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 Post subject: vn/vp commodore misfire above 5400rpm?
PostPosted: Mon Dec 26, 2011 12:38 pm 
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Joined: Sun Aug 24, 2008 2:00 pm
Posts: 1134
Car(s): TX SR20DET, TX G200W, Dato 1200 Ute
The back story... ive tuned a wingless sprint car running a vp commodore engine on methanol. Its a custom tune, with the injector and fuel system upgrades to suit. But... it misfires above about 5400rpm. The tune looks ok, and everything appears to be working ok, the rev limiter is set just a fraction below 6000 rpm. We've changed the plugs, leads, coils but the misfire remains. It must be something physical, but not sure what. Does anyone know of any common causes of similar ignition problems on vn/vp commodores that we should check?


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 Post subject: Re: vn/vp commodore misfire above 5400rpm?
PostPosted: Mon Dec 26, 2011 6:25 pm 

Joined: Tue Aug 26, 2008 2:22 pm
Posts: 290
Location: Murray Bridge
Car(s): Blown V6 Panelvan
Crank angle sensor maybe


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 Post subject: Re: vn/vp commodore misfire above 5400rpm?
PostPosted: Mon Dec 26, 2011 9:39 pm 
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Joined: Tue Sep 02, 2008 9:35 pm
Posts: 791
Car(s): IPRA G180 TX coupe, TURBO TX COUPE
Inlet manifold leak ?

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 Post subject: Re: vn/vp commodore misfire above 5400rpm?
PostPosted: Mon Dec 26, 2011 10:30 pm 
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Joined: Sat Jul 03, 2010 12:11 pm
Posts: 720
Car(s): TE Sedan, VT Commodore Wagon, VT Calais.
check the purge hose underneath the throttle body hasn't come off, causing a vaccum leak.

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 Post subject: Re: vn/vp commodore misfire above 5400rpm?
PostPosted: Tue Dec 27, 2011 10:43 am 

Joined: Mon Aug 25, 2008 9:27 pm
Posts: 569
Car(s): gemini panelvan x1, gemini coupe x4,tx sedan x1,
loose earth ? coil pack not completely tight ?wires i mean


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