Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: Idle at 2000rpm

  1. 6th October 2013, 05:24 PM #1
    johnyrover
    johnyrover is offline Master
    Join Date
    Mar 2013
    Location
    Tweed Heads NSW
    Posts
    148
    Total Downloaded
    0

    Idle at 2000rpm

    Hi guys. Got a tricky one. Since I live 1.5hrs from the nearest wallet drainer, I thought I'd run it past you. The beast has been running like a dream for the last 20,000k's, but I started it up the other week and it went to 1200rpm on startup at idle. Over the next week or so it went up to 2000rpm. This was the only symptom that something was wrong. I have searched high and low for an answer and they all seem to correspond with other symptoms that my car does not have. So far I have ascertained that the stepper motor is clean, closes on shutdown then pulls back a bit. I have adjusted it manually to where it does not over rev and disconnected it. I have cleaned the throttle body and the MAF. There are no air leaks. The whole rig is running really smooth with good economy 13.5l to the 100k at standard height (on coils). There was a mild surging at idle which has all but subsided after cleaning the throttle body. I think if anything the IAC could have been pulling back a bit far, because It is practically at the closed position now. Idle is now at 700 cold up to 900 hot.
    A Nanocom Evo is on the Christmas shopping list. The hotty is a bit tired of the obsession.
    Any thoughts would be cool.
    Thanks guys.
    Reply With Quote Reply With Quote
  2. 6th October 2013, 05:55 PM #2
    mick88's Avatar
    mick88
    mick88 is offline Lord Jock
    Join Date
    Jan 1970
    Location
    Irymple, Victoria, Australia
    Posts
    2,902
    Total Downloaded
    0
    I may be way off the track but i had a Daihatsu diesel do that once and it had a leather diaphragm on the fuel pump that had perished.


    Cheers, Mick.
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
    1969 BSA Bantam B175
    Reply With Quote Reply With Quote
  3. 6th October 2013, 06:01 PM #3
    PhilipA
    PhilipA is online now Swaggie Subscriber
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    14,152
    Total Downloaded
    0
    Usually on a 14 CUX the IAC OPENS fully on shutdown. Thsi is to ensur eit gets exercised and doesn't become sticky . Ha ha .
    That is why you get high revving for a while when it gets sticky.
    I think that GEMS would be similar.
    I assume GEMS as you don't state which model.
    On Thor the IAC is much more powerful and a different system of a sleeve valve.
    Look a petrol engine MUST have an air leak if it is idleing fast as the throttle blade "throttles " the air into the engine. Have you checke dthat the throttle blade and area is clean? The only other reason could be excessive advance., or maybe long shot FPR staying rich on GEMS only( maybe not even GEMS).
    Regards Philip A
    Reply With Quote Reply With Quote
  4. 6th October 2013, 06:02 PM #4
    johnyrover
    johnyrover is offline Master
    Join Date
    Mar 2013
    Location
    Tweed Heads NSW
    Posts
    148
    Total Downloaded
    0

    Anything but the fuel pump!

    Thanks Mick. I'll check it out. I was hoping no-one would say the f word.
    Cheers
    Reply With Quote Reply With Quote
  5. 6th October 2013, 06:11 PM #5
    Keithy P38's Avatar
    Keithy P38
    Keithy P38 is offline AT REST
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,581
    Total Downloaded
    0
    You have probably already checked, but I am going to state the obvious anyway!

    Have you checked all vacuum lines and any of those additional ports on the intake manifold? Even a quick check of the torque of your manifold bolts might bring up something!

    Do the gems v8's run vacuum booster for the brakes? I suppose they would/should be the same as a Thor.

    Cheers
    Keithy
    Reply With Quote Reply With Quote
  6. 6th October 2013, 06:15 PM #6
    johnyrover
    johnyrover is offline Master
    Join Date
    Mar 2013
    Location
    Tweed Heads NSW
    Posts
    148
    Total Downloaded
    0

    Yep a GEMS, Philip A.

    Sorry bout that. What is FPR? Both myself and the local mech had a good spray, and checked the vacuum lines. Pretty sure not a leak. I also gave the butterfly area a good clean as there was a definite build up in the form of a black ring. That evened out the idle a bit but also raised the idle a tiny bit.
    Cheers.
    Reply With Quote Reply With Quote
  7. 6th October 2013, 06:22 PM #7
    johnyrover
    johnyrover is offline Master
    Join Date
    Mar 2013
    Location
    Tweed Heads NSW
    Posts
    148
    Total Downloaded
    0

    Hi Keithy

    Yep checked vacuum hoses and sprayed like a tomcat. The intake manifold/valley gasket was changed not long before this started, so I hope they know what they were doing. I did not consider them overly conciencious but they seemed capable. I have not seen anything that looks like a vacuum booster for the brakes, rather I think the accumulator does the same job as well as maintains pressure for the ABS.
    Cheers
    Reply With Quote Reply With Quote
  8. 6th October 2013, 07:03 PM #8
    Hoges
    Hoges is offline YarnMaster Subscriber
    Join Date
    Aug 2007
    Location
    Brisbane
    Posts
    3,234
    Total Downloaded
    0
    FWIW: surging can be a symptom of a failing throttle positioning sensor (TPS). Presume you have checked the clearance of the throttle cable/cruise control cams as well?
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)
    Reply With Quote Reply With Quote
  9. 6th October 2013, 07:10 PM #9
    PhilipA
    PhilipA is online now Swaggie Subscriber
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    14,152
    Total Downloaded
    0

    Sorry bout that. What is FPR?
    Fuel Pressure Regulator
    Regards Philip A
    Reply With Quote Reply With Quote
  10. 6th October 2013, 07:55 PM #10
    johnyrover
    johnyrover is offline Master
    Join Date
    Mar 2013
    Location
    Tweed Heads NSW
    Posts
    148
    Total Downloaded
    0

    Thanks Philip. Hi Hoges.

    TPS did come up in my research, found a manual test to assess the voltages. (Looking forward to the Xmas pressy Nanocom !) I'll know soon enough if it is the TPS as this starts messing with the gearbox in a big way apparently. If by cams you mean the slack in the cables from the accelerator and the cruise control, then yep, they have just a tiny bit of slack in both and are seated. Also the butterfly is closing perpendicular with no gap. Phillip A I'll start researching FPR.
    Thanks guys
    Reply With Quote Reply With Quote
Page 1 of 2 12 LastLast
« More power inside | diesel into P38 »

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!