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idle bounces when cold engine

Discussion in 'General Explorations!!' started by derekpw, September 21, 2002.

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  1. derekpw

    derekpw New Member

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    '97 xlt sohc v6

    When first starting with a cold engine, the idle goes up and down several times during the first minute. Kind of bounces. Any ideas on this? Thank you.
    derek
     
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  3. Alec

    Alec Elite Moderator Moderator Emeritus

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    What's the range that it goes up and down? Is it a very rapid change? Does it always smooth out after the engine is warm?

    It's normal for the truck to idle hunt a bit when it's cold, just not excessively.
     
  4. Robert

    Robert Well-Known Member

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    If the idle bouncing is excessive or if you have had it for a while and are just now seeing the idle acting differently then it is likely your lower intake manifold o-rings. Do a search for 00M12 to find out how Ford will pay to fix it.
     
  5. derekpw

    derekpw New Member

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    more info

    To describe it a bit further, this only happens when cold,
    the idle drops down to just above stalling, then creeps slowly back up to about 1500, then slowly back down, then back up, and on and on. This usually happens for less than a minute and then idles normally. I never see it happen on a warm or hot start up.

    ... and this only just started happening over the past week or so.

    As far as the 00M12 recall, my truck now has 94k on it and I believe that is for those with 72k or less. So, I am outa luck.
     
  6. Jason_25

    Jason_25 Elite Explorer<br>ECX Member

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    Sounds alot like a vacuum leak to me as well. I would get it looked at by a reputable mechanic.
     
  7. derekpw

    derekpw New Member

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    o-rings

    Is this related to the lower intake manifold o-rings?

    Last time I had it at Ford Repair (88k, now at 93k), they said to get the chain tensioners and o-rings replaced. For several hundred dollars. That was to solve the tapping noise that I have had since purchasing it new. Since my mileage is above the recall mileage, they won't cover it.
     
  8. Jason_25

    Jason_25 Elite Explorer<br>ECX Member

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    Re: o-rings

    Yes. As Robert mentioned above, it is likely your o-rings drawing unmetered air into the motor.
     
  9. dogfriend

    dogfriend Human-Animal Hybrid

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    Are the o-rings you guys are talking about the seals where the injectors go into the intake? If so, is it a difficult job to just go ahead replace them yourself?

    The reason I'm asking is that I had a 2.9L Ranger, and it wasn't that difficult to replace the injector o-rings. I don't know about the SOHC engine though.

    I think he could save by doing the intake himself if he can't get Ford to pay for it. The tensioner repair sounds pretty difficult though.
     
  10. TPLYNCH

    TPLYNCH Well-Known Member

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    Since this is a problem common to the early SOHC engines, try and get Ford to cover at least part of the cost. May mean bitching (LOUDLY) to the dealer and to Ford Customer Service, but if you're persistant, you may get them to knock off at least half the cost. Others on here have done it, you can too!

    You can also try cleaning the IAC to see if that helps the idle hunting as well...
     
  11. Robert

    Robert Well-Known Member

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    Dogfriend - no the o-rings are for the o-rigns that seal the lower intake manifold to the top of the cylinder block. Both the upper and lower intake manifolds need to come off as well as everything else that is in the way. Ford allows about 3 hours for warranty work to do both the o-rings and the tensioners. A non-professional mechanic will probably double that time.
     
  12. dogfriend

    dogfriend Human-Animal Hybrid

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    yeah, that sounds like at least a full days worth.....

    never mind :)

    Why did they use o-rings instead of a gasket, anyway? I hope they came up with better o-rings for the replacement.
     






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