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Old 02-10-2006, 13:06   #1 (permalink)
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engine misfire

i have a 1997 ford f-150 4 wheeldrive with a 4.6 engine,
i bought the truck new ,at 50,000 it started missing real bad ,,,i took it to a garage and they did all kinds of work ,fuel flush,plentum gasket,tuneup,you name it . didnt work and cost a bundle, took it to a ford garage and he runs tests and comes up with 3cyl misfire ,,he put a sparkplug wire on it and that worked ,,,,for about 6 months,,now it started about a week ago missing bad again,,, anyone had that trouble like this,,,, im getting fed up with it ,any advice guys?
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Old 02-10-2006, 19:52   #2 (permalink)
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Re: engine misfire

Got a 99 F150 4x4 with the 4.6 with 97k mi...never had this problem...BUT my brother-in-law has a 97 F150 4 x 4 with the 5.4 that had a very similar sounding problem at about 70k mi. He said that there was a vacuum leak near the rear of the engine...some little plastic elbow went bad. He replaced it, and hasn't had that problem again...sounds like another "should have been recalled" item. I have had several problems (all Fords) over the years where I bring it into the shop, and they say...yeah, they made this wrong such and such a way...just replace it with this re-designed one, and off you go.

Check for a vacuum leak near the back of the engine, and hope you find the problem.

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Old 02-11-2006, 04:53   #3 (permalink)
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Re: engine misfire

thanks ill check again ,ive had it on numerous diagnostic reader tools and they none detect anything other than 3 cyl.back misfire .but now that you mentioned it i had a mercury villager that had a vacume leak,a little hose in back of the throttle bottle hardened and fell to pieces ,but it didnt make it miss just made the check engine light come on.
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Old 03-01-2006, 05:55   #4 (permalink)
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cyl.8 back misfire FIXED

[took it to a ford garage ,,295 bucks for wires and plugs fixed it ,,runs like new .
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