Miss Firing above 30 - 40% Throttle??

[NA_R33]

Hey all,

Just a quick question, my car started miss firing the other day above 30-40% throttle and generall high in the rev range, then it went away. Came back today just before i filled it up but alot worse like doing 100% of the time newhere above like 20% throttle. The plugs are only 5000k's old so im asuming its not them could it be bad fuel as it went away again about 10 mins after filling it up?? I just though bad fuel would only effect highly tuned cars, mine only has an safc and slightly advanced timing? Nehelp?

Cheers

John

[Tosh]

I had a very similar issue with my car (MR2 Turbo)

First of all after changing the alarm system the problem went away for approx 6 months. (the wiring on the old alarm was dodgy with a capital CRAP!) However the miss did return after that and ended up being the fact that the distributor and rotor button were worn out and hence the engine was not getting spark causing it to miss fire and sound like it was running on 3 cylinders.

For you car I would reccomend checking out the coils to make sure youre getting enough spark & check the plugs to make sure they're not fouled.

[R31Nismoid]

It could be fuel.

it's possible if it's rare.

what sort of plugs?

Platinum's or coppers? It's not unknown to foul te plugs in 5000 km's if the car's tune is bad or the fuel reg died in the ass.

[CWest]

hey NA had exactly the same problem as u a while back. Ended up being 1 coil pack, its quite a common problem. Just check them 1 by 1.

[NA_R33]

Cheers for the reply's guys, it seems alright with the new fuel, but i have a feeling thats not the problem ill check it out tomorrow at work.

[Sumo]

I melted my coppers in under 5000kms

Sumo

[predator]

o2 sensor or AFM related problem.. sounds like. When the ECU goes into "open loop" mode after certain revs and starts reading from the AFM and o2 sensor

[red17]

Definately sounds AFM to me.

My 02 sensor is dead as a doornail on my RB20, yet I have no problems with the car at all. Dunno if 33's are different in this manner.