alleged solution to maf sensor problems . con or what ?

Discussion in 'General Motoring' started by timetobuyafordmethinks, Mar 26, 2005.

  1. timetobuyafordmethinks, Mar 26, 2005
    #1
  2. timetobuyafordmethinks

    delboy Guest

    Think this is what you are looking for :
    NO DOBOUT MOST OF YOU WITH ECOTEC CAVERLIER, CALIBRA,ASTRA OR VECTRA HAVE
    SUFFERED STALLING WHEN APPROACHING JUNCTIONS OR ROUNDABOUTS,MAYBE HAVING
    STOPPED AT A JUNCTION THE IDLE IS ERRATIC BEFORE THE ENGINE CUTS OUT OR THE
    IDLE WONT COME DOWN.

    NOT OT WORRY VAUXHALL HAVE A FIX!

    THE PROBLEM IS BAISICLY TWO FOLD FIRSTLY THE SMALL CRANK CASE BREATHER
    (SMALL HOSE FROM CAM COVER TO THROTTLE/INLET MANIFOLD)GETS BLOCKED AT THE
    BRASS FITTING IN THE MANIFOLD,THE FITTING HAS A VERY SMALL HOLE AND IS
    ATTATHCED SO TO DRAW CRANK CASE GASSES INTO THE MANIFOLD ON HIGH VACUUM,
    SUCH AS OVER RUN.

    THE EFFECT IS THAT ON OVER RUN WHILST APPROACHING A JUNCTION NO GASSES CAN
    BE DRAWN DIRECTLY INTO THE ENGINE, THE ONLY PATH IS THROUGH THE LARGE
    BREATHER HOSE AND THROUGH THE IDLE VALVE AROUND THE CLOSED THROTTLE, THIS
    SOON FOULS THE VALVE WITH STICKY CRANK CASE DEPOSITS AND OIL CAUSING IT NOT
    TO FUNCTION CORRECTLY, ALSO THE GASSES CAN AFFECT THE AIR MASS METER WICH
    MEASURES AIR FLOW BY THE COOLING EFFECT OF THE AIR OVER ITS HEATED SURFACE,
    SINCE THE GASSES ARE WARM A LARGE QUANTITY OF GASSES CAN CAUSE THE AIR MASS
    METER TO REGISTER A TROUBLE CODE "AIR MASS MERER VOLTS LOW" ADDING TO YOUR
    PROBLEMS.

    REMEDY: 1)CLEAN THE AIR MASS METER WITH A QUICK SQUIRT OF BRAKE SPRAY OR
    SIMMILAR.

    2)UNBLOCK THE SMALL BREATHE FITTING "DO NOT DRILL IT OUT" ALSO MAKE SURE THE
    THROTTLE VALVVE PLATE IS CLEAN

    3)REPLACE THE IDLE VALVE, THEY ARE ABOUT £110:00 + VAT, DONT BOTHER TO CLEAN
    IT THERE IS A DAMPING CHAMBER INSIDE WHICH HOLD SOME OIL AND YOU CAN NEVER
    GET IT ALL OUT.

    4)FIT VAUXHALL PART NO 9193502 "OIL TRAP" TO THE BREATHER PIPE AT THE FRONT
    OF THE ENGINE, YOU WILL NEED TO CUT THE BENT RUBBER HOSE BETWEEN THE CAM
    COVER AND THE METAL PIPE FIT THE TRAP WITH THE WHITE DOT FACING UP SECURE
    WITH HOSE CLIPS.

    5) HAVE YOUR IDLE SPEED ADJUTED TO 864 RPM BY YOUR DEALER, THEY USE TECH 1
    AND THE ADJUSTMENT IS TO THE ECU "NEVER ADJUST THE THROTTLE STOP"

    I HAVE SEEN ALLSORTS,THROTTLE PLATES WITH HOLES DRILLED IN THEM OR TPS
    SENSORS BUTCHERD TO CORRECT THE IDLE VOLTS ARTER THE STOP HAS BEEN WOUND IN
    ETC ETC.

    THERE IS ONLY ONE WAY TO DO IT SO DO IT PROPERLY!

    Or you could :

    Ok i've just looked under my engine, i admit i'm no expert but this is what
    I see.They have cut the big pipe that goes from the top of the engine, to
    the very big air pipe (behind the air mass meter).

    After they have cut it they have have put a platic junction box (it says
    ford on it!) inbetween the cut pipes. They then run a small new pipe (think
    it's a vacume pipe) from this to a sensor that is attached to the big pipe
    at the front of the engine. It's the one that has a open coupling on it.

    I'm getting some camera film developed, and if you want i will take a photo
    and post in on here. Click here for the picture

    Also my car was there for an MOT and they replaced some bearings in the
    rocker box (for free). Must be another vauxhall design problem.

    Jason

    Or another attempt doing this:

    I seem to have found a cure without resorting to additional plumbing - time
    will tell...

    2.Air-idle valve - remove it from the side face of the throttle body -
    careful not to damage the gasket.The valve separates into 2 halves
    (cross-head screws)- don't loose the small rubber o-ring which seals the
    join. On the motor half there is a small spring loaded piston retained by a
    fixed brass bush - if you gently push this in and out with a stout wire
    whilst spraying with ether-based carb cleaner, it is possible to wash out
    the motor body to prevent sticking. Repeat with WD40 to lubricate. The valve
    half can be cleaned simularly by spraying whilst working the plunger in and
    out against the spring. I used grease on the gasket when refitting.

    3. Small-bore emission hose from cam-cover to manifold stub - I found that
    both the hose itself and the manifold stub were blocked solid. I replaced
    the hose - use worm-drive clips in place of the spring type to make sure of
    a complete seal at both ends.

    4.Manifold stub - the bore is about the same as coat-hanger wire and must be
    completely clear - but don't enlarge it. I sharpened a coat-hanger wire bent
    at 90 degrees to gain access - the bent bit needs to be about 30mm long to
    reach right through the bore. Have a good poke from outside and inside the
    throttle barrel to remove all traces of deposit. Careful not to drop it down
    the barrel. Access to refit the hose to the stub is tight - it's easier if
    you temporarily unbolt the throttle cable bracket and move it all to one
    side.



    From Howard



    CAMSHAFT SENSOR MODIFICATION


    ECU error Code 92 is a cam shaft sensor failure.

    Eventually they admitted there is a small mod to the sensor

    itself. The mouting hole in the sensor is enlarged to allow it to

    sit closer to the switch lobes on the cam.

    Problem solved.
     
    delboy, Mar 27, 2005
    #2
  3. timetobuyafordmethinks

    me Guest


    Thanks for the post, just as i thought, the information can be found
    easy enough with an hour or so of googling.
    since cleaning the carb and meter with reddex my problems have just
    about gone.
    Cheers.
     
    me, Mar 29, 2005
    #3
  4. timetobuyafordmethinks

    The Magnum Guest

    Why dont you view his feedback and ask a few of the people who bought the
    info if they would be willing to share it with you?
    Worth a try :eek:)

    Graham
     
    The Magnum, Mar 30, 2005
    #4
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