Weird Noise When My Car Revs To 5000 Rpm

[joeyjoejoejuniorshabadoo]

my guess is coils too... have a search around here for 4.5k missfire and there is loads of info

[RBTWENY5]

yer i reckon ill change coils has anyone had experiance or know if those yellowjacket coils are any good?

and i rekon ill change plugs aswell what plug should i go for and what gap?

[RBTWENY5]

anyone?

[jutstar]

Dude,

Don't waste money on a dyno when its probably spark plugs ! When were they changed last ?

You want heat range 5 plugs, gapping them at 0.8 mm overcomes some missing problems

If its not Spark plugs I would go Coils, havn't tried the yellowjacket ones.

http://www.skylinesaustralia.com/forums/Mi...500-t32356.html

[mad082]

yes it sounds like either spark plug or coil pack issue. start with new plugs. if that doesn't help tape up the coils (there is a thread on here about how to do it). if that still doesn't work then it will more than likely be time for new coils.

i wouldn't go heat range 5 plugs. they are too hot and will just cause pinging due to higher cylinder temps. either BCPR6ES or BKR6ES are the 2 options. both will cost about the same and do the same job. ran both types in my 33

[robots]

I have seen it a couple of times on rb25det engines already. Like you gun it in 2nd gear, 4k, 5k, 6k and it like splutters. You think it should do the usual rev-limiter bounce, but it doesn't. It goes like brrr, like engine is running out of breath with very strange sound. Doesn't sound like the coil-pack misfire.

Anyone had this before ? When you rev it in neutral, nothing strange happens it just rev cuts at late 6k. Any ideas what could it be ?

[battery]

change the plugs and clean the coil pack contacts then tape them up and see how you go!

[blue 32]

i bought yellow jackets and they work fine. ive had them for 6 months now and no problems