Engine Feels Rough Between 2500-4000rpm

[micksrb25]

Iv had my Skyline for a few months now and since owning have noticed the engine feels rough between 2500-4000rpm. It sort of feels like it is out of balance or something. Just wandering if this is normal for the RB25 or do i have problems. Car runs perfect besides this and its just got me a bit worried. Cheers

[zebra]

when was the last time it was serviced?

give everything the once over and check that the balancer bolt is done up tight

[micksrb25]

I changed the oil and filter 2 weeks ago. I will check the balancer bolt cheers

[Donnan]

Being the paranoid type, i got a 100k service done on mine not long after i got it.

Go to somewhere with at good rep like Trojan, ESP or Autotech that actually work on skylines; not just some guy who thinks that all cars are the same.

They will be able to sort out your problems and will actually know what they are talking about.

Just my 2.2c (inc GST)

[micksrb25]

Well all bolts are tight. Donnan i would take the car somewhere like that to get checked but i really dont have the cash at the moment. The car has 92,000kms on it so will have to take it somewhere in the next year to get the 100,000 service anyway. Hopefully its nothing major and will last till then.

[Bullet32]

Sounds like it could be a faulty CAS (Crank Angle Sensor)... I had the same problem with my RB25

To check if it is the CAS get someone with an identical RB motor to lend you their sensor, plug it in and if it fixes the miss-fire or rough revs then order one from Just Jap or another Japanese wrecker (dont get one from Nissan unless you want to pay through the @ss for it).

Start by checking the CAS, then if thats not it, move on to coil packs or ignitor.

(By the way - the CAS is the big round metal thing held in by 3 bolts on the front of the motor.)

Let us know how you go.

[micksrb25]

Hmmm ok any volunteers want to lend me there CAS so i can check to see if this is the problem. Or is there a way to test it with a multimeter or something, also if it was the CAS would it come up as a fault code because the ECU says no fault recorded?

[Bullet32]

Is there no-one kind enough to lend a fellow Skyliner a hand when they're in a tight spot??

I'm happy to lend you mine, but it comes with a catch... If it breaks while it's on your engine, you buy me a new one.

OK?

[Bullet32]

Is there no-one kind enough to lend a fellow Skyliner a hand when they're in a tight spot??

I'm happy to lend you mine, but it comes with a catch... If it breaks while it's on your engine, you buy me a new one.

OK?

After speaking with a professional about this, I'm afraid I have to withdraw my offer... There are too many variables with your problem

Speak to Angelo at Trojan Motorsport about getting a working second hand CAS (they have a lot of spares on the shelf) = 6242 6277

Tell them that Mick from Federal sent you

[Sir Lord Van Von Vader'ham]

not the offer! NOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[micksrb25]

After speaking with a professional about this, I'm afraid I have to withdraw my offer... There are too many variables with your problem

Speak to Angelo at Trojan Motorsport about getting a working second hand CAS (they have a lot of spares on the shelf) = 6242 6277

Tell them that Mick from Federal sent you

Hey mate thanks for your help and advise I will try and bring the car past there in the next 2 weeks, but with work at the moment its hard to bring it there during the day. The more i try to work out what it is myself the more i think it might not be the engine, its almost like the flywheel is out of balance or something