Question about 2002 Ford Taurus

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REF: Code P0303

My vehicle has registered code P0303. It idles rough and occasionally misses while driving. What are some things I could check?

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  • robertwcolwe Feb 25, 2009

    Idles fine, but under light to mild driving it starts to sputter. Then today, engine light came on, and it really started to miss. I ran fuel treatment through the booster a few weeks back, and it cleared right up. Now its worse?

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Code means misfire on cylinder 3 check plug lead spark plug and if needed remove the tappet cover to check the valves

Posted on May 26, 2008

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Misfiring


code p0303 refers to cyl 3 misfire detected ===causes engine mechanical fault--wiring--ignition/fuel system--injector--ECT/MAF sensor--ECM
code p0316 refers to misfire detected during start up --first 1000 revs===causes --engine mechanical fault--wiring--ignition/furl system--injector
the common fault cause is ignition/ fuel system and injectors so I would be checking fuel pressure and injector systems for clean and wiring connections are good especially on no 3 injector.

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that code is not a sensor code that is a missfire code , you have a miss fire in cylinder number 3 , check you spark plugs or coil for that cylinder , with that code car will run rough ( shaking ) and some time the car wont even start in small engine . let me know hosw it gos

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P0303 cylinder misfire


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- OBD-II Trouble Code P0300? http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
---------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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Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.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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Engine Misfire codes for car?

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

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

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.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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This will help.

Thanks.

Jan 23, 2012 | 1999 Subaru Legacy

1 Answer

Dear sirs...HELP!!!! ok we had issue w/ code P0303 and replaced plugs & wires...ran better when started up until I got ready to drive around block to test drive...idle seemed little rough when in park...


p0303 is cylinder 3 misfire. Check that plug, boot and coil. . You can move this coil and boot to another cylinder to see if the code changes. If it does, you have a bad coil or boot. Its most likely the spark plug boot on cyl 3.

May 02, 2011 | Ford Taurus Cars & Trucks

1 Answer

We have a 2001 ford windstar with a 3.8, it started running rough and then the check engine light started flashing, we stopped driving it, pulled the codes and it was a p0303, we replaced the spark plug...


It's common for ignition coils to go on these vehicles. If you have a spark tester (auto parts store) install it on your #3 plug wire and check for a strong spark. By swapping the wire you obviously eliminated it as a possibility. There's always a chance that you have a compression problem or ad injector problem but chances are it's just a bad ignition coil. Mark the wires then remove them. You can remove the coil without accessing major components but it will be tight. Disconnect the connector and remove the bolts.

If not, look at the coil for hairline cracks. I see a lot of coils go bad and the vehicle will run worse when it's damp or raining out. Good luck!

Apr 18, 2011 | Ford Windstar Cars & Trucks

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P0302 #2 cylinder miss fire code. Replaced plugs and wires but at 40 mph runs very rough. Idles smoothly but not when put in gear.


I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

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Check engine light on running very rough


go to autozone for a free computer scan and get the fault code. Possibly one of the COPS, Coil on Plug. COde will tell you

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3 Answers

2001 v6 escape rough idle when cold


To update my earlier repair on the 2001 6 cyl Escape: When cold, and when the ignition was turned over but no accelerator pressure given, the rough idle finally returned the P0303 code again when the check engine light came on indicating that it wasn't caused by the plugs or the coil. FYI, I had replaced the intake manifold gaskets during the original repair and just prior to that I had replaced the fuel filter which was very dirty (I cut it open to see).

The repair manual referred to fuel injectors as a possible problem. I have run three tanks of fuel using different injector cleaning products and am very pleased with the results. Cold starts are much smoother and I am unable to coax out the P0303 code or any other code.

My opinion, change the fuel filter, use a fuel injector cleaner for a couple of tanks, change the plugs if the problem still exists. The coils were not the problem on my vehicle.

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