Jump to content
SAU Community

Car Reving From Stock Idle To 2000Rpm By Itself?

R34gymjunkie

By R34gymjunkie,
in General Maintenance

 Share

Recommended Posts

R34gymjunkie Contributor

R34gymjunkie

Posted
Posted

Installed a boost controller tonight n car was running fine on 10psi, after giving it a bit of stick in now idles from 1000rpm right up to 2000rpm at idle by itself and while driving?? Checked for vac leaks and cnt find any? Confused :(

D.I.Y. Mik Veteran

D.I.Y. Mik

Posted
Posted

Aac valve clean?

Block off cold start valve.

Does it idle normally if you switch it off for a second then start it again?

Mine does that. Blocking the cold start valve helped but didnt fix

come to think of it... it started on mine after i installed the boost controller.

I got the HKS evc4, what one do you have?

Maybe we should unhook the boost controllers and see.

blind_elk Grand Master

blind_elk

Posted
Posted

My car revs to 2grand and back to 1200 constantly at idle not jst sit at 2000 if that helps...

My experience is that that sort of idle indicates a fairly significant air leak. It could be in the boost controller, but you need to closely inspect every vacuum hose, especially the larger ones (like PCV to rocker hose).
R34gymjunkie Contributor

R34gymjunkie

Posted
  • Author
Posted

I think it's mechanic time, I stripped nearly all pipes n hoses today on the engine to inspect them, cleaned AAC, I'm not sure witch one is the cold start valve, I tried adjusting the tps, and aic? Still got no clue :(

D.I.Y. Mik Veteran

D.I.Y. Mik

Posted
Posted

Hmmm....

After reading that id say the ECU is the problem.

With all the upgrades it needs tuning.

Well thats next on my list anyway, im just trying to get as much sorted out as i can before i get the ECU and tune.

So i might let the mechanic sort this one out.

mattis96 Proficient

mattis96

Posted
Posted

wow i have exactly the same problem!!! It only happens on first start up and has to warm up to go back to normal. after i turn the car off and back on again it idles at 1000, it is very annoying, and this can be just sitting idling there, warm up for 10 mins with touching nothing, turn car off, turn car back on again with touching nothing and it is fine.

nothing gets touched or changed except it is restarted once warm and its fine, though if its not warm enough the idle creeps back up to 2500 until restarted again...

  • 1 month later...
GTR260 Proficient

GTR260

Posted
Posted

The car is designed to do what it is doing, the ecu is seeing the revs rising whilst the tps is at 0 and goes into decel to control the revs once the revs are low enough go back to normal and the revs climb again. It will keep repeating the process! My rb26 was doing this for ages and no mechanic could fix it! I end up finding the problem myself, mine was a bent butterfly on cylinder 1, ur engine is getting a significant leak from somewhere between the throttle and the head. Could be buggered throttle shaft seals or any of the gaskets between there snd the head! Even the injector seals! Either way its a air leak.

How much boost were u running when it happened? What engine and where are u? I could give u a hand to try fix it if u r local to me

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
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Unpeeling the Orange

      By MBS206 · Posted

      I'm normally copping my own abuse from neglecting my daily drivers. "Those suspension bushes will last a bit more", "Don't worry about the oil leak, just keep topping it up". The project cars I'm always doing things slowly on them as I'm wanting them to be done better, and neater, and nicer. Luckily I don't have to deal with 18 year old Matt's "Learning to wire" stuff in the project cars. And there's only one piece of wiring I'm displeased about in the Landcruiser, and it's about to be cut out... However, the box loads of parts that have been going through this place lately for the Landcruiser... Brake pads Brake Rotors Full handbrake overhaul Wheel Bearings Seals Swivel hubs Steering Boxes Half the suspension joints Shocks Air bags (Ones to go in the rear springs for towing) Water pump Timing kit Lower timing case Harmonic Balancer Radiator Lots of other little seals and shits Gas struts for the bonnet New power window switches And god knows what else I've forgotten... Ha ha ha I have my fingers crossed the pinion seals don't start leaking on the diffs, that the transfer case doesn't leak, and the gearbox input shaft doesn't leak, nor the rear main seal. As they're about the only seals I haven't replaced in the driveline! I'm seriously eyeing off buying new caliper rebuild kits front and rear brake calipers... I'll probably recheck all the valve clearances soon too, and hopefully, it should be all good and sweet to haul some long distance trips again!
    • GTSBoy
      Unpeeling the Orange

      By GTSBoy · Posted

      Every time I pull my 3x gauges out of the console and see the crack-addict way that I did the wiring, and I just can't bring myself to tear it all apart and "make it nice", because it is currently working. In fact, the last time I was in there I probably made it worse.
    • Kinkstaah
      Unpeeling the Orange

      By Kinkstaah · Posted

      The best part is when you own the car long enough that you look back and find your OWN ham fisted amateur shit!
    • MBS206
      Unpeeling the Orange

      By MBS206 · Posted

      The annoying part about neglect, is when you start to replace one thing, and find ten more broken things. Ham fisted monkey repairs you normally only find out about when trying to do something unrelated! Ha ha   Neglect you can kind of anticipate the huge costs to fix it all. Ham fistedness is normally a shock the first time your work on a new old car, as everything "looked" good before.
    • MBS206
      What brakes on R34 GTT(Europe)

      By MBS206 · Posted

      For DBA, check out their guide table here. https://dba.com.au/wp-content/uploads/2023/01/Direct_Replacement-Guide-2021.2.pdf   Additionally they have some other guides and info on how to make sure you choose the right pad.
×
×
  • Create New...