Question about 2003 Ford Focus

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I have 2003 ford focus 2.0 SOHC SPI with a bad missfire

I have 2003 ford focus 2.0 SOHC SPI. I am not getting a service engine light and the car has a bad missfire. It idles really rough and when you put it in gear it pretty much dies every time. I have replaced the plugs, wires and coil but nothing has changed. I am running out of ideas.

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jack layton

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  • Ford Master
  • 5,308 Answers

Just to add, I always check for codes even if the light isn't on. The basics for a rough idle is to check for a leak of some kind, fuel--egr--vacuum leak. If you have a maf sensor, with engine off unplug it. then start the vehicle, see if it runs better? If so, check the maf system.

Posted on Mar 03, 2018

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Rigger DeBusk

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  • Ford Master
  • 1,811 Answers

Yup, been there, done that. Found it was a bad injector. Replaced that one injector the test showed and runs great now. Check engine light should be on though because of this problem. The test will show you which cylinder is misfiring and that is the injector you change. My test showed #5 cylinder. The last # in the code read.

Posted on Mar 03, 2018

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5 Related Answers

Anonymous

  • 49 Answers

SOURCE: 2002 Ford Focus

you will have to read the diagnostic code that the computer is sendig for the check engine light to activate

Posted on Sep 30, 2008

Anonymous

  • 43 Answers

SOURCE: 1993 Ford Explorer idles rough when engine is warm

try changing distributor cap & coil

Posted on Jan 06, 2009

Sam Shamblin

  • 54 Answers

SOURCE: 2000 ford focus code p0303 help me

The coil pack harness is the largest suspect here. i had the same cylinder and lousy running with it. I fixed mine myself but it wasn't pretty as I had to take the connector apart to do it. I believe ford has a replacement pigtail for the coil pack so if one of the smaller wires is kinked or busted off (like mine was) I'd purchase the new pigtail from them it will be easier than taking it apart yourself as I did. Regardless, my fix has held. __________________

Posted on Feb 22, 2009

Anonymous

  • 67 Answers

SOURCE: 1990 ford ranger 2.3L running rough at idle and while driving

Hi check all the fuse. fi the fuse are ok . remove the coil pack and reverce if the cly missifire change replace the coil if not chage replace the electronic comtrol module ok.

Posted on Apr 20, 2009

Bruce Hathcock

  • 3600 Answers

SOURCE: 2001 ford escort, rough idle, runs smooth while

Your IAC may be defective, first check the canister purge valve by removing the large hose off the charcoal canster and plugging the hose with a bolt or something you can fit into it, then try it also check PCV valve and see if it's bad. there are more things to check like fuel filter fuel pump and or fuel strainer if fuel tank but would need to have more information to help.

Posted on Aug 28, 2009

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Made a video on how to change the AC Compressor, Accumulator, Orifice Tube, and Hose Assembly on my 2003 Ford Focus 2.0L SOHC SPI. Symptoms started off as blowing hot air at idle and then it just blew hot air all the time and Firestone told me it had not compression and needed the compressor replaced. I got all my parts at AutoZone for a around $230. Save 20 On Online Ship To Home Orders Of 100 Or More
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I have a ford focus 2003 model.plugs number 2 and 3 are missfiring.is there posibbility that the Ecu has packed?


Check the connection to your coil pack for a corded or broken wire going into the connector. The coil pack is where the plug wires come from. Ford has a pigtail kit to replace it if it is bad. Or the coil pack is bad. Top, driver side of engine.

Only 1 in 10,000 PCMs is defective.

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lol, I never knew they made a sohc focus, 99% of these are zetecs DOHC. so they have the spark plugs down the middle of the cyliderhead.

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FORD FOCUS BELT DIAGRAM


plese rate

what engine?

2.0L SPI w/o a/c
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2.0L SPI w/ a/c
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2.0L ZETEC
790bdbc.gif
ZETEC W/O A/C
5bed3e0.gif

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Crankcase capacity for 2003 ford focus 2.0 liter split port engine


Hi,

To my knowledge, a 2003 Ford Focus 2.0 SPi engine would need 4 quarts of engine oil (roughly 3.78 liters). Incidentally, the Ford/Cosworth Zeta/Zetec engine would be needing 4.25 quarts (~4 liters).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 02, 2008 | 2003 Ford Focus

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