still missing

[306lx]

well my car is still missing above 4500 rpm's. i changed the TFI module on the dist. set the TPS, i am sure my fuel pump is fine because the car hold fuel pressure even when its missing. if it was bad i would think you'd see a flucuation on the guage. there are no vacuum leaks, the volts dont drop. i am kinda stuck. the car runs perfect until its brought up above 4500 rpms mostly under WOT. could weak valve springs be causing this? i have a set of gt-40p heads ready to go on but i want to figure out the problem first. any ideas? thanks guys

 

[HISSIN50]

Are you sure your coil is not weak?

Good luck.

 

[txstang84]

Are you sure your coil is not weak?

Good luck.

good thing to ck....also, are the plugs gapped right? what condition are your wires/cap/rotor in? are you kicking out any codes?

usually unless you broke a spring (you'd hear that-sounds like a really nasty exhaust leak), you shouldn't have valve float until the 5500+ range

 

[306lx]

i havent checked the coil, i will tomorrow, plugs are gapped good, wires, cap and rotor are all new. i was thinking the springs might be weak. it has an e-cam and i doubt they changed the springs. i am gonna check the springs this weekend. thanks for the suggestions!

 

[Funanin]

find someone with an MSD 6AL box and try hooking it up if you cant come up with anything else. If that doesnt work its probably a fuel problem.... filter/pump/dirty injectors/clogged regulator.