wont idle properly
 

Hi
i have a gc8 which i cant get to idle properly no more have replaced the air flow sensor an knock sensor as this what computer said. car runs better now but when it comes to idle it seat at normal revs than dies n either stalls or runs badly and have to keep reving it, than when take of it breaks down but once driving all is good car runs good.
also has a pod filter n front mount no other mods, car was running good for a year since had it now i dont know .
any ideas to help out as there are many modified gc8 out there

Atmo bov?

[QUOTE=barryke5;683814]Hi
i have a gc8 which i cant get to idle properly no more have replaced the air flow sensor an knock sensor as this what computer said. car runs better now but when it comes to idle it seat at normal revs than dies n either stalls or runs badly and have to keep reving it, than when take of it breaks down but once driving all is good car runs good.
also has a pod filter n front mount no other mods, car was running good for a year since had it now i dont know .
any ideas to help out as there are many modified gc8 out there[/QUOTE]

You have a GC8 which isn't idling correctly. You replaced the air flow and knock sensors as that was the error codes suggested was wrong.

However, (after said part replacement?) when the car returns to idle it stalls/dies and you need to throttle to avoid stalling. The Engine seems to "break down" on accelerating but once at cruising speed runs appropriately. You have had the car a year(?) [Ed-Ummm] and it's been running good.

Mods are pod filter and front mount.

Any ideas from the many owners of modified GC8s what the issue may be?

spark plug/s need replacing?

Hmmm,
Blocked fuel filter(s) or bad fuel?

If not then electrical like

Dying coil packs?
Dying plug leads?

Good luck.

J

I'm assuming you have plugs in good condition too

Check vacuum lines. Near alternator? These get hot/crack.

thanks for all that
year is 1999

yes new platium plugs installed,vaccum lines replaced,new fuel filter(using ultimate fuel).
got me stuck thinking changing the ecu to one i can modified maybe this may help but strange when befor all good
cheers

Plug the computer back in and check if the neutral position switch is working, you may also need to perform an idle relearn(not sure if gc8's can perform the relearn)

can you take a pic of engine bay?