Jump to content
SAU Community

Air filter causing miss at idle???

sumfatchin

By sumfatchin,
in Engines & Forced Induction

 Share

Recommended Posts

sumfatchin Enthusiast

sumfatchin

Posted
Posted

I recently Swapped my K&N Pod filter with a HKS air filter.

When i first installed it, everything seemed to be running fine, but a couple of days later the car started to sound really rough at idle. The rev's dont seem to vary much, but the car now shakes a bit at idle and a kind of farting noise comes from the exhaust. I can't really tell if it's RPM 'hunting' or if its some kind of miss.... any ideas???

Link to comment
https://www.sau.com.au/forums/topic/25127-air-filter-causing-miss-at-idle/
Share on other sites
sumfatchin Enthusiast

sumfatchin

Posted
  • Author
Posted

cheers, just tried reseting the ecu (the only easy one to do), was stoked cause at first it idled fine, then revs dropped a bit and it started to go rough again. Maby i should take it out right now and thrash the tits of it... yeah ill go do that:)

Cubes Grand Master

Cubes

Posted
Posted

I've got the same problem. Always have, My afm plug is a little dodgy as once on the dyno when the afm was fitted the ecu went in to limp home mode. + lots of black smoke out the exhaust.

We then swapped afm's and all was fine.

Then pluged mine back in and it was ok.

I've come to accept it.. Bump the idle up to around 850rpm and it is ok.

Cubes Grand Master

Cubes

Posted
Posted

On the back of your plenum there is a ACC valve. The idle screw is in that. It is nearest your firewall. It also has a plug leaving it and a what looks like 1/2" hose going to it.

Bring the car up to operating temp then adjust it. You have to come at it from in front of your clutch master cyclinder there abouts.

Do a search on the ACC valve I posted a pic quite some time ago now.

Guest RedLineGTR

Guest RedLineGTR

Posted
Posted

but if it was working fine with the older filter u shouldnt need to adjust it. Clean the AFM reset the ecu and give it a drive for a little bit see over a couple of days and then try the idle setting adjustment. Why did u get a HKS filter for...they dont filter good at all the only thing they filter is rocks and birds :) But thats your choice so it will give u a feel in the difference when revving but at a cost. Anyways hopefully it works out fine.

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
      R32 GTST - 600KW+ RB28/CD009 Build

      By GTSBoy · Posted

      Structured text and other high level PLC programing languages are not allowable in Functional Safety. They are very difficult to audit. My PLC stuff is almost exclusively oriented towards Burner Management Systems which are a particularly pernicious form of Safety Instrumented System, when implemented in an SPLC. Even the part of the code written to work in the non-safety logic part of the PLC, like with a Siemens S7-1500 series, still needs to be treated as if it was safety code, with access restrictions, code fingreprints and the like. And Allen Bradley can go EABODs. They ae full of shit. They have this whole lie going on where they say if you use a ControlLogix controller and its IO, and then just duplicate the IOs (ie, run in series or parallel depending on type, to try to make it "fail safe") and "use these programming styles and place these restrictions on what you do" that you can achieve SIL2. What a load of crap. They just get away with it because no-one in the US seems to understand the first thing about Functional Safety and carries on as if all they have to do is buy only SIL2 rated equipment and hey presto, it's a SIL2 system. Idiots. /rant
    • MBS206
      Magnetic Drain Plug Snapped in Half

      By MBS206 · Posted

      If you're really considering leaving it, a great question to ask is, is the magnet going to stick to the sump? The answer to the above is the same answer towards if I'd have any level of comfort leaving it... Personally, based on the cost of a motor if the magnet were to cause damage, I'd be fishing it out either way. Use the methods in here. It fit in through the plug hole, it'll come out.   PS, get a small actuatable claw for a bore scope. OR if you know a vet, they have really cool controllable scopes with hooks on the end. Supposedly they're like playing a video game. Ask if they can acquire you one of their scopes... Engine oil after all is just a different type of lube right? Will only make it easier on the next dog or cat...
    • MBS206
      R32 GTST - 600KW+ RB28/CD009 Build

      By MBS206 · Posted

      All other (Boolean) logic functions though, are just built on those blocks above. Which does give you a lot of functionality in logic. It is basing that on using thresholds with analogue signals like GTS alluded to.   Not having things like timers will make it less useful for some of the ramp up logic you'd want, and again, on Haltecs capacity specifically, I'm not across anymore what you can / can't do with different tables.   I'm assuming, with your logic you want to implement, not only do you want your timing safeties, you're wanting to be able to derive the duty cycle for your solenoid, to maintain I'm assuming 175PSi? Or are you using a standalone WMI controller to maintain the DC correct, and you just want the Haltech working out which fuelling maps you should be on?
    • MBS206
      Low oil pressure after WOT

      By MBS206 · Posted

      It doesn't seem to follow revs. Oddly it seems to follow TPS a little bit from what I can see, but with some delay a bit. IE end of the graph, when he lets off throttle fully, pressure drops a lot, then slowly builds back up, but rpm is on a nice cruisey drop off. I do agree though, it seems very electrically.
    • TurboTapin
      R32 GTST - 600KW+ RB28/CD009 Build

      By TurboTapin · Posted

      I just try to entirely stay away from ladder now unless it's something basic maintained by electricians. Even then and to your point, it mostly ends up being blocks I wrote in structured text.  PLC's are slowly going towards C, C++ and C#. I just wish Allen-Bradley would jump on the bandwagon. 
×
×
  • Create New...