Jump to content
SAU Community

Weird Noise Around 1500rpm

STLKHR

By STLKHR,
in Engines & Forced Induction

 Share

Recommended Posts

STLKHR Enthusiast

STLKHR

Posted
Posted

Hi guys this one seem's like a hard problem to find!

At idle there is a rubbing sound noise (rubbing is the best description i can come up with) it take the revs up just past 1500rpm, it then goe's away! i rev up to 4000rpm and take my foot off and around 1500 rpm it will hesitate before dropping to idle 900 rpm, as soon as it hits 1500rpm the rubbing/grinding noise comes back.

Now i was thinking is it like a belt that sort of comes right when you get to a certain rpm (like an unbalanced wheel, you drive through the unbalanced point), but then i was thinking why does the motor hesitate right at the point it starts making the noise?

Has it got something to do with the VCT?

Anyone had this prob or got any ideas? cheers

Link to comment
https://www.sau.com.au/forums/topic/289026-weird-noise-around-1500rpm/
Share on other sites
mad082 Grand Master

mad082

Posted
Posted

is it like a rubbing noise or could it be a vibration in a belt? the reason i ask is that it may possibly be a pulley bearing causing a vibration in a belt when at a certain speed. an example of this is a semi common problem with SSS pulsars where the aircon belt vibrates at idle when the aircon is on and the moment you blip the throttle it goes away. new bearings in the pulley seems to solve it for a little while.

other possilbe causes could be air in the power steering pump (or just low fluid) but that will generally be all the time and get louder as you turn the steering.

the revs dropping to 1500 then down to idle is pretty normal as well. i have owned lots of cars that do that.

STLKHR Enthusiast

STLKHR

Posted
  • Author
Posted

How loud is it? my car also hesitates before dropping to idle sometimes but it doesn't make any weird noises

[/quo

Hey guys, im picking it must be a belt then i just thought it weird due to the revs hesitating at the point it starts rumbling, does not miss at all. will check my cambelt as i am picking its that, may just take a belt of at at time to slowy eliminate each possible prob.... so allot of cars hesitate for half to a whole sec around 1500rpm when throttle is released? weird..

cheers

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

    • GTSBoy
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By GTSBoy · Posted

      I hadn't thought about the variable power steering assist. Presumably, it will always be the same level of assist as you get in an S14. The R32/3/4 are either helliishly heavy (at low speeds) if the solenoid is not powered at all, or hellishly too light (at high speed) if it is powered all the time. I presume that it is PWM controlled on those cars. I hadn't thought about the S cars not having variable assist. ugh. What crappy plebby cars they must be!  
    • Gantai
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By Gantai · Posted

      Hmm yeah that is a good point. It looks like it'll just bolt in with no real issue besides maybe the bushings being different. My other concern was that 2 pin plug that I assume is used in some way to control the rack solenoid depending on the speed signal from the ecu. The DMAX rack doesn't even have that plug though so, don't think it'll matter. Might just order the rack and see how it goes. Will update this when I figure something out
    • GTSBoy
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By GTSBoy · Posted

      I'd say it's a fair bet that the feed and return fluid lines will be in different enough spots that you would need to come up with a way to cut the originals short and adapt with new hard line adaption or braided teflon hoses or somesuch. But really, you have the car, you have the photos of the DMAX rack - you should be able to go out there and see for yourself whether they're in the same or different spots.
    • Gantai
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By Gantai · Posted

      I've been doing some looking around and honestly was just considering throwing a new rack at it. I saw that the dmax silvia rack bolts up into the 33 with the silvia bushings but not sure if the high pressure lines will sit in the correct spot. I believe other version of the 33 rack are the same/similar to the racks that can be opened up without as much fuss so I assume the dmax rack would fit but any ideas?
    • GTSBoy
      R33 GTST Steering Rack (49001-19U05) Rebuild?

      By GTSBoy · Posted

      I've never played with one, but I would expect that you are correct. That slot looks like it is intended to be used to unscrew the end, and the flats on the body would be better than grabbing it around the round bit with a pipe wrench. So, yeah, probably unscrews. You'll probably have to make a tool to drive in that slot.
×
×
  • Create New...