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Joined: Oct 2003
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CEG\'er
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I am having problems with idle, will an o2 sensor cause that
and will it throw a code. I have already replace IAC and cleaned the MAF, I've also replace spraks with Autolites and wire, cleaned the TB. Any Help will be great.
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Joined: Jun 2003
Posts: 245
CEG\'er
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CEG\'er
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Try cleaning the Mass Air Flow (MAF) sensor. 
Col. Bill Evans CAF (ret)
98 Contour GL Zetec ATX (totally stock)
Color-Willow Mist
104,XXX Miles
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Veteran CEG\'er
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Veteran CEG\'er
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Um he just said that he had already cleaned the MAF, did you even read his entire post?
ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap
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Joined: Aug 2001
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CEG road warrior
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CEG road warrior
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o2 sensor doesn't control idle. I have had a couple disenagrate on me. 
Try replacing the throttle postition sensor. 
Last edited by LocoSCZ; 06/09/05 10:40 PM.
Hector
2003 Rally Red Mitsubishi Evolution VIII
257HP/259TQ
2005 Lapis Blue Mazda 6s
RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED
160HP/141TQ
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Joined: Jun 2004
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Hard-core CEG\'er
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Hard-core CEG\'er
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Originally posted by golgo13:
I am having problems with idle, will an o2 sensor cause that
and will it throw a code. I have already replace IAC and cleaned the MAF, I've also replace spraks with Autolites and wire, cleaned the TB. Any Help will be great.
No a bad O2 sensor will not cause bad idle. It is emissions related. One that is malfucntioning will throw a code, go to Autozone and have your car scanned for codes. To get everyone on here to help you more, what year is your car? Also, you might want to start with the basics; fuel filter change, air filter change, fluid changes, PCV and crankcase breather, etc.
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Joined: Apr 2002
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Hard-core CEG'er
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Hard-core CEG'er
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What exactly is your idle doiong?
Soem possible steps;
Check for codes 1st, easiest to do.
Check to make sure your TB closes all the way.
Make sure the idle air bypass (whole in TB) is clean.
Then I would try an oil and oil filter change, if it hasn't been done in awhile or if the oil looks black.
Then move on to PCV valve.
Frank McCoy aka Mod-deth aka Mid Life Crisis aka SVT Doood aka mcgainer is a SCAM ARTIST
Pre98 Zetec - Some Mods
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the idel is very low at a stop or parked, now if I have been driving for a while the idel stays about 500 rpm and then drops after an little while and it is a 95 gl atx, and sure i keep up with the basic like oil,oil filter..... I also have change the fuel filter
the pvc(that was work)cleaned the egr now this crankcase breather where is this, how much does it cause, oh I almost forgot no cel light no codes.
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Joined: Jun 2004
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Originally posted by golgo13:
the idel is very low at a stop or parked, now if I have been driving for a while the idel stays about 500 rpm and then drops after an little while and it is a 95 gl atx, and sure i keep up with the basic like oil,oil filter..... I also have change the fuel filter
the pvc(that was work)cleaned the egr now this crankcase breather where is this, how much does it cause, oh I almost forgot no cel light no codes.
Man you need to work on your spelling... it is like decipering chineese.... anyways, the crankcase breather is in the air filter box. Pop off the 4 things holding the box together, and seperate the halfs. While you are in there, change the air filter. The CC breather is a little foam thing, it is about $1 at any parts store.
Have you charging system tested at Autozone, to see if you alternator is putting out enough juice. Also try disconnecting the battery for a bit, and then starting the car up again, and follow the procedure for relearning the idle.
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