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1998 1.6 Zetec Idle Problem


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#1 oldsparky

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Posted 27 November 2010 - 10:38 AM

hi everybody
my escort has a very annoying idle problem. once it has warmed up, the idle raises & lowers constantly. this has been expertly described to me as 'hunting'. last year she failed her mot on emmisions, so i took her for diagnostics. lambda sensor, maf & air switch goosed. i replaced these & scraped her through the mot. the garage told me my trusty steed had a slight misfire & this was the cause. has anybody got any ideas because the mot is due soon & i don't want to send her to the breakers????

cheers in advance.

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#2 tommy.h

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Posted 27 November 2010 - 01:33 PM

Hi Oldsparky

try this attachment see if it helps.

tom

Attached Thumbnails

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#3 oldsparky

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Posted 27 November 2010 - 02:06 PM

Hi Oldsparky

try this attachment see if it helps.

tom

cheers tom.
apparently it could be a small vac leak. i was advised to start at the inlet manifold & work my way back. i have put on new leads & plugs but this didn't cure the problem. i even replaced the cat, just in case. think it's time to strip her down & look for bad news

anybody else got any ideas???

#4 lublin

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Posted 29 November 2010 - 06:23 PM

cheers tom.
apparently it could be a small vac leak. i was advised to start at the inlet manifold & work my way back. i have put on new leads & plugs but this didn't cure the problem. i even replaced the cat, just in case. think it's time to strip her down & look for bad news

anybody else got any ideas???

Is the engine breather pipe that is at the back of the engine kinked/collapsed where there's a 90 degree bend at the bottom? I read that this can cause idling problems.

#5 oldsparky

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Posted 30 November 2010 - 07:11 PM

on last check it looked fine.i'm going to strip her weekend & have a good old fashioned look. thanks for getting back to me buddy, i think we're going down the right path. could it be an idle valve on its way out???

#6 taffg

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Posted 30 November 2010 - 09:16 PM

on last check it looked fine.i'm going to strip her weekend & have a good old fashioned look. thanks for getting back to me buddy, i think we're going down the right path. could it be an idle valve on its way out???

hi old sparky i have had a very similar problem on a 2.0 zetec, although it was some time ago i removed the idle sensor ( mother of all jobs on 2.0) and dried it out. i seem to remember reading about moisture building up in the housing where the idle sensor locates and then when cold weather comes it forms ice and condensation when the car begins to warm up. i gave the sensor a bit of hair dryer treatment and squirted a blast of wd40 in the chamber then some solvent cleaner ( the type that air dryes out) to try and remove any moisture. didnt have a replacement 'o' ring but used vaseline to lube it and refit. if the 'o' ring is leaking air past it then you will get erratic idling and also the the host of other possible leaking hoses. anyway the problem is virtually cured on my focus once in a bue moon it reappears, i give it a good rev and it seems to clear it. hope my memory has served me right, good hunting at the weekend.

#7 oldsparky

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Posted 30 November 2010 - 11:14 PM

hi old sparky i have had a very similar problem on a 2.0 zetec, although it was some time ago i removed the idle sensor ( mother of all jobs on 2.0) and dried it out. i seem to remember reading about moisture building up in the housing where the idle sensor locates and then when cold weather comes it forms ice and condensation when the car begins to warm up. i gave the sensor a bit of hair dryer treatment and squirted a blast of wd40 in the chamber then some solvent cleaner ( the type that air dryes out) to try and remove any moisture. didnt have a replacement 'o' ring but used vaseline to lube it and refit. if the 'o' ring is leaking air past it then you will get erratic idling and also the the host of other possible leaking hoses. anyway the problem is virtually cured on my focus once in a bue moon it reappears, i give it a good rev and it seems to clear it. hope my memory has served me right, good hunting at the weekend.



#8 lublin

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Posted 01 December 2010 - 02:11 PM

"could it be an idle valve on its way out??? " could be and anyway if your going to give the car a good going over it won't hurt to start by cleaning this with a carb solvent cleaner. It's a good idea to reset the ECU by disconnecting the battery for 30 minutes after you have cleaned this out.

#9 oldsparky

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Posted 01 December 2010 - 06:23 PM

cheers boys, i'm gonna give it a go. it would have to snow though, wouldn't it! i'll keep you all posted & thanks for all the tips


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