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Explanation For rough idle? ( at the end of my rope here ) 

 

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 Post subject: Explanation For rough idle? ( at the end of my rope here )
Posted: Mon Aug 20, 2007 7:37 pm 
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ok the car is an I6 EL Fairmont ghia, i have changed plugs, leads, dizzy cap and rotor button also had injectors cleaned properly. it doesent have an aftermarket cam in it. the only thing i can think of is the timing or the lobes on the cam have worn abnormaly for some reason.

the only work its had done concerning the cam is the timing chain, gear and other parts were replaced but that was over two years ago othe than that the motor is in A1 condition. any sugestions???????

 

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Posted: Mon Aug 20, 2007 7:49 pm 
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Have you run diagnostics?

could be a vacuum leak. Check the vacuum hoses for splits and spray some carby cleaner around the intake manifold gasket and listen for a change in rpm.

 

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Posted: Mon Aug 20, 2007 11:06 pm 
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Using either a kiddies toy stethescope, or a piece of garden hose, listen for air leaks at the injectors. The o-rings are old enough now to be a bit brittle and leaky.

New o-rings from Fraud are $10ish each,(you need 12 :shock: ) so it is cheaper to go to ebay and buy a set of reco'd injectors for $105 delivered.

Cured my idle problems 8-)
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Posted: Mon Aug 20, 2007 11:14 pm 
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or you can PM me and I have a little bag of the O rings for sale

 

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Posted: Tue Aug 21, 2007 12:06 am 
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Since the injectors have been removed and installed - have the electrical connectors been fitted and clipped correctly ???

If you don't know when the fuel filter has been changed last, then a new one might be wise.

Check the base timing when checking diagnostics.

While you've got the timing light out - check each plug lead for regular pulsing.

 

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Posted: Tue Aug 21, 2007 4:10 pm 
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O2 Sensor?

 

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Posted: Tue Aug 21, 2007 7:52 pm 
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ive taken the o2 sensor out and cleaned it up, ill try running the diagnostics on it on the weekend, and ill also check the other items you guys suggested. thanx for the help and will let you know what comes up.

 

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Posted: Tue Aug 21, 2007 8:47 pm 
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I had a rough idle and it was a blown inlet manifold gasket. I was told to run the motor and spray WD40 along the join of the manifold and head. When it came to the area where air was leaking in the idle changed. I tightened the manifold bolts a little and it was all good. Then I replaced the gasket to make sure.

 

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Posted: Tue Aug 21, 2007 9:19 pm 
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wat about isc??? idle speed control.. check for alot of carbon in there take it all apart give it a good cloean with carby cleaner. see how that treats you.

 

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Posted: Tue Aug 21, 2007 10:46 pm 
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can also be a failed/ing cylinder head gasket. get it TK Tested to be sure, carbon build up behind the valves?
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Posted: Thu Aug 23, 2007 7:48 pm 
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or you could go to somewhere that sells o-rings n match them for around 2c each or go to a decent mechanic/engine reco (read:not a theiving maggot cumstain)

 

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 Post subject: rough idle
Posted: Thu Aug 23, 2007 9:17 pm 
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take it to a shop where they have a 4 gas exhaust anylizer , CO, HC, O2 & CO2 are all there to use & read if every thing else fails, of corce you start with all the basics.. (cylinder leakage test) etc.....
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Posted: Fri Aug 24, 2007 12:59 am 
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the caps in the ecu. a thread was done a while ago on it.

the go real easy, solder some new ones in and that can solve the issues.

 

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