Bucking bronco!

[david_viny]

Well to get to the point, my car bucks pretty hard with very light throttle on a level road. Basically from 1200-1600rpm and 50kpa and lower. If I put any load on the engine it instantly clears up and runs fine. I thought it was fueling as in too much fuel so I have been taking 2% out of the VE in the bucking area at a time and it was helping but now got to a point its bucking harder. There never was a point where it was gone. Timing seems reasonable at around 32°. What do?

Cam has 10° overlap @.050" lift.

Also it is in speed density right now while messing with tune.

[Ben Charles]

Pull out a bunch of spark, problem solved.

[david_viny]

Pull out a bunch of spark, problem solved.

Thanks, that worked!

Ended up at 22° in that area and bucking is ALMOST gone. Whats average timing for these areas with mid size cam?

[Ben Charles]

Depends on the cam really, Ive done large 24/25x cams with no buck at low rpms. When there that big you have to mess with fueling as well.