Ford Scorpio Forum - Print Page


    
      
        Ford Scorpio Forum
        (https://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl)
      

        General >> Problems >> Engine judders
        
(Message started by: pedropedro on Mar 10^th, 2007, 4:30pm)

Title: Engine judders
Post by pedropedro on Mar 10^th, 2007, 4:30pm

Hi ..ive got a 2.3 16v which idles pretty well for about 10 secs

then there is a noteable/ decided lurch in the engine and the idling becomes rough...what times in after foot off the pedal in ten seconds?? assume something in engine mamangement

happens in drive or neutral......cleaned icv / maf

any ideas really annoying revs all over the place ie 600-800

tks

Title: Re: Engine judders
Post by RichardMS on Mar 10^th, 2007, 4:37pm

Air leak perhaps :-/

Title: Re: Engine judders
Post by scorpio_man on Mar 10^th, 2007, 4:37pm

hi there

could be the a/c kicking in. if your compressor is siezing a bit, then this will pull the revs down.

have a look at it (r/h/s of engine). watch it switch on and off. see if the revs fall and rise evenly.

also give the idle by pass valve a clean out. clean both 'holes' with carb cleaner and then work the 'ram' between the holes with a flat screwdriver. be gentle with it, though. once everything is clean, drop a couple of drops of 3 in 1 oil on the ram. make sure there's no air leak when you put it back on.

hth

Title: Re: Engine judders
Post by pedropedro on Mar 10^th, 2007, 4:41pm

No a/c is off ...its a predictable time in almost exactly 10 secs sitting in drive or in neutral whatever ...runs smooth as can be then clunk you can almost hear a solenoid closing,,,,but ist not the a/c compressor...checked everywhere for air leaks but could have missed soemthing

the time in thing is the clue i guess what is it that times in ??

Title: Re: Engine judders
Post by tintin on Mar 10^th, 2007, 6:17pm

have you had the iacv off? i had similar symptoms, garage had put the valve back on back-to-front, as soon as you rev it, the revs held high for 10 seconds, then dropped back down. i presume the ecu tries to control it, then gives up and returns to factory defaults or something ??? anyway, thanks to Highlander, its back on the right way round and now idle is dead on 850rpm all times ;D

Title: Re: Engine judders
Post by pedropedro on Mar 10^th, 2007, 6:57pm

just taken off again to clean again...didnt think it could be round wrong way!!

mine has plug connector nearest front of car which is way it should ..thanks for suggestion though

Title: Re: Engine judders
Post by jonnycab on Mar 12^th, 2007, 12:15am

Even though the IACV valve, spring & spindle may look as they are working okay....

....It's the solenoid that makes the mechanical bits work.......If the solenoid is faulty, then the valve won't work properly ;)

Title: Re: Engine judders
Post by pedropedro on Mar 12^th, 2007, 8:25am

Ok will try another solenoid ..tks