Desperately Need Answers

[cooldude1000]

hello, i have a problem with my s1 r33 skyline. It has a pod filter, front mount intercooler and 3 inch cat back exhaust apart from that i think everything else is stock.

when i start driving in the mornings or when the engine is cold everything is fine, makes good power all the way to 7000 rpm but by the time the engine has got to normal operating temp it feels like its misfiring from 3000 to 5000, then is ok to 7000rpm. Even driving normally under light throttle it will feel like its misfiring as soon as the revs get close to 3000. It has new plugs gapped to 0.8 and brand new coils (superspark) and the injectors have been cleaned and tested.

would really appreciate any help or advice

[bubba]

OK first off, I'm going to ask wtf you're revving it to 7k when it's not up to temp?!

Then, I'm going to suggest igniter or coil harness, check with known good items. My temp. related misfire issues were due to the plastic inside the coil plugs deteriorating and falling apart.

[RBJETT]

i agree with the whole checking the coils thing. also check the output from the sensors. ie MAF and water temp

[bubba]

The fact that he can push through the misfire leans me away from being sensor related but no harm in checking.

[paulr33]

when did the problem start? whats changed recently

what have you tried and checked? what boost (if non std)

[cooldude1000]

thanks for the tips. i pulled the coil harness out and one of the plugs fell apart in my hand so i need to repair or replace that item. any ideas where to buy the connectors or a complete harness???

[paulr33]

rhdjapan.com has complete harness

[Dale FZ1]

hello, i have a problem with my s1 r33 skyline. It has a pod filter, front mount intercooler and 3 inch cat back exhaust apart from that i think everything else is stock.

its misfiring from 3000 to 5000, then is ok to 7000rpm.

So it is running the stock ECU?

With those same mods I struck the failsafe "rich and retard" that the stock ECU is programmed to run. Same symptoms were observed.

[bubba]

thanks for the tips. i pulled the coil harness out and one of the plugs fell apart in my hand so i need to repair or replace that item. any ideas where to buy the connectors or a complete harness???

That's exactly what happened to mine. I had an electronics mate I used to work with at the automotive R&D place try to track me down the plugs but to no avail

rhdjapan.com has complete harness

That's where I got mine from except I could only get an RB26 one at the time.

Justjap has them aswell, for all models it seems.

[cooldude1000]

i found some connectors and repaired the wiring harness (n16 pulsar with the 1.8 litre motor has the exact same connerctors) but still no change. it has a stock ecu and is running stock boost so i am starting to lean towards a management issue. whats a cheapish way around the problem as i am planning on selling the car and don't want to spend mega bucks on something that im not going to use but i still want it to be fixed properly