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Thread: Fluctuating / bad idle

  1. #21
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    Quote Originally Posted by AndyW View Post
    Hello all. I think we have found the Problem. My mechanic did a pressure test at the inlet and outlet valve. Everything was fine. Then he looked at the timingchains. One timing chain is loose. The other is tight. it looks like she's skipped a tooth.
    Now i order new complete timing Set.
    Andy - the timing chain guides are NLA but I have several of both sides (LGJ000090 & LGJ000100) in stock if you need them £40 for the pair posted, just let me know

    IMG_20200628_114452.jpg
    Last edited by ColinE; 28-06-2020 at 01:53 PM.
    Colin Ellis #456 It'll be alright in the end. If it's not alright, it's not the end

  2. #22
    #829 called 'Olive' David's Avatar
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    Quote Originally Posted by SCP440 View Post
    ... What is the scheduled change date/mileage on these engines? ...

    Steve
    Timing chains, tensioners, sprockets and guides is 150,000 miles according to Ford. MGR play the 'three-monkeys' and don't mention it. I assume back in 2004 they assumed that neither they, MGR, or any ZT260/R75V8 would survive long enough to find out that it should have been done !

    David
    Last edited by David; 28-06-2020 at 01:18 PM.

  3. #23
    #829 called 'Olive' David's Avatar
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    Quote Originally Posted by ColinE View Post
    Andy - the timing chain tensioners are NLA but I have several of both sides (LGJ000090 & LGJ000100) in stock if you need them £40 for the pair posted, just let me know

    IMG_20200628_114452.jpg
    Aren't those guides, Colin? Looks like there are two fixed guides, two pivoting guides and two tensioners. Example here:
    https://www.ebay.com/itm/Timing-Chai...-/253673710345
    ... (example only; that particular one is for a Mustang 2V up to 2000; later ones have a different lower crankshaft sprocket, I believe. Take care!)

    Lots of good timing-chain "how-to" videos on Youtube and this Ford instruction sheet: https://performanceparts.ford.com/do...4-462V.DOC.PDF

    David
    Last edited by David; 28-06-2020 at 06:38 PM.

  4. #24
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    Sorry more haste less speed, yes guides - post amended
    Colin Ellis #456 It'll be alright in the end. If it's not alright, it's not the end

  5. #25
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    Thanks all for the help and usefull information, especially the Ford instruction cheet.
    I orderd the timing Kit on Saturday from rockauto.com (USA).
    When everything is done i give a new Update.

  6. #26
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    So new Update. Everything rebuild. Car starts fine and doesn't Go out. The only Problem now is the idle. Idle now fluctuates between 500 to 1000 rpm.

  7. #27
    #829 called 'Olive' David's Avatar
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    Quote Originally Posted by AndyW View Post
    So new Update. Everything rebuild. Car starts fine and doesn't Go out. The only Problem now is the idle. Idle now fluctuates between 500 to 1000 rpm.
    Have you thoroughly cleaned the idle air control (IAC) valve? Sometimes a sticky throttle postion sensor (TPS) can cause that too, I hear.

    David

  8. #28
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    Now we put in the old iac valve. Fluctuating from 450 to 800 rpm. We did a test Drive. Accelerate ist verry good Till 3000rpm, then Acceleration breaks off and slowly takes on gas. We think there could be only two things now which are not working right. The fuel pump and or the fuel Filter.
    No error Codes

  9. #29
    #829 called 'Olive' David's Avatar
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    Quote Originally Posted by AndyW View Post
    Now we put in the old iac valve. Fluctuating from 450 to 800 rpm. We did a test Drive. Accelerate ist verry good Till 3000rpm, then Acceleration breaks off and slowly takes on gas. We think there could be only two things now which are not working right. The fuel pump and or the fuel Filter.
    No error Codes
    That sounds logical. Do you have the part number(s) of the timing chain kit or parts from RockAuto still? It would be good to know for other members who need to do the job (like me!). I assume they all fitted OK?

    David

  10. #30
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    Screenshot_2020-06-28-15-04-03.jpgScreenshot_2020-06-28-15-03-51.jpg
    These are the parts i bought
    Everything fits perfect
    Last edited by AndyW; 05-07-2020 at 04:43 PM.

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