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Old 04-26-2005, 02:45 PM   #1
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3100 rpm misfire

once again, i need your help boys.

2002 svt, no mods, no nothing, seems to have a stutter or misfire between 2900 and 3100 rpm's. just thought i would post up here before i went poking around in there.

by the way, i used to run those 4 prong platinum plugs in my racing miata. loved em. anyone use em for the focus?

quick plug also, performance autosport in escondido is my new mechanic. rob comes from a mustang/ hot rod background, but is an authorized svt wrench, knows his way around a hot hatch, and is a helluva nice guy to boot.


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Old 04-26-2005, 03:02 PM   #2
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any codes being thrown? if there is a repeated misfire, it should throw a code

haven't changed plugs, but will be denso's the next set I buy.
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Old 04-26-2005, 03:38 PM   #3
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codes being thrown in? what the hell does that mean?
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Old 04-26-2005, 03:46 PM   #4
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Take it to autozone or advanced auto parts (or other big name auto store) and they will pull the codes for you. Codes tell what is wrong or what is happening with the motor. If your check engine light did not come on or stay on there will not be a code stored. How long have you had the focus svt? If this just started happening then it could mean something is wrong but if it has always been there than it is probably the mid rev stumble that everyone with an svt has. That is one reaseon why tunes for the svt is so popular right now is because they almost eliminate the stumble between 3K to 4K from the svt. That is also why svt has released an update to the stock flash for the 02 and 03's. They are going to be releasing (if it is not out now) a new flash for the 04's so the stumble is a common problem in all svt's. Any ways, if it is slight and has always happened the stumble is what it is but if it is harsh and new they you may have a problem which could be about 100 diffrent things (more like 10-20 diffrent things).

Is it new?
Is it harsh?
Have you had the ecu flashed with the update?
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Old 04-26-2005, 04:48 PM   #5
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The first thing I would do it check the wires thourougly and pull the plugs and check them out. As far as the Bosch quad platinums (I think that's what their called) go, I think that is the plug I will go with when my current plugs need changing, I have heard they are pretty good.
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Old 04-26-2005, 05:43 PM   #6
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Don't forget the headlight fluid and muffler bearings.
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Old 04-26-2005, 05:45 PM   #7
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thanks I keep forgeting those damn muffler bearing need greased once every 100 years
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Old 04-26-2005, 06:18 PM   #8
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those bosch plugs are junk. they aren't gapped right no matter what car you have, and the extra electrodes impede flame travel, consequently decereasing horsepower. get nkg iridiums, or denso iridiums.
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Old 04-26-2005, 06:45 PM   #9
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I wasn't going to say anything but I also read somewhere that the multi electrodes don't do crap and your better off just buying a normal plug (sorry don't remember where I read that, maybe consumer reports). I have the denso irridiums in my car and they are the only spark plug I have used (and I've used many) that gives you a immediate diffrence. I recomend them, yet they are a little pricey.
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Old 04-26-2005, 06:52 PM   #10
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hahaha headlight greese...if thats a joke i liked it, if its real what the hell?
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