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View Full Version : missfiring when not under boost...


Frankyy
05-26-2010, 05:32 PM
Heres my question:

when not under boost I have a missfire and gotta keep my foot on the pedal or else it will idle from 100-600. when I hit boost I have full power.

Things I have done so far:
change sparkplugs
tried good coils
n nothing,

Before that I degreased my engine bay I covered
intake and alternator, I was having little backfires, but now it's alot worst... my cap rotor thing looks good I had a drip of oil on the inside from my previous oil leak from the dipstick

S14DB
05-26-2010, 06:04 PM
Have you checked for boost/vacuum leaks?

Frankyy
05-26-2010, 06:23 PM
Ya everything is holding on everything is sealed... No leaks..

JDMRIDDAZ
05-26-2010, 09:22 PM
is it an s13?
then check the wire for the iacv...if it gets wet or crappy voltage u get crappy idle
that of course after u r sure everything is else is good...
my car was down a week cause this wire craped out on me

Frankyy
05-26-2010, 09:43 PM
is it an s13?
then check the wire for the iacv...if it gets wet or crappy voltage u get crappy idle
that of course after u r sure everything is else is good...
my car was down a week cause this wire craped out on me

yes it's an s13 so this might be it, the wire coulda got wet for sure, althought I know my car and engine pretty well I am not too sure where the IACV wire is located,

If I could locate it I could find out exactly if the wire is crappy.

does the faulty IACV wire cause missfire at like 2000-3500 RPM as well?

JDMRIDDAZ
05-26-2010, 09:53 PM
its in the f9 and f10 connectors (two plugs by the battery tray)....
its blk/yellow stripe...
if ur car dont idle it may have no power at all...my sr didnt idle at all till i track this down..
and u can cross this with frsport.com swap info
as far as misfire i dunno..that sounds like a pinhole boost leak or maybe a coilpak is slightly off from resistance...

Frankyy
05-27-2010, 08:11 AM
Thanks I'll check that out right away

steve shadows
05-27-2010, 09:36 AM
Heres my question:

when not under boost I have a missfire and gotta keep my foot on the pedal or else it will idle from 100-600. when I hit boost I have full power.

Things I have done so far:
change sparkplugs
tried good coils
n nothing,

Before that I degreased my engine bay I covered
intake and alternator, I was having little backfires, but now it's alot worst... my cap rotor thing looks good I had a drip of oil on the inside from my previous oil leak from the dipstick

Sounds like you're too lean.

Probably vacuum leak or crappy tune

Frankyy
05-27-2010, 09:43 AM
Problem fixed, that clip was loose when I did
a wire tuck 2 weeks ago. And I had a cracked vacuum line, replaced all the lines and it fixed the problem

thanks alot everybody for your help really really appreciate it!!