Help Needed Bnr32 Gtr

[Dynamix]

I was wondering if anyone knows how to fix my gtr. When i start it up its fine, leave it to warm up its fun, but say 15 mins into driving it it starts to splutter and hesitate whenever coming on boost, like it is dropping a cylinder, then it'll drop a cylinder alltogether and run on 5. After that happens it wont rev above 2000rpm without all the cylinders cutting in and out making the whole car shudder, i have no idea what it could be. I have cleaned the afm's, changed spark plugs, the next on the list is cleaning the electric connections to the coils and temp sensor with some cleaner. Can anyone shed some light onto what might be happening? The motor has a blitz induction kit, exhaust and clutch, its pretty much stock.

[pnblight]

Sounds a bit like the igniter unit might be faulty, got anyone with a rb26 you can swop parts with to find the fault?

[Guest Variable]

Dead coil pack.

Next time it happens, pull over and while the engine is still running unplug one coil pack at a time. When you find the one where the idle does not change, you're got the culprit.

In preparation for this, you might want to remove the coil pack cover (if you haven't already)

[benm]

Yeah i'd be suggesting the coil packs too. You could try taping them up (1 at a time) with black electrical tape to also try and find the culprit.

[Aztec]

I don't know much about these engines, but mine did a similar thing when I changed the plugs recently. Check the connection on the cdi at the back of your engine, mine was not on properly and ran like a dog. You could notice the difference when you wiggle the connection at the back.

Hope this helps!

[Robbo]

I had the exact same problem and it was a faulty PTU, which is the little box on the back of the coil covers. That said it could also be a coil pack though.

[Dynamix]

Thanks for the sugestions guys, i will check the connections and try cleaning the plugs with an electrical cleaner incase they're dirty. I had a feeling in might be that connection, i might go to my mechanic and get him to test how stong the spark is to each coil just incase. I've also noticed that generally the exhaust note and idle not of the car has charged, its sounds lumpier and crap even when just starting up the car..

Edited August 28, 2005 by Dynamix

[Silver-Arrowz]

Similar thing happened to my previous car. Ended up being AFM. Swap AFM with another GTR and go for a drive to find out.

[psybic]

I'm having same issue. EVERYONE loves to say coils. Not only that, they don't seem to take any other idea as an option, but coils would normally break down when cold, rather than hot.

You really do need to check coils as well as ignitor, but my money is on ignitor.... when my ignitor finally arrives in the mail, we'll see.

To check coils, check resistance with a multi meter. Pin on Left to Pin in center, should read as little resistance as possible. Around 0.7

From the Pin on the right, to the spring which attaches to top of plug, resistance should be infinite.

[ylwgtr2]

i have my money on igniter.....heres what you do to check......run it until it does it...then pull over and let it idle and pull each injector plug off untill you find the dead cylinder....then change the dead cylinders coil with a good cylinders one.....repeat the test again and if it happens again on the same cylinder...its the igniter.....the ecu can also cause this but i reckon the igniter is crook

[Dynamix]

Hrm cleaned and pulled apart all the coils and ignighter, its seems to be running and idling slightly smoother then drops a cyl again after it starts to heat up a fair bit. Also pu another set of brand new spark plugs in again. I can get my hands of a set of rb25 coils for free, will they work in the rb26? I'll keep trying those idea's, thanks for the feedback guys.

[Dynamix]

Dead coil, pulled the coils off one by one and checked them when it dropped a cyl, number 5 was dead and made no difference so i swapped it with number one and then number one died and made no difference when i started it back up. Does anyone know if rb25 coils will work on the rb26, and if so will it be safe?

[psybic]

You can use RB20 with RB26, but not RB25, I'm pretty sure anyway.

[Dynamix]

You can use RB20 with RB26, but not RB25, I'm pretty sure anyway.

<{POST_SNAPBACK}>

Thanks for that info, can anyone else confirm this at all?

[benm]

www.nengun.com will show you which model coils are required for what model engine.

[Gav]

Easiest way to diagnose is find a friend with another R32 (rb20 uses same coils, harness and igniter as RB26 BTW) and swap out with his known good bits one at a time.

If all is swapped (including the harness - I once had a problem with the grounding lug not having a good connection) and you still have probs, check the spark plugs for cracking on the insulation.

With persistence you'll find the problem.

Edited September 1, 2005 by Gav

[ylwgtr2]

you can buy them new from auto one in niddre melbourne

[Dynamix]

Easiest way to diagnose is find a friend with another R32 (rb20 uses same coils, harness and igniter as RB26 BTW) and swap out with his known good bits one at a time. 

If all is swapped (including the harness - I once had a problem with the grounding lug not having a good connection) and you still have probs, check the spark plugs for cracking on the insulation.

With persistence you'll find the problem.

<{POST_SNAPBACK}>

Thanks for that info, very helpful! I'm getting some rb20 coils this afternoon to put in to replace the one i know is dead, i also had a feeling that it may not be grounding/earthing as good as it should be aswell, so i might get an earthing kit, or make one up. The plugs are fine, no signs of cracking but the one on the dead coil is wet looking as it would be because its not sparking, other than that they are good, they're only 3 days old. If that doesn't fix the problem i can grab a whole set of coils, igniter and harness of a mate.

[blind_elk]

Dead coil, pulled the coils off one by one and checked them when it dropped a cyl, number 5 was dead and made no difference so i swapped it with number one and then number one died and made no difference when i started it back up. Does anyone know if rb25 coils will work on the rb26, and if so will it be safe?

<{POST_SNAPBACK}>

Coils from a S1 RB25 will work, because they use a seperate ignitor module. Coils from S2 RB25 don't work because they have inbuilt ignitors.

[Dynamix]

Hrm, the cylinder doesn't die now, but it still feels like its not a solid spark, like the spark is getting blown out, could it be an earthing problem?