Question about Ford Fusion

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Only runs 3 cylinders

I have a 2003 Ford Fusion that misfires on cylinder 3. I have done a compression test and everything is ok. I've changed the coil pack and the ignition leads but the problem still persists?

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  • Ford Master
  • 501 Answers

If your compression is fine, and you know you have spark, then I would suspect the fuel injector is not functioning. This can be the injector or the harness. If it is not too hard to get at them, try switching two of the injectors and seeing if the misfire changes to the cylinder that you put #3 on. This way you won't buy an injector unless you need it. If the misfire is still on #3 then you have a problem with the wires controlling the injector or possibly even a problem with the controller. (note, remember to replace the bad injector not the one you put in #3 if this works. )

Posted on Mar 17, 2014

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6ya6ya
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Posted on Jan 02, 2017

mhamlin63
  • 138 Answers

SOURCE: Misfire on cylinders 2 & 3

Check that distributer cap is on straight, some times go on misaligned. Change if you have to. Also check timing, could be out a few thou.

Posted on Jun 25, 2009

  • 119 Answers

SOURCE: MISFIRING ON CYLINDER 1 VW POLO 1.4 3CYLINDER

I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.

Posted on Jul 23, 2009

roniecon
  • 6826 Answers

SOURCE: 2003 kia # 3 misfire/ runs rough

Replace the coil for number 3 cylinder.

Posted on Nov 11, 2009

  • 819 Answers

SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

bcharais
  • 278 Answers

SOURCE: 2003 Hyundai Sonata misfires. We've changed the coil packs, wires and plugs and cleaned the MAF and still get cylinder misfire.

check the injectors with a noid light you may find a bad one. if not check the compression.

Posted on Aug 03, 2012

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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:-----


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

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

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

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This will help.

Thanks.

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1 Answer

How can you fix a cylinder 3 misfire on a 2003 ford mustang


Hi hope I can help.
1.Fist change the spark plug. this is the main cause of most misfires,
2.If that don't work switch your coils. (remove one of your other coils and switch it with the #3 coil. If the misfire moves to the other cylinder then you know you have a bad coil and it need to be replaced.
3.preform a compression test.
4 Also check your fuel pressure.
Hope this helps
Please leave feed back
Thank you urnuts73@ FixYa

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2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
ACTION
Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8.

So

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