Question about 2003 Ford Focus

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After replacing spark plugs motor idles or seems out of timing

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  • Alex Aug 02, 2013

    I did switch the 1 to the 4 and 4 to 1 and it worked. Thanks alot for the answer

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Check to see if you put spark plug wires on correct plugs . If fireing order is correct check for a cracked or miss gapped spark plug

Posted on Aug 02, 2013

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Hesitation


I had the same symptoms. First off, how long since you have replaced the spark plugs and wires? I know they are supposed to be 100,000 mile life but not in my case. Here is what I did to correct my issue (note: it did not do it all the time, only occasionally and seemed worse when it is cool in the mornings)
1. Replaced Spark plugs, the issue got better but did not go away.
2. Took throttle body off of truck and cleaned all the carbon from around the buttefly with toothbrush and carb cleaner. Took idle control module out as well and cleaned carbon as well, issue got even better but did not go away.
3. Replaced GM spark plug wires, only 55,000 miles on them, one at a time (just to determine which one was causing the issue if it was a plug wire). Cylinder number 6 wire was bad. So, replaced plug wires and wa-lah, problem solved. Not saying that is your issue, but it corrected mine.
4. While I was at it, I replaced O2 sensors b/c I did have one that was lazy according to the computer.
Truck now has 231,000 + miles and runs like a champ.

Aug 26, 2008 | 1999 Chevrolet Silverado 1500

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