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Old 06-06-2011, 09:14 PM   #1
jezzowhat
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2002 Zetec engine miss - help

Hi,
My name is Teresa and I am new to the forum and am hoping someone can help me. I have a 2002 Ford Focus that has randomly had an engine miss at all speeds which is progressively getting worse. It used to come and go but the engine is doing it constantly for the last couple of days. The spark plugs have been changed yesterday but did not help. I am not sure what to check next, the alternator is putting out 15v to the battery. The wierdest thing is if I push the OD button [auto trans] the engine missfire goes away almost completely but the car still has no power. The engine is a Zetec 16 valve.Any help would be appreciated.
Thanx in advance.


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Old 06-06-2011, 10:05 PM   #2
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Hi!...Welcome to the forum. I"ll bet you just need to finish the job. Are those the original spark plug wires?

1.) replace spark plug wires and boots

2.) Inspect the wires going to the coil itself. They can fray or be damaged. Its common

3.) if after these 2, do the fuel filter as well, if its been more than 30K miles...

BUT, I"ll betcha its the spark plug wires.
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Old 06-06-2011, 10:08 PM   #3
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If the plugs are correctly gapped and the spark plug wire boots snug, work backwards from the plug. (btw, examining the plugs when they were replaced may have given you a clue as to which cylinder was misfiring, if it was only one.) Check plug wires (chafing), coil itself (for cracked plastic insulation), coil electrical connector (for broken/loose wires).

Edit: viney266 beat me to it.
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Old 06-06-2011, 11:37 PM   #4
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Did someone install the dreaded evil Bosch spark plugs?
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Old 06-07-2011, 01:25 AM   #5
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Check if all plugs are firing.

Start your motor.

One by one, starting from plug #1, pop the wire off the plug.

A difference in the motor idle = good.

No difference = no spark.

Inspect the plug with no difference. Sand it, re-gap it, replace.

Check to see if it's sparking now.

If not, inspect the wire up to the distributer.

Just follow the plug wires around, inspect for shorts.

Good luck.
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Old 06-07-2011, 06:04 PM   #6
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Thanx for the tips, I will try them this weekend. Why would the OD button have anything to do with this - the engine miss goes away when it is pressed? Computer or tranny sensor problem?
Thanx again
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Old 06-08-2011, 02:19 AM   #7
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If its not shifting into O/D, it means the motor runs at a higher RPM while driving... misfires happen more at low RPMs.
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Old 06-08-2011, 11:58 AM   #8
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Is it ok for the first few min. when you start it?, if so, i would think fuel filter;;;;;;either way,if the filter has not been changed, change it.
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Old 06-08-2011, 01:23 PM   #9
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Hi, the engine misses right at startup, just sitting and idling but it smooths out when the OD button is pushed.
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Old 06-08-2011, 02:03 PM   #10
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is it showing check engine lite?
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