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Thread: misfire/stumble/ high idle

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Posts: 1-10 of 16
2010-04-06 01:57:07
misfire/stumble/ high idle
95 200sx ser
car was misfiring under partial throttle but if i slowly pushed the gas down it was fine, i can cruise on the highway and hear a slight misfire

changed: plugs, wires, cap, rotor, tps

now car is idling at 2500rpms, i turned the iacv screw all the way shut and the car still idles at 1500, so im thinking i have an intake gasket, or TB gasket leak

just making sure this makes sense to everyone else before i pull the intake off
2010-04-06 02:49:05
with the high idle have you checked the vaccuum lines
2010-04-06 03:36:37
Originally Posted by GT2871RBLUBIRD
with the high idle have you checked the vaccuum lines

well there are only like 3 i think (i dont have emissions) and they are all new

fpr/iacv/ and pcv

i figure i must had had a nitrsous backfire or somthin and the intake gasket just now went?
2010-04-06 05:18:25
could have something to do with iacv.
2010-04-06 06:10:22
Originally Posted by LikeTheMovies
could have something to do with iacv.

with the iacv closed off the car still idles at 1700

a buddy of mine told me his car was doing the exact same thing mine was doing and a fuel pump fixed it, doesnt really make sense to me
but i can change out the pump cheap and easy to see what it does
2010-04-06 13:45:29
Read this thread, i also have had the same problems and plan on redoing all the lines
2010-04-06 20:05:48
changed the fuel pump and iacv, the high idle is gone but still has the stumble under load at anything more than 1/4 throttle
2010-04-06 20:24:03
No codes I assume?
2010-04-06 20:34:21
no there are no codes except for the ones about having the auto ecu

but, i think i've fixed it i changed my spark plugs again just to make sure
and car has zero misfire, im still confused but it runs so idc
2010-04-06 20:36:53
pressure test your intake, check for any leaks. Car stumbling under spray or NA? what're your plugs gapped at?
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