Question about 2000 Ford Taurus

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My 2000 taurus keeps showing a #3 misfire code P0303. I have changed plugs, wires, checked the injector etc. Clear the code and for the most part it runs fine for a week or ? then light comes on again and poor idle when cold. Found vaccum leak and fixed that? Any more suggestions. Also gives a code of 1635? Cant find that code # Thanks

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  • Anonymous Aug 09, 2008

    I think the the codes' number refers to the number assigned to the coil packs' number not the cylinder numbers. I have the duratech coil goes 465 not like cylinders 123 I had codes for 3 and 4, changed plugs and

    321 456 wires,runs fine now

  • Anonymous Mar 09, 2009

    2003 Taurus has Diagnostic code P0303



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I had the same problem on my '02 Taurus, 3.0, V-6, 24 Valve engine. I replaced the plugs and plug wires which helped the problem but did not cure it. I then replaced the ignition coil (Motorcraft part # DG-485) which solved the problem. Has been running great since then...

Posted on Mar 30, 2009


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2008 Cadillac CTS returning P0303 after replacing spark plug and coil pack

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Code p0303

P0303--"Cylinder 3 Misfire Detected". The PCM detected a misfire on cylinder 3,most likely an ignition issue.If your engine has one coil per cylinder,see if you can swap the coils(don't forget to mark the suspect coil).You will have to clear the existing code(the PCM will usually disable the fuel injector on the dead cylinder).See if a different code now sets(P0301 is cyl 1,p0302 is cyl 2,etc).If the code is the same,you will want to look at the plug(and wire,if your engine has plug wires).You could swap the wire and plug (one at a time) to see if the code changes with any of these.Of course,this is easier if you have your own code sanner(you can get a basic one for under 50 bucks-that's all I have,and it gets the job done!) If none of the parts swapping finds the solution,you can do similar swaps on the fuel injectors,but it is a little more work than the ignition stuff.

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Astro van MIL light is on. The code is P0303.

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I would change out all the plugs at the same time, clear the light and see if it comes back. If it does then change all the plug wires, distributor cap and rotor (if it has them).

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That is a cylinder misfire code have you had the plugs changed, could be a bad plug maybe bad coil, or injector how does it run

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You are mis fireing on cyl 1 and 3 if you replaced plugs and wires and coil this is going to be a fuel injector issue or valve issue. See if you can swap the injectors with known good cyl. and see if it changes. Or have a shop do a fuel injector service on it to see if it helps. It may be to late for the fuel injector service.

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po303 is misfire on number 3 cylinder. It could be a bad spark plug or wire, maybe a loose plug wire, could be alot of things. injector problem drop of water in fuel that happened to hit that cylinder. but most likely a plug misfired. I would clear the code and see if it happens again. If so give care a tune up.

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