Rb20det Missfire

[MR CRX]

Posting for a mate

he has a 93 GTS-T R32

Went for a cruise the other day and it decided to shit itself

it missfires whenever hard throttle is applied at anything from 4,000 onwards

checked sparkplugs, coil packs, fuel filter, and put in a fuel pressure regulator,

still has the same issue.......

has anyone had this problem before and do they know how to fix it ?

everything was working fine until the RSM Overrode the speed limiter

[r32_rookie]

Yeah thanks John... This really has me stumped if anyone has any ideas please let me know...

[r32_rookie]

Any ideas please i need to fix this for the drags...

[blind_elk]

When was the last time you had the injectors cleaned?

The ignitor modules (little black box at the rear of the valley cover) are prone to start misbehaving under heat stress. They often recover once everything cools off. Try swapping with a known good one.

Try cleaning the AFM, maybe swap for a known good one.

[r32skyline_89]

had simular problems when first brought my skyline. Used multimeters to check fuel pump. Needs to be running 12volts but can sometimes drop to 11 causing a surge which can seem like a missfire. If not that check AFM. Does it have trouble idoling sometimes ??????????????

[r32_rookie]

No it never has problems idoling... I am swaping AFM with a mates tomorrow i will let you know how i go.

[SECURITY]

could be your coils too.

[flagger]

have u checked the diagnostic mode on your ecu to see if any errors came up? i had a similar prob yonks ago, the ec u said MAF sensor error. turned out it was the plug to the AFM, just a bad contact in the plug itself. bit of contact cleaner and its all good

[r32_rookie]

Guys thanks for all the help on second inspection of my spark plugs it was plug number 1.

The tip had fully snapped off and these are platinum plugs only 14,000ks old.

[SECURITY]

try running a hotter plug