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post #1 of 9 (permalink) Old 06-02-09, 06:39 AM Thread Starter
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2003 ford focus missing at 50mph

i have a serious engine miss at 50mph.. had coil pack replaced.. still misses. what else can i do?

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post #2 of 9 (permalink) Old 06-02-09, 06:55 PM
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Re: 2003 ford focus missing at 50mph

If you haven't had a tune up done in a while (air filter, plugs, etc) it's time to do so. I'd do this every 40K for best performance.

If the vehicle has any engine codes (light on), get them scanned to help narrow down the problem. It could even be related to a clogged injector. However, you first have to test that it's RPM, not speed related.

To do that, keep the transmission in a lower gear (2nd for example) and drive 30-35mph. RPM will be in the 2500-3500 range. If the 'miss' occurs around a certain engine speed (not road speed) then it may be a bad/faulty injector.

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post #3 of 9 (permalink) Old 06-07-09, 12:27 PM Thread Starter
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Re: 2003 ford focus missing at 50mph

Quote:
Originally Posted by 360ci View Post
If you haven't had a tune up done in a while (air filter, plugs, etc) it's time to do so. I'd do this every 40K for best performance.

If the vehicle has any engine codes (light on), get them scanned to help narrow down the problem. It could even be related to a clogged injector. However, you first have to test that it's RPM, not speed related.

To do that, keep the transmission in a lower gear (2nd for example) and drive 30-35mph. RPM will be in the 2500-3500 range. If the 'miss' occurs around a certain engine speed (not road speed) then it may be a bad/faulty injector.
did the tune up new plugs wires air filter,,, no mising at 50... but when i am in reverse.. its very sluggish.. i had tune up done by professionals
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post #4 of 9 (permalink) Old 06-10-09, 10:07 AM
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Re: 2003 ford focus missing at 50mph

Is it a manual or automatic?
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post #5 of 9 (permalink) Old 06-14-09, 07:51 AM
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Re: 2003 ford focus missing at 50mph

Have you replaced the transmission fluid at all?

'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
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post #6 of 9 (permalink) Old 11-16-09, 09:57 AM
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Re: 2003 ford focus missing at 50mph

I have a similar issue - have changed plugs, checked air intake and EGR. Some speeds and part throttle give a slight surging. I've decided it's the nature of the beast. Not about to spend too much time/money troubleshooting.

for 360ci - yes I have changed my ATF and the filter.
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post #7 of 9 (permalink) Old 11-16-09, 12:10 PM
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Re: 2003 ford focus missing at 50mph

Try cleaning the MAF with the special MAF cleaner.
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post #8 of 9 (permalink) Old 11-27-09, 08:29 AM
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Re: 2003 ford focus missing at 50mph

Most times on Focus petrol a misfire is down to the leads, which then take down the plugs and then coil pack, possibly ECU and oh also the cat as well if left long enough :-(
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post #9 of 9 (permalink) Old 11-30-09, 10:26 PM
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Re: 2003 ford focus missing at 50mph

Check the brand of wires. Had very bad luck with cheap wire sets and the same symptoms were produced, seemed worse in cool damp weather.
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