Question about Ford Fusion
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?
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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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
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
check the injectors with a noid light you may find a bad one. if not check the compression.
Posted on Aug 03, 2012
Tips for a great answer:
Jul 23, 2014 | 2003 Ford Thunderbird
May 13, 2014 | 1998 Saturn SL
Dec 30, 2013 | 2003 Ford Focus
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.
For your trouble shooting I suggest you to refer the help
oinks below. It has step by step details for many engine misfire issues.
Click the link below:-----
Ford Explorer Cylinder Misfire?
Engine Misfire codes on Chevrolet Malibu?
Cylinder 6 Misfire?
Misfire on cylinder 4?
While stop engine idles like cylinder missing?
Ford Explorer 5.0L: Engine Miss?
Oil on spark plugs and car misfires?
Can cylinder misfire Damage the Catalytic converter?
Car misfires and error code P0306 and P0303 is shown?
Chevrolet K1500 No spark, random misfire
2004 Ford F150: Engine Misfire and Lean Code?
1995 Toyota LS: Misfire at idle or low RPM
2006 Ford Freestar: Misfire on Cylinder Number 2?
This will help.
Nov 28, 2012 | Cars & Trucks
Sep 03, 2012 | 2006 Ford Fusion
Aug 02, 2012 | Hyundai Sonata Cars & Trucks
Nov 27, 2011 | 1998 Ford Mustang
Mar 05, 2011 | 2003 Ford Mustang
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.
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.
Feb 26, 2011 | 2004 Ford Freestar
112 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: