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Topic: Engine judders (Read 373 times) |
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JG2
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Posts: 677
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Engine judders
« on: Mar 10th, 2007, 4:30pm » |
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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
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RichardMS
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More mods coming soon !
Posts: 434
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Re: Engine judders
« Reply #1 on: Mar 10th, 2007, 4:37pm » |
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Air leak perhaps 
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Engine judders
« Reply #2 on: Mar 10th, 2007, 4:37pm » |
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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
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JG2
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Posts: 677
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Re: Engine judders
« Reply #3 on: Mar 10th, 2007, 4:41pm » |
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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 ??
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tintin
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I'm a YaBB newbie!
Posts: 592
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Re: Engine judders
« Reply #4 on: Mar 10th, 2007, 6:17pm » |
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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 
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'95 Cosworth Ultima
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JG2
Full Member
Posts: 677
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Re: Engine judders
« Reply #5 on: Mar 10th, 2007, 6:57pm » |
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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
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Engine judders
« Reply #6 on: Mar 12th, 2007, 12:15am » |
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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 
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JG2
Full Member
Posts: 677
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Re: Engine judders
« Reply #7 on: Mar 12th, 2007, 8:25am » |
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Ok will try another solenoid ..tks
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