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Ford au 99 model 6 cylinder is missing when idling but runs ok when driving, has new spark plugs and fuel filter

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Check plug wire resistance (continuity) and cap and rotor contacts (if applicable) before proceding with further diagnostics

Posted on Sep 09, 2010

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RE: Johnny brown- 2003 Sebring multiple cylinder misfire 3.0 New distributor new crankshaft sensor new plugs new wires good compression injectors good... Installed new EGR started with cold engine and


ENGINE MISFIRE

There are few possibilities that can cause engine misfire issues. It can be issue with spark plugs or faulty spark plugs. Also get the compression test done for cylinders. If any of cylinder shows low compression then required, then that particular cylinder will cause misfire.

Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----


Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Cylinder 6 Misfire?

http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Ford Explorer 5.0L: Engine Miss?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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Car misfires and error code P0306 and P0303 is shown?

http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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Chevrolet K1500 No spark, random misfire

http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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2004 Ford F150: Engine Misfire and Lean Code?

http://whatisbyme.blogspot.in/2012/05/2004-ford-f150-engine-misfire-and-lean.html

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1995 Toyota LS: Misfire at idle or low RPM

http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Toyota Corolla: Random Misfire?

http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html

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2006 Ford Freestar: Misfire on Cylinder Number 2?

http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html

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This will help.

Thanks.

Dec 09, 2012 | Cars & Trucks

1 Answer

99 mpv missfires,splutters.wont idle & has no power. when MAF is disconnected runs a lot better. I replaced the Maf but still does the same.The problem started suddenly,drove to work ok but when i


replace fuel filter, clean fuel injectors.could have bad fuel, do a code scan before buying new parts.faulty egr valve or faulty engine coolant temperature sensor cause engine run poorly.replace spark plugs and wires because if spark plug wires is bad or spark plug and ignition coil is bad that will cause rough idling misfiring and stalling you have dead cylinder not firing properly..

Oct 01, 2012 | Cars & Trucks

1 Answer

1996 ford full size bronco, 302 engine, starts and runs fine, under power it bucks and misses and has no power. let off gas and is ok again. A test shows a misfire on the #4 cylinder. The plugs, wires and...


Is this a 4.9L engine? An inline 6? My database doesn't show a 4.9L in that model year. It does show that engine in 95.
Did you visually check for spark at number 4 cylinder?
For 95-- 4.9L--fuel pressure--50--60 psi. Use a gage and check proper fuel pressure. Also, see if fuel pressure will hold for a bit with everything off.
Fuel--spark--compression. Some ford makes and models, ford can disable the fuel injector, if misfire is detected. I only mention this because, swapping injectors may not be conclusive? You can check for fuel injector pulse, anyway.
How long since over-all tune-up? You did get a new fuel filter, if inline filter, correct?

Jul 28, 2017 | 1996 Ford Bronco

1 Answer

I took my 2004 gmc envoy, 6 cylinder, in for new spark plugs and fuel filter. When i got it back the service engine light came on. I took it back and was told that it was a bad spark plug. I have taken...


I was having a similar problem with my 2002 Envoy. Usually when accelerating at 60 and 90km/h it would have almost like a clunk and idled rough.

I took it into the shop and they said a tune up would be the first step to correct the misfire (25 options to choose from!) After pulling the spark plugs the 5th and 6th didn't look right. As a result my mechanic ran a compression test.

The 6th cylinder is only putting out 80lbs of pressure where as the rest were putting out 195lbs (factory says it should be around 215lbs). His recomendation was new motor or new vehicle.

Jan 07, 2011 | GMC Envoy Cars & Trucks

1 Answer

It has a300 6. It is sputtering while idling and somtimes misses while driving. What can I look at???


bad spark plug wires, distributer cap, distributor rotor, spark plugs, fuel filter...various things

Apr 16, 2010 | 1989 Ford F 150

2 Answers

Ford F150 engine backfiring, running/idling rough


I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Apr 16, 2010 | Ford F-150 Cars & Trucks

1 Answer

Same issue with the rough idle with a warm engine 4.0 Ranger


i would think a plugged fuel injector on # 6 cylinder could be the problem,or a big vacuum leak at that cylinder
a valve burnt/stuck could be but you dont see much of that anymore
could be coolant leaking into cylinder from leaky haed gasket but you would have to add coolant every so often
i would check #6 cyl. spark plug after driveing around a while if it looks new, ie no deposits on it then an injector would be what i would change next

Mar 20, 2010 | 2004 Ford Ranger

4 Answers

I have a ford explorer 99 but it's giving a error code PO306 what do u think it is


It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.

Feb 17, 2010 | 1999 Ford Explorer

1 Answer

Honda Misses.


Pin point the dead hole and check that injector.

Dec 23, 2008 | 1995 Honda Accord

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