Engine is skipping need help

slo1 · Sep 18, 2010

I have a 95 gt it has ported gt40x heads 1.72 roller rockers b303 cam cobra upper and lower intake and 65mm throttle body and is skipping at low rpms I have changed coil, plugs, wires, cap, rotor button, injectors, distributer, tfi or whatever its called on the pass fender well, injector wiring harness, maf, iac and tps. Im stumped it started before I swapped the heads it only skipped when it was cold and stopped know it does it all the time at low rpms when I get on it it smoothes out it has new push rods and lifters aswell and not making any noises at all just skipping. Any help would be greatly appreciated. Thanks Craig

LAFENATU · Sep 19, 2010

slo1 said:
I have a 95 gt it has ported gt40x heads 1.72 roller rockers b303 cam cobra upper and lower intake and 65mm throttle body and is skipping at low rpms I have changed coil, plugs, wires, cap, rotor button, injectors, distributer, tfi or whatever its called on the pass fender well, injector wiring harness, maf, iac and tps. Im stumped it started before I swapped the heads it only skipped when it was cold and stopped know it does it all the time at low rpms when I get on it it smoothes out it has new push rods and lifters aswell and not making any noises at all just skipping. Any help would be greatly appreciated. Thanks Craig

What injectors are you using?

slo1 · Sep 19, 2010

I ran a compression test today number 7 was dead ran it again with no rockers and it pumped up so i ran it one rocker at a time and found the lifter on the exhaust valve was stuck

CC'S95GT · Sep 20, 2010

good job
now start prepping for the dragon. ya got a month

NXcoupe · Sep 20, 2010

wow, just what I was thinking, only I thought a rocker might be too tight. Just replace all the lifters while you have it apart, not an expensive fix at all. Oh, and it's called a 'miss', little girls skip.

slo1 · Sep 20, 2010

Yeah yeah i figured someone would get me on that. Well i got my new lifters and a felpro 1262 intake gasket set today im soaking my lifters know ill put them in tomorrow and rechech comp on num 7. Then imma get her readyfor dragons tail i can't wait to meet new mustang people

NXcoupe · Sep 21, 2010

actually, the lifter manufacturers say to not soak lifters before installing them. Reason? Because the lifter will stick at full lift and could actually put a valve into a piston. It's best to let them pump up to adjustment and start out small, then work to full lift. Rather than the opposite. Good to know you got your skippin little engine on it's way to a recovery. lol.

slo1 · Sep 21, 2010

Yeah i've read that i've done it both ways i usually soak them for an hour or so they in the car know just sitting imma put the intake back on tonight and maby everything is good to go