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Author Misfire underload
HarleyMK
Member
Registered: 17th Apr 11
Location: Milton Keynes Drives: Corsa Sport
User status: Offline
   25th Aug 12 at 13:11   View User's Profile U2U Member Reply With Quote
Anyone got any ideas why my car is misfiring, I have checked or replaced:
Plugs (replaced)
Leads (replaced)
Coil pack (replaced) 
Cam sensor (replaced)
Map sensor (replaced)
Crank sensor
Vacuum pipe
Air leaks
Wiring looms
Fuel pipes
Fuel pump
Filter on pump (replaced)
Currently changing fuel filter

If I go past 1/4 throttle the car starts stuttering and continues to do so until I come back off the throttle slightly
Only does it under load?

This really has me stumped so any help would be great

Cheers
Harley
Gary
Premium Member

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Registered: 22nd Nov 06
Location: West Yorkshire
User status: Offline
25th Aug 12 at 14:42   View Garage View User's Profile U2U Member Reply With Quote
Cleaned injectors?
HarleyMK
Member
Registered: 17th Apr 11
Location: Milton Keynes Drives: Corsa Sport
User status: Offline
25th Aug 12 at 15:53   View User's Profile U2U Member Reply With Quote
The injectors, fuel pump and filters were all replaced about 4 months ago
*CorsaCal*
Member
Registered: 3rd Oct 10
Location: Leicestershire Drives: 20XE Corsa
User status: Offline
25th Aug 12 at 17:40   View User's Profile U2U Member Reply With Quote
Havn't you literally just fitted a power box so it could be related? What do you have to unplug to fit that? Check they are plugged correctly?
corsadonk
Premium Member

Registered: 4th Jul 09
Location: Marlborough, Wiltshire
User status: Offline
25th Aug 12 at 18:37   View Garage View User's Profile U2U Member Reply With Quote
Air leak.

 
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