Help please...R33 missing >3500rpm and at idle

[red900ss]

Hi all,

Series 1 R33 GTS25-t, stock

Engine starts to miss badly at around 3500rpm, sometimes ~4000, sometimes 4500. Tacho flicks around, no backfiring or popping. It does it under load, no load and also when you knock it back a gear on deceleration. Always around the same rpm. Will not go anywhere near redline.

Stock boost guage is indicating 350mm, bit hard to get higher than that as it won't rev high enough to get "2nd stage".

Idle is also rough, with a bit of surging.

It was suggested I changed the coil packs and have just done this with no change to the problem. I also chenged the plugs when the problem first arose.

:confused:

It seems to me like it's electrical but ??????????

Any help much appreciated......

[Zahos]

I had the EXACT same thing a few weeks ago. Even though it didnt show up on the computer at nissan, it was a coil pack. I couldn't even get it to go past 4000 rpm!!!

One of them was mysteriously missing the small spring in between the coil and the spark plug (Mystery b/c I always do my sparkies, and I always make sure the spring is there...), and the coil turned green.

Take your coils out, check you have all the springs that sit in them and give them a clean if your see any green bits.

Then Araldite the bastards as described in this thread.

That should fix your idle and 3000 - 4000 rpm hissitation!

If you still get a miss around 5500 rpm though (not like the one you had at 3500), then it is time for new coils.

Luckily for me the araldite fixed the problem, and the car pulls hard all the way through to redline.

[Nightman]

Mate, Look at this thread http://www.skylinesaustralia.com/forums/sh...ghlight=Missing it should answer all... don't go replacing coils and stuff yet, you would be amazed what Silicon can do when pushed between the gaps of the coil body and the metal going round the coil. U Gotta squish it through with ya thumbs! I have replaced the tape with this method and have not had a miss for a very long time... I also run the stock 1.1mm GAP now too!!!!

[Andrew85cm]

Yeah my RB20 was doing that probably because it had sat for over a year. I replaced the spark plugs cause they turned out to be factory and it started firing on all but one piston and then I figured out that a fuel injector was clogged so I tapped on it with a screw driver and hammer for a few minutes trying to break the injector loose and then it fired on all cylinders. I still need to run some sea foam. I also replaced the coil packs on the two cylinders not firing and I replaced my ignitor chip. I think neither of those items were bad. So just check it out and rule out all the cheap options. My situation probably doesn't apply but my point is rule stuff out with cheaper options before going all hardcore about it. I have a RB20det in my s13 and I am in the US so your motor probably hadn't been sitting for years lol.

~ANDREW~

[Sheriff Wan]

Have you checked your clutch??

Just a thought as a mate of mine had the same thing.

Hope that helps.

[red900ss]

Thanks guys, I had it on good advice to replace the coil packs so what can you do?

I'll check the springs, I have to admit I didn't bother as they were brand spanking new.

Excellent info in that thread Nightman, thanks!

It may be an injector, but it's smooth as a babies bum between idle and 3500rpm?????

Nope, it's not the clutch Sherrif.

[red900ss]

Problem solved!

Ali from Powerplay picked it.

Turns out it was the crank angle sensor. Swapped it and voila! revs like a sewing machine again! :uh-huh:

Idle is smoooooooth too.

Thanks to Joviant and Envy for the help too.