R33 Spitting/losing Powed

[cowdy]

so in second and third if you get it up to baout 4700 4800 rpm it starts to go from the ususal brrrrrr to bdrbdrbdbrbdbrbdbr kind of sounds al lose acceleration and just pretty much peak

what could be the cause. ask if more info is needed

its a 1994 r33 rb25det

[GTSBoy]

Oh. The most asked question on SAU rears its ugly head again.

[Ben C34]

but someone will answer it, and the cycle continues.....

[cowdy]

Oh. The most asked question on SAU rears its ugly head again.

Woah so common problem Im guessing?

I bet it's something silly like plugs on fuel filter

[colourclassic]

http://www.skylinesaustralia.com/forums/topic/322552-r33-s2-rb25det-stutteringhesitation-problem-at-specific-revs/

coilpacks.

http://www.skylinesaustralia.com/forums/topic/122908-rb25det-stutteringhesitating-problem/

plugs.

Edited June 16, 2013 by colourclassic

[cowdy]

Thanks for that

The packs are what look like brand new split fires. So ill do plugs filter and see it that's the go

[Bunta]

Dont forget the R&R threshold in the ECU

[cowdy]

The what and what?

[Bunta]

Once your airflow reaches a set level as measured by the Air Flow Meter it will richen your fuel map and retard the timing to protect the motor. This is assuming you have the stock ECU of course

And while the coil packs mat be new the loom probably isnt.

I would

1. Change plugs.

2. Clean the contacts in the coil packs between the pug and the coil pack AND coil pack and loom

3. Use the contact cleaner on your AFM element

If the problem persists turn your boost down until it stops, you are effectively reducing your airflow below the threshold doing this.

if it still persists think of ordering a new loom from nissan

[cowdy]

Thanks bunta your spot on old loom and stock ecu, I have no idea how to change the boost..... Give me a rundown?

[Bunta]

I assumed you may have an aftermarket boost controller, If you don't, don't worry about it.

[cowdy]

Car is pretty much stock. Not doing any performance mods till off p plates don't want any extra attention

[Bunta]

In that case don't worry about the R&R just focus on the other stuff.

[cowdy]

Thanks again

[discoPumpkin]

listen to Bunta, he's made over 4million psts on here, he'd know what he's talkin about by now lol

[cowdy]

Hahaha

Hax?

[GTSBoy]

Whatever it was the the pumpkin said (I can't see it because she's perma-ignored in my settings) you can probably ignore it.

[discoPumpkin]

Hahaha

Hax?

I think maybe, Bunta?

[cowdy]

Had a look at it today. Did fuel filter. Plugs. Stock packs. New loom. Same problem

Also found a leaky vaccume line to the map sensor and a leaky bov...

[Got a Pulsar]

What air filter? (dry or oil) and is it clean?

Have you cleaned the Airflow Meter?

What Boost level do you get?

What plugs and gap?

Any Errors in the ECU? / Reset ECU?