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Old 12-25-2012, 02:25 PM   #1
sproctor
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Engine starts hard

Hello,
I recently purchased a 2005 Ford Focus ZX4, with aftermarket air intake and muffler. The car runs good for the most part, pretty peppy, has 155000 miles. The person I purchased it from claimed 38mpg, I thought that was excessive (the rated is 28-31) and I figured if I got 30 I would be a happy camper. However since the day I purchased it, I've only gotten like 24!!! So I replaced the spark plugs, and fuel filter, but it didn't help at all. Being winter I attribute part of the problem to colder weather, but 24mpg? And that's interstate driving it very carefully! The spark plugs I put in were special super spark performance plugs that claim to increase the mileage (I did gap them properly). The car runs really great except starting. If its cold it takes 5-10 seconds of cranking to start, if its warm, 3-5 seconds. Once the engine starts, the RPMs will rev up to about 2200 then down to about 1000-1200 RPMs and then back up and it will do this about 5-10 times, my foots not on the gas, it will just go up and then down and then up about 5 or so cycles before it just idles. It's pretty smooth but I find that strange. It's been suggested it may have a fuel leak, and I suspect perhaps the fuel pump maybe going out. Any suggestions what to check before I take it into a mechanic? Any suggestions as to the problem with low MPG?


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Old 12-25-2012, 02:36 PM   #2
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They take in a lot of air during every other start up, when it happens turn off the key and try again, this happens pretty frequently on mine too but it runs fine.
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Old 12-28-2012, 06:20 AM   #3
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dont think you have a fuel leak. never recommend putting in those aftermarket plugs, go with the motorcraft ones, ive seen to may issues out of the other ones. do you have a check engine light on?
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Old 12-29-2012, 01:28 AM   #4
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'They take in a lot of air during every other start up, when it happens turn off the key and try again, this happens pretty frequently on mine too but it runs fine.'

You gotta be kidding...........they teach that in school up there?

To OP, junk the super trick plugs and get your codes read, that may push you in a direction.
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