Volvo AWD S70 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 3/2002 S70 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

S70 timing belt S70 1998

posted by  David Samuels on  Thu Jan 28 07:09 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon Oct 20 12:23 CST 2014
[RELATED]

Just back from a friend's place. Wife's S70 lost power leaving an intersection last night. This morning it won't start and from the sounds of things, the valves are a mess. Timing belt is intact, but it seems to have walked forward on the cam sprockets. What could cause that? Front cover seems intact at the bottom, but I can't really see. Our streets are still a mess from the storms. I can't help wondering if something didn't get in there and jump the belt. Opinions? Has anyone seen something like this?

DS








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    S70 timing belt S70 1998

    posted by  someone claiming to be Calvin on  Fri Jan 29 01:20 CST 2010 [RELATED]

    If you removed the timing belt cover, and found the timing marks to be
    in sync, you are done in that area. Try unpluging the MAP sensor. This is the big one between air filter and the intake manifold. See if the car starts. If it does, it won't run right, but it will run. Normally faulty MAP sensor will trigger CEL, but not always. Good luck!







    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      S70 timing belt S70 1998

      posted by  jadnhm on  Fri Jan 29 03:10 CST 2010
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Tue May 22 18:03 CST 2012
      [RELATED]

      careful about your terminology Calvin.

      The MAF (Mass Air Flow) is situated in-line in the intake plumbing between the air filter box and the intake manifold (on the turbos it's connected directly to the output duct on the air filter box - probably a similar location on the non-turbos).

      The MAP (Manifold Air Pressure) is situated in the front most pass side corner of the car behind the headlight housing and in front of the computer box.

      Be careful when un-plugging these things - never unplug any sensors when the ignition is in pos II or higher as you could cause serious damage to the computer which would be an expensive mistake to make.

      --
      1998 V70 AWD->FWD Turbo 200k+








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        S70 timing belt S70 1998

        posted by  someone claiming to be Calvin on  Fri Jan 29 08:08 CST 2010 [RELATED]

        OK, I was off with name, but correct with location.
        I'm sure he will know what I meant...







  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    S70 timing belt S70 1998

    posted by  KlausC on  Thu Jan 28 08:30 CST 2010
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    If the car was already running, that rules out cats and mice. The valve cover is still on, so you can't say that the timing is off. Is the serpentine belt still attached? Usually, if the Tbelt jumps that many sprockets, the tensioner pulleys may have died. But, if the engine turns over with the starter, then I find it hard to think that the valves are bent, etc. but, anything is possible.

    You need to take the cover off and get a flashlight to take a look.

    Klaus
    --
    Proud owner of a 220S. If I had more room, I would have more Volvos.








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      S70 timing belt S70 1998

      posted by  David Samuels on  Thu Jan 28 08:59 CST 2010
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Mon Oct 20 12:23 CST 2014
      [RELATED]

      Hey Klaus, you were the man I hoped to hear from. All belts are in place and tensioned. They sent it over to a shop, not a Volvo shop, but a good guy. I have to "facilitate". I asked them to take off only the front cover for now so we can see what's up with tensioners etc. and call me. When you crank the engine, you can tell only one or two cylinders are compressing. I'm very surprised that it was running yesterday, but won't start now. In cases like this you never really know if you are getting the whole story. For kicks, I'll let you know what we find if they get to it today.

      DS








      •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

        S70 timing belt S70 1998

        posted by  David Samuels on  Thu Jan 28 10:25 CST 2010
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Mon Oct 20 12:23 CST 2014
        [RELATED]

        Possibly, but it wouldn't crank like this unless something was out of time. I get three really quick beats with that high, whiny, starter-drive-only sort of sound. You know: da-da-da-daaaaanh, da-da-da-daaaaanh. Boy do I feel silly writing that.

        I'm familiar with the "bike/lawn mower syndrome". I don't think that's what's up though.








      •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

        S70 timing belt S70 1998

        posted by  KlausC on  Thu Jan 28 09:25 CST 2010
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        If there are no codes, could the rotor be at fault? The cam position sensor? The coil? All easy to check.

        If the spark plugs are all black and wet, you could have a bad vacuum leak and the engine just died from too much fuel - which would also wash the cylinder walls and reduce the compression.

        Lots of things to consider.

        Klaus
        --
        Proud owner of a 220S. If I had more room, I would have more Volvos.







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.