grip-addict
Active member
OZ's do look great!
map does air fuel mixture in gen 3. it's only for boost cut in gen2.
It also sounds ignition related to me. Assuming the spark plug gap isn't all wonky (please check this first), you've already tried all of the normal stuff which unfortunately leaves the less-fun options.
Can you verify the coil is getting 12v? It should get a constant feed.
Do you have access to an oscilloscope? I think you might need to start with checking what the wave length looks like @ 4k from the distributor triggering signals. NE is crank, G1 and G2 are cam sensors. G- is ground. It's an AC signal so you won't get very far with just a multimeter unfortunately.
Also, did you add any grounds right around when this started happening, or does your car have any extra grounds ? Sometimes adding and changing grounds can have unintended side effects.
This is a good read that might be relevant: https://www.hpacademy.com/technical-art ... -grounded/
Hopefully one of the old-timer forum members/electrical engineers from alltrac years gone by has a better idea because my first thought is to see what the VR sensors in the distributor are doing, and that'll probably take some time to work through.
best of luck
map does air fuel mixture in gen 3. it's only for boost cut in gen2.
It also sounds ignition related to me. Assuming the spark plug gap isn't all wonky (please check this first), you've already tried all of the normal stuff which unfortunately leaves the less-fun options.
Can you verify the coil is getting 12v? It should get a constant feed.
Do you have access to an oscilloscope? I think you might need to start with checking what the wave length looks like @ 4k from the distributor triggering signals. NE is crank, G1 and G2 are cam sensors. G- is ground. It's an AC signal so you won't get very far with just a multimeter unfortunately.
Also, did you add any grounds right around when this started happening, or does your car have any extra grounds ? Sometimes adding and changing grounds can have unintended side effects.
This is a good read that might be relevant: https://www.hpacademy.com/technical-art ... -grounded/
Hopefully one of the old-timer forum members/electrical engineers from alltrac years gone by has a better idea because my first thought is to see what the VR sensors in the distributor are doing, and that'll probably take some time to work through.
best of luck