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Stoo
03-09-05, 02:53 AM
Right, My XEd nova has a problem!

At idle, it fluctuates like crazy! Drops down to, 2-300 Rpm then fires up to 1500-2000 rpm then down to 11-1200 rpm fluctuates there then goes mad again! Sometimes cuts out at idle, also sometimes at junctions/roundabouts when decellerating! Very annoying! Car also seems to be mis/backfiring either when setting off or high up the rev range in 4th 5th gear splutters and pops!!

im struggling to top 115mph as well! seems to be running rich at the lower end of the rev range and lean up top!! just doesnt seem to wanna go any faster!

its driving me insane please help!!

BTW its an early XE, running PiperX filter, homemade power cap! Just had new leads, dizzy, rotor arm and coil! New AFM also! Large rocker cover breather pipe (to TB) has been blanked at TB and vented to atmosphere from rocker cover to a small filter!

Hope this helps!!

dannyboy21
03-09-05, 07:00 AM
sounds like the idle control valve

DaveMarshall
03-09-05, 10:05 AM
I'd agree idle control valve or you may have an air leak, is the home made power cap well sealed?

DirtyDave
04-09-05, 01:43 AM
it defo sound like the idle control valve, i've come across this in astra's and cav's, but do check for any air leaks, as this could also give the rev's some fluctuations.

Dave

mad-driver
05-09-05, 06:59 AM
Also if you have induction kits on, especially in hot weather it doesnt help sometimes

Rob-16v
07-09-05, 08:12 PM
could be lambda sensor