Volvo RWD 700 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 12/2004 700 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

740 Wagon - 'Honking' resonance at 950 rpm 700 1991

posted by  someone claiming to be Dans on  Mon Mar 29 07:08 CST 2004 [RELATED]


I've been chasing some problems with my wagon over the last few months...
I'm still having some issues with stalling in very very wet weather
I've put on new wires and distro, but water seems to be thrown up the back of the
engine in real wet weather (there was a shield spot welded to the exhaust on the right side below the engine, that's long gone, and never had any problems till this winter but I think the new wire from the ign coil where it goes into the distributor cap had some moisture in it... that may have wicked in where the wire goes into the boot...I've sprayed it with protectant to see if that helps..
Meanwhile while I had my head in the engine compartment I started gently bringing the revs up from idle to 1000 rpm.. when
I noticed an odd resonance at about
950 RPM brings on a loud "honking" sound that seems to be on the intake side of the engine..tried listening with a stethscope but can't pinpoint it...
although it seems to be around the ICV but not really convinced of that...
if I hit the resonance just right the engine falters...
TB has just been serviced with new gasket, flame trap and PCV all cleaned out
ICV looks ok... but the idle hunts a bit up and down...

anyone hear this "honk" on a normally aspirated B 230 f?

thanks
Dans








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

    740 Wagon - 'Honking' resonance at 950 rpm 700 1991

    posted by  skydvr on  Mon Mar 29 09:15 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sat Dec 1 01:26 CST 2007
    [RELATED]

    Dans,
    I have seen this problem on hundreds of 240,740,940's all with b230 engines, both turbo and normally aspirated. The problem is usually one of two things, either a loose or broken intake manifold gasket or the o-ring that seals the oil seperator to the engine block either one causes the misfire you speak of. good luck!!!








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      740 Wagon - 'Honking' resonance at 950 rpm 700 1991

      posted by  someone claiming to be dans on  Mon Mar 29 13:53 CST 2004 [RELATED]

      I'll try spraying around the intake manifold gasket..
      is the oil separator part of the flame trap assembly?...

      Also I wonder if this could be the cause of my stall out problems in wet wx,
      and the odd idle hunting...
      too......we will see tomorrow..

      thanks...now this is getting closer to a solution..
      engine has 122,000 km on it, the intake manifold gasket
      is original ...

      Regards
      Dans








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

        740 Wagon - 'Honking' resonance at 950 rpm 700 1991

        posted by  skydvr on  Mon Mar 29 14:42 CST 2004
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Sat Dec 1 01:26 CST 2007
        [RELATED]

        dans,
        the oil seperator is the black plastic box under the flame trap assembly, it is held on by 2 eight millimeter bolts(12mm head( and an 8mm head screw holding the wiring harness. this part likes to clog as well so be sur and clean it out while you are there. good luck .......have fun








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          740 Wagon - 'Honking' resonance at 950 rpm 700 1991

          posted by  someone claiming to be Dans on  Wed Mar 31 04:23 CST 2004 [RELATED]

          Took a can of ignition sealer (clear lacquer) and sprayed around
          the intake manifold...drove around and the idle hunting is gone.
          I'll check the manifold nuts to see if they are tight...and probably get
          it changed out...my mistake this was the second gasket to be fitted on the
          intake, but it hasn't been changed for many moons now..also need to do
          the exhaust side as well....

          thanks Dans








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

    740 Wagon - 'Honking' resonance at 950 rpm 700 1991

    posted by  VolvoSteel on  Mon Mar 29 07:22 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sun Mar 23 21:28 CST 2014
    [RELATED]

    The stalling issue in wet weather, i would check the passenger side door wire boot, mine failed and in wet wet weather would let water in which promptly fell onto the ECU.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      740 Wagon - 'Honking' resonance at 950 rpm 700 1991

      posted by  someone claiming to be Dans on  Mon Mar 29 08:05 CST 2004 [RELATED]

      ok, the boot on the drivers side is cracked...
      I'll check the pass side too presume this is the one that brings the wires
      through from the door?.....pulled the kick panel off yesterday
      everything looks dry...pad isn't wet...but I'll take a careful look.
      Fun problem....as it only manifests itself when making like a submarine
      ...ie. hard heavy rain with lots of water splashing....
      Dans








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

        740 Wagon - 'Honking' resonance at 950 rpm 700 1991

        posted by  VolvoSteel on  Mon Mar 29 09:48 CST 2004
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Sun Mar 23 21:28 CST 2014
        [RELATED]

        Yea i had the same result's, it wasnt until i actually took it off right after it rained did i find any water, then i went forth and took the ECY cover off to find water spots and residue all over the chip board, hence when it dried up everything went back to normall. and yes it is the wire from the door, since you found yours cracked i have found a nice and nifty way to seal the area, i took some High Temp silicone ( since thats what i had on hand ) and filled the boot holes on the inside, never leaked again, did the same on the drivers side, its still flexable enough to let the wires move around but will create a seal.








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          740 Wagon - 'Honking' resonance at 950 rpm 700 1991

          posted by  someone claiming to be Dans on  Tue Mar 30 05:57 CST 2004 [RELATED]

          I filled it up last night...the passenger's side rubber around the wires looked ok
          but where it went through the body I think the seal was gone...so filled er up..
          last summer I had water in there when the drain clogged with the AC running and the water backed up into the fan motor and soaked the floor and the 'brain"...
          Been trying to figure out how to open up the AC / Heater case to clean the gunk
          out...Dans







<< < > >>



©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.