Jump to content
SAU Community

Rb25 Problem


Recommended Posts

Hey guys,

Just after some help with my current problem.

When I drive my car and go over 5000rpm the revs hold up. When its in gear it will hold the revs say at 4000rpm and when I engage the clutch it will redline. It does this for a few seconds then goes back to normal.

When this happened last I put my foot behind the pedal and it was all the way up.

I've checked if the throttle cable is jamming and I can't fault it when the car isn't moving.

Cleaned the AAC

Cleaned the throttle body

What else can I check? I'm lost at what it could be.

Mods are:

Greddy plenum

Hypertune throttle body

3037s

Injectors

Power fc

Z32

It had all this work even before the problem started. And sometimes it won't happen

Thanks for your help

Link to comment
Share on other sites

Possible TPS fault. If you can get a commander hooked up to the ECU, look for TPS voltage to drop to <0.5 V as you close the throttle.

Also you need to look for vacuum leaks and watch the ignition timing. If it is unusually high, that may cause a big rev too.

Link to comment
Share on other sites

Possible TPS fault. If you can get a commander hooked up to the ECU, look for TPS voltage to drop to <0.5 V as you close the throttle.

Also you need to look for vacuum leaks and watch the ignition timing. If it is unusually high, that may cause a big rev too.

Thanks mate, ill check the tps

I don't think it would be a vacuum leak because it doesn't happen all the time

Link to comment
Share on other sites

I changed the tps and the problem is still occurring.

I took the throttle body off and it still looks good. Sat there for a while opening and closing it and never jammed.

While I was out testing the problem again I would dab the throttle when it was keeping the revs up and it would stop.

I'm going to have a look at where the throttle cable joins the pedal and see how I go.

Wish me luck

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share



  • Similar Content

  • Latest Posts

    • Hey everyone,   Probably been covered 100 times but i couldn't see anything when searching  Time has come to replace / upgrade my turbo, dont have any crazy plans for the build maybe 350 - 400kw in the future  Engine is a basically stock R33 RB25DET apart from Apexi power FC, S15 injectors, Boost controller, Z32 AFM, Cold air intake, free flow exhaust  have been looking at the Pulsar GTX3076R 0.82 will this be a good option? wont be upgrading the injectors and coils till next year then pushing for 300kw so dont want anything to laggy in the mean time, car is track only not street   TIA 
    • A group of friends hired the local drag strip off season, cold weather and no prep means it was super slippery but still allowed for a fun day of 1/8th mile (no ambo meant we couldn't do side by side 1/4) roll racing and Dragy runs.   The wee BMW didn't embarrass itself at all considering the 2WD group I was competing in had a couple of supercharged V8s (an LSA and a blown LS2), a 600kw M135i, a 500kw R32 GTS-t and some other spicy things - I actually ended up beating the blown LS2 & 600kw M135i heads up in roll races and faced the GTS-t in the final, losing by just over a carlength which is far more than I was counting on with a very mildly tinkered with M135i.   For transparency sake this was EVERYTHING to do with being a fairly short distance on a shit track and having something without any lag and a brilliant gearbox, on a prepped track or a full 1/4 I'd have been destroyed. I did do a single sneaky full (well actually turns out I hit the brakes 10 or so metres early) 1/4 mile Dragy run and hit 12.88 @ 109mph on the brakes which is precariously close to my PB in my old GT30R GTS25t that ran 12.6 @ 111mph on Hoosiers  Pretty damn stoked with that considering I had a single attempt, and despite seeming well suited to the conditions vs the higher power cars and the time slip not looking THAT bad I still was having to work hard to not just do a rolling burnout <100kph and doesn't really show it's best at all.  I am pretty sure it would happily match the old R33 with a full run on a better surface
    • Thanks! Shame you got rid of yours. Guys are getting insane power out of them with the newer turbos these days instead of the venerable K04. Just jumped on Carsales and realised that my old Flog is considered low mileage due to it being parked up for close to a decade.
    • I love this. I still have a special place in my heart for Mk4's. 
×
×
  • Create New...