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98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

posted by  dirkw2@yahoo.com on  Wed Apr 17 08:41 CST 2002
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We own a '98 S90 with 61,300 miles on it. We've owned it for 4 months to the day. It has been to 2 mechanics for the check engine light, which when diagnosed returns the code for a small vapor leak in the fuel system. The first mechanic was an independent with over 30 years in the Volvo biz. He literally gave up on the car and referred me to a local dealership.

We have replaced the following:
gas cap
fuel tank
some shut off valve (replaced twice)
2 hoses
charcoal filter

The computer module has been removed and replaced with a new one to determine if it is malfunctioning. Not the case.

I've done my research on this site and have found many instances of the same problem but none really give a conclusion to the problem.

Does anyone have *any idea* what a final fix is????

HELP!!

dirkw2








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    98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

    posted by  someone claiming to be Chris Regensburger on  Wed Apr 17 13:07 CST 2002 [RELATED]

    ecm-612 is tank pres. sensor, open circut. could be the sensor or a wiring problem, the tank must be dropped in order to replace the sensor.








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    98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

    posted by  Token Ring Man on  Wed Apr 17 10:39 CST 2002
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    Dirk, I noticed you're getting close to a timing belt change. It is required at 70K miles. Do NOT put this off. Catastrophic engine destruction will occur after that mileage. Yes I'm trying to scare you. Don't let it go signifantly past 70K miles.

    I don't have any 960 manuals, yet, so I have nothing to offer on your code problem. Good luck and let us know how it goes.
    --
    Warren Bain - '86 744Ti M46 >290Kmi, '99 V70Glt > 45K mi, '96 965 >100Kmi Wifemobile near Manassas Va.. Check the 700/900 FAQ via the 'features' pull down menu.








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      98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

      posted by  dirkw2@yahoo.com on  Thu Apr 18 02:44 CST 2002
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      Advice is appreciated-- timing belt was first thing I did when purchased at 56k.
      dirkw2

      PS-- How important is the 60k tune-up, plug change, etc.? When they ran down the list for me nothing struck me as important enough to spend the $$ on at the time.








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        98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

        posted by  Token Ring Man on  Thu Apr 18 10:14 CST 2002
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        Changing the plugs is fairly easy, you will also need a new flame trap, or clean the old one, and a new air filter (possibly later, check the owners manual).

        Use synthetic oil, such as AMSOIL or Mobil 1, a MANN/Volvo filter. Check for leaking oil filter adapter O-rings and replace them. It's easy. Examine all the coolant hoses for weak spots or leaks. Use Volvo coolant which is very expensive, but will not damage the engine. Dexcool is not recommended for this engine.

        --
        Warren Bain - '86 744Ti M46 >290Kmi, '99 V70Glt > 45K mi, '96 965 >100Kmi Wifemobile near Manassas Va.. Check the 700/900 FAQ via the 'features' pull down menu.








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    98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

    uid 19's pic
    posted by  jbowers on  Wed Apr 17 09:07 CST 2002
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    last visit: Sun Jan 22 13:49 CST 2012
    [RELATED]

    In reality, none of the independent's 30 years of experience counts on this OBD-II control system. I'll look in my manuals for ideas and report tomorrow. I wouldn't let anyone replace another part until they have positively diagnosed the problem.

    It seems like people have been guessing and trying for the quick fix, without following the entire diagnostic procedures!

    Why did they replace the tank? Did it actually have a leak? Maybe when they replaced the tank they screwed up reinstalation of the "tank unit". It's trickey to get right. I just had to replace my fuel pump and I can tell you if they didn't follow the manual carefully reinstalling the tank unit isn't trivial. With a new tank, there should have been a new seal, a nut etc.

    What is the code that is being reported. Is it a generic "P" code from a less expensive generic OBD-II scanner or does the shop have a real Volvo scanner that can actuate various valves etc. to confirm a repair?
    --
    '96 965 at 89K. Had '85 745 Turbo Diesel for 200K.








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      98 S90-- AT MY WIT'S END!!!, vapor recovery code #612 S90-V90

      posted by  dirkw2@yahoo.com on  Wed Apr 17 09:26 CST 2002
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      --Fuel tank did actually have a hole in it as confirmed by our extended warranty rep. This instance gave code 611.

      --Generic vs. Volvo scanner: the last fix (valve & charcoal filter) was done by the dealer so I assume they've got the best tools. Continues to be code 612.


      Other notes:
      --I've read where some have experienced similar problems only to see the light go off by itself (?).

      --After being in the shop, it has taken anywhere from 60 to 1,300 miles before the light and code reappear. This time (today) it went for 284 miles before coming on again.

      --Code *usually* (not always) appears below 1/2 a tank of gas.

      --Driving from LA to Vegas this coming weekend. At this point, I'm willing to see if the light produces any other problems while on the road.

      --As of last Fri. (Apr.12th) dealer said with confidence that it was fixed and the parts replaced were the actual culprits!

      Your interest and attention is appreciated!
      dirkw2







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