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Thread: 3.0 dohc merc mystique surge

  1. #1

    3.0 dohc merc mystique surge

    Grannies car has a problem...when cold it wants to pull thru stop signs...I put it in neutral and rev it slim bit and it's fine...also struggles going up hills unless I drop it into that gear manually...any ideas???

  2. #2
    Senior Member
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    Ignition issue? If it's chugging under load and clearing up in the higher rpms that's my guess. CEL on?

  3. #3
    It's on but haven't read it yet... It was on before and said o2 sensor...so I changed but no difference and light came back on now...never thought of ignition...hmmm..had timing belt changed and cam pos. Sensor,,plugs,,o2...

  4. #4
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    Is CEL flashing? I'd scan the comp. for code and go from there....

  5. #5
    No Traction due to Paxton PaxtonShelby's Avatar
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    Is that a symptom of a bad throttle position sensor?
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  6. #6
    Not flashing just stays on...vacuum maybe???

  7. #7
    Almost feels like tranny vacuum but its probably something simple like an unplugged sensor or something...

  8. #8
    Powder Coat Rocks! CollinsPC's Avatar
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    Does this have the stock 2.5 or does it have a transplanted 3.0?

    I don't have my Contour any longer, but still am a member here; http://www.contour.org/ceg-vb/forum.php

    There are a lot of helpful members there.
    Last edited by CollinsPC; 03-02-2014 at 05:53 PM.
    Randy

  9. #9
    Oh damn...I put 3.0 sorry....yes 2.5...don't know what I was thinking...lol

  10. #10
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    The whole reason for the CEL is to check the code and point you on the right direction....Kinda shooting in the dark with a bunch of guesses.

  11. #11
    Yeah I know but it said o2 sensor...I changed it and it's still has the problem and light came back on...just getting some more ideas...

  12. #12
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    Not trying to start an argument, trying to help....but you mentioned you haven't read it yet. Could be something totally different.

  13. #13
    Yeah Im gonna have to dig alil bit...I used advances reader...I wish I had snap on reader...

  14. #14
    Hangin' with my toddler. Silverhatch's Avatar
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    my sct reads mine.

  15. #15
    Yeah I will be buying 1 soon...I had the innova but some shady character stole it from my garage...I've been waiting to buy 1 when I get a new terminator...

  16. #16
    RRT juice_man_86's Avatar
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    Timing belt was changed...maybe a tooth out

    Sent from my Moto G
    2014 Mustang GT m6 - 12.97@111
    All stock down to the tires
    12.53 on slicks. Stock. No tune.

    1986 Mustang 5 speed - 12.10@110 off the sauce
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    Tuned by Tim @ Rodeheavers Hotrod & Dyno Shop

  17. #17
    Cat was clogged...as soon as I tap it I could hear the junk in it...

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