R33 Rb25det Hesitation Problems

[leavz]

Hey guys


First time posting hopefully i'm posting in the right section seems like it's the best spot for it.

Anyway, i bought a r33 gts-t, it had some problems that i thought i could fix, the problems are

1. Car seems to hesitate (feels like it's hitting redline) from 2.5k rpm and higher also when it's boosting and spooling up, also feels like its jerking when cruising

2. when i take it for a drive and come back (car is warm) i stop, give the car a little acceleration then stop, the car starts too
idle funny drop rpm real low then rise to 1.5k and repeat itself, sometimes stalling.

they're the problems so far, I've replaced the coils with brand new yellow jackets which are installed, also i have a reconditioned MAF and a new TPS (both not installed)

I read alot of threads on people with the same problems and it boiled down to the coils so i replaced them which did nothing at all,
also i cleaned the AAC vavle was abit dirty but that didnt make any differance either, i guess the next step i'm going to take while i wait for replys is to install the MAF and TPS hopefully that fixes the idle issue.

Any help/comments appreciated cheers guys.

[KiwiRS4T]

I take it you replaced the plugs at the same time and gapped them down to 0,8mm?

What boost are you seeing?

You mention the MAF and TPS but could be CAS

Could be a lot of other things of course!

[leavz]

I take it you replaced the plugs at the same time and gapped them down to 0,8mm?

What boost are you seeing?

You mention the MAF and TPS but could be CAS

Could be a lot of other things of course!

No, i didnt replaced plugs, seeing 5 PSI boost steady.

i just fitted the recond MAF and the new Tps and it runs fine now cheers guys.

Just to clarify for anyone else who may be having the same problems and stumbles across this thread.

Replaced the coil packs with new yellow jackets

Replaced TPS (throttle position sensor)

Replaced MAF with a recond one off ebay

[R31 POWER]

I would do the cheap and easy things first. Like new BCPR6es spark plugs, fuel filter and check all intercooler joiners/ vac lines.

[Ben C34]

Why did you think you could fix it? Have you ever fixed similar stuff before?

Anyway, does it have an atmo blow off valve?

[leavz]

Why did you think you could fix it? Have you ever fixed similar stuff before?

Anyway, does it have an atmo blow off valve?

Havent really fixed stuff before mechanicly but doing alot of reading and finding out the common problems with the motor all pointed to what i replaced, plus wanted to learn abit more about cars engine wise, and it worked fixed it and now its running fine, no have a stock bov atm going to replace it since its probably worn from being so old

[GTSBoy]

Won't be "worn" from being so old. Might leak a bit if you get around to modding the car enough to run a lot of boost, but won't do anything bad to you at the boost you can run on standard ECU + turbo.

Do not replace with just any old BOV either. Reading/research required there too.

[leavz]

Won't be "worn" from being so old. Might leak a bit if you get around to modding the car enough to run a lot of boost, but won't do anything bad to you at the boost you can run on standard ECU + turbo.

Do not replace with just any old BOV either. Reading/research required there too.

Yeah i was thinking of putting on the hks sequential bov that cane with the car

[GTSBoy]

Yeah, nah. Don't do that. Sell it to someone who doesn't have an AFM car.

[leavz]

Yeah, nah. Don't do that. Sell it to someone who doesn't have an AFM car.

not sure what you mean by that lol

Anyway some news on the car, did a compression cylinder #1 100 psi, put oil down it tested again 125 psi, rings are gone.

all the other cylinders are 175 psi, shit happens i guess.

[GTSBoy]

Venting BOVs on cars with AFM load signal are a pretty bad idea.