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So, i have this very low missfire/thump at around 1200 rpms, but if i play with the tps i can almost change the location of this missfire/thump, its very werid, and i believe it affects driving throughout the rpm range
Parts i have changed out.
Plugs
Wires
Cap+Rotor
Fuel Filter
TPS

anyone have any ideas/methods of testing things?

when the tps is disconnected it misses alot more

change teh O2

o2 seems to be in check, goes into loop at idle, and open when driving, i don't believe its the o2

anyone else got a clue? i did a boost leak down test, set timing..

what bov are you using?

have you tried...
1. setting your tps to its factory position?
2. changing your cap/rotor/wires/plugs?
3. a new coil?

meh....check compression, bad ringland will cause this....did it to me anyway...

tps is new, and is set to factory position, brand new spark plugs, and wires, cap and rotor have about 2k on them, waiting on a coil, the one that is in there did pass the test, compression is 180 across the boards, using a hks ssqv(has given me no problems)

also when driving and light throttle is applied/vac is between 20-10 it kinda bucks/thumps, but when i give it some more gas it seems to go away, but i believe myself that its the igintion, and i doubt its my ignitor since it doesn't follow in those symptoms, hopefully the coil will do it

I do pull off 21vac at idle, but when my car is around 2k on the dev rev it gets really low like 25-26 while it pops, lol

This post has been edited by supra12big: Jul 11, 2008 - 2:04 PM

anyone????