Rough idle 4.7 v8
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Mountain Pass
Joined: Sep 2009
Posts: 151
Likes: 0
From: Roseville, MI.
Rough idle 4.7 v8
Hello all,
So my '04 f150 stx 2wd 4.6 v8 is running a little rough at idle, noticeable every few revolutions of the engine. Extra noticable with foot on brake and able to feel vibration from engine through pedal. No dash lights or codes present.
Recently asked my regular mechanic to take a look, and he said the cannot pinpoint which spark plug/coil it is un until it gets worse, and throws a code.
What's your thoughts on narrowing this down faster? Thanks
Oh, and the truck is grey if that helps ���� ( I know it doesn't, , haha)
So my '04 f150 stx 2wd 4.6 v8 is running a little rough at idle, noticeable every few revolutions of the engine. Extra noticable with foot on brake and able to feel vibration from engine through pedal. No dash lights or codes present.
Recently asked my regular mechanic to take a look, and he said the cannot pinpoint which spark plug/coil it is un until it gets worse, and throws a code.
What's your thoughts on narrowing this down faster? Thanks
Oh, and the truck is grey if that helps ���� ( I know it doesn't, , haha)
Last edited by RustyGreen; Aug 6, 2019 at 07:29 PM. Reason: Incorrect spec
FTE Chapter Leader
Joined: Feb 2004
Posts: 14,904
Likes: 76
From: Wayland, MI
The auto enginuity software should be able to pin point. You may be able to have it running and unplug each coil pack while idling and see if it gets worse or stays the same. When is the last time the plugs and boots were changed? It could even just be a cracked boot causing an arch and miss fire.
I know Bender chased it on his truck for a while.
Another way would be to purchase one coil and swap it around unitl it smooths out, but I would also pull and replace all the plugs.
I know Bender chased it on his truck for a while.
Another way would be to purchase one coil and swap it around unitl it smooths out, but I would also pull and replace all the plugs.
FTE Remembers
Joined: Apr 2003
Posts: 14,988
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From: Savannah, GA
Lead Driver
Joined: Feb 2011
Posts: 6,676
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From: Milford, MI
I found 8 coil packs on Amazon when my wife had the mountaineer and replaced them all, and everything smoothed out. I thought $35 for 8 coil packs meant that they were all going to fail in a week, but they lasted two years until she sold it. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Thread Starter
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Mountain Pass
Joined: Sep 2009
Posts: 151
Likes: 0
From: Roseville, MI.
I have not made any progress on this engine miss , toyman. I have been considering getting a second mechanics to scan it before I drop the money they want.
But havent had the time.
But havent had the time.
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