miss firing r32 GTR

[7heavn]

My GTR is missing at about 4,500-5,000rpms pretty badly so bad infact that I lift off straight away when it happens . Pulled plugs out they were NGK BCPR6EY 11

(11 meaning 1.1m gap) . I thaught this was the problem so replaced with a new set of the same plug but gapped at 0.8m but still has the same missing problem.

I've also tried disconnecting a coil pack at a time while the car is running to see if the idle didn't change when one of them was disconnected but as each one was unplugged the idle dropped they seemed to be all ok.

The car is fitted with z32 air flow meters , do these have problems like the standered units would it be worth my while to take them out and clean them with contact cleaner ?.

Car is going to the mechanic next week but just interested to know what else could be causing my problem?. The car has a few bolt on mods including 2530's , PFC , z32 airflow meters like stated .

[r31 Koop]

It could be your ignitor box, They **** up, a loose wire going into your Power FC or maby your CAS but the last is unlikely, because of the way that you described the misfiring..

[Guest two.06l]

My GTR is missing at about 4,500-5,000rpms pretty badly so bad infact that I lift off straight away when it happens . Pulled plugs out they were NGK BCPR6EY 11

(11 meaning 1.1m gap) . I thaught this was the problem so replaced with a new set of the same plug but gapped at 0.8m but still has the same missing problem.

I've also tried disconnecting a coil pack at a time while the car is running to see if the idle didn't change when one of them was disconnected but as each one was unplugged the idle dropped they seemed to be all ok.

The car is fitted with z32 air flow meters , do these have problems like the standered units would it be worth my while to take them out and clean them with contact cleaner ?.

Car is going to the mechanic next week but just interested to know what else could be causing my problem?. The car has a few bolt on mods including 2530's , PFC , z32 airflow meters like stated .

question:hows your fuel supply???

[7heavn]

fuel supply seems to be ok it's a bosh intank pump with denso injectors and hks fuel rail. Another thing is the miss only happens under load , reving in netural it will rev clean.

[wrxhoon]

it could be the coil packs , they break down under load and more so when they are hot .

does it always do it ? only when its hot ?

other than that check to see if your injectors are maxing out , it could be them or fuel pump .

[7heavn]

it's not an issue of the fuel system maxing out as this problem has only occured recently . I'm also thinking either coil packs or cam angle sensor. I'll take the car for a run later to see if it does it when it's cold .

[cameron]

Try taping up your coil packs with electrical tape. around the rubber boot so the spark doesnt ark out.

[Ronin 09]

I have the same problem. Only happens when hot.

Does your car hard start when warm? Mine does, and the misfiring is only under load, getting worse when hot.

Because it hard starts when hot, only misfires under load (I have new plugs @ .8mm), I am going to try new coils - next weekend. Will let you know how I go.

[7heavn]

fixed my prob turns out was just a bad batch of fuel car pulls nice and clean now.