missfire under hard throttle
hi all!!!!!! im new here but not to turbo cars but this has got me stumped i have a missfire under hard load more when on full boost in 3rd 4th 5th but once over 4000rpm its gos away and drives fine i have had new maf sensor knock sensor oxygen sensor all new boost hoses with 1.2mm bit in the boost line ecu reads no fault code :brickwall the car is a my99 uk model with wrx05 intercooler hks dump valve powerflow from cat back .... any help please would make me a happy man again:confused:
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Lots of new bits but no mention of a rather obvious thing to check - the plugs and coil pack?
JohnD |
I got a very similiar fault with mine mate although mine doesnt clear unless i back off.Just changed the leads thinking that would solve the problem,but no such luck.
Hope you get it sorted mate before it costs you anymore. |
im going to get at the plugs weekend. my99 so only one coil pack but had that checked. i think it could be plugs but before i got the car it had a full service with plugs less than 8000 mile ago cheers for your help i will post back and let you know how i got on. if it ever stops raining !!!!!!!!:wonder:
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Check the plug gaps. Should be 0.7mm.
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hi mate.....:thumb:
check the plug-leads are firmly pushed on the spark-plugs.. under heavy accelleration on my old my99 I popped off one of the leads. might be worth checking... Peppe..........:) |
i had a very similar problem with mine but mines an earlier model. I relpaced the coil packs and it was fine again. Might be worth checking
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i have the same problem was really bad but changed plugs and now it is very slight when it does miss. i have changed leads as well, my car is also a my 99
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after looking at my boost i think it may be over boosting does any one know what the fuel cut is on a my99 it hits 16psi then drops to 14 psi is this right :confused:
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Sounds a bit high. Standard boost on a UK 99my should be around 0.8 bar (12psi)
JohnD |
mine boosts to 16 psi as well but mine is a rb5 wr sport (ppp)
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