the pills, and my own curve and the problem hasnt changed. It starts up just fine, but then stumbles and backfires through the carb and exhaust. I through a timing light lead over the plug wire to show when it was sparking, and a few of the cylinders seem to cut out completely when i hit the gas. I called msd and they dont know what it would be. I have changed cam and crank sensors, checked rockers, pushrods, timing gear alignment. Also made sure we had a good ground and constant 12v. Anybody have this problem or have any input, Im lost...
Coils? Is the Carb new or used. My cam is a 236/240 so it close to yours, My timing curve starts @ idle @ 25* 800rpms, by 2000rpms is 27*, then by 5100rpms it goes to 31* and stays there until my 6800rpm.
Also may check the plug connections that connect ur MSD box to your coil wiring...I have heard that sometimes the connector pins are not pressed in all the way so it doesnt make a good connection
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Thread Starter
Staging Lane
Joined: Sep 2011
Posts: 51
Likes: 0
It's an iron block 6.0 with 317 heads, as far as I know, that setup was 24 tooth. I'm near Dallas, you close? The sideband shows slightly lean, but I think that's normal when not under a load. It does idle really high thought too, and the idle screw is back all the way off
Thread Starter
Staging Lane
Joined: Sep 2011
Posts: 51
Likes: 0
Also I notice when I have the dial pulled up on the pro-data software, it shows 1.1 psi on the map gauge, but I don't have the map sensor hooked up. The map curve is flat lined at zero, is that normal?
If I remember correctly my MAP is at 0 also
I'd check the plug connections within the plug, plus u should have to have ur idle screw turned all the way up to keep the car running, should idle around 800rpms, I could turn my timing down but I would have to increase my idle, and Im at 25*
I'd check the plug connections within the plug, plus u should have to have ur idle screw turned all the way up to keep the car running, should idle around 800rpms, I could turn my timing down but I would have to increase my idle, and Im at 25*