Engine Miss

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Nov 12, 2014 | 03:32 AM

Cincinnati Guy

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Engine Miss

I have a 2004 f150 with 135000 miles. Bought it a few months ago. I notice after the truck is up to operating temperature it seems to have a slight miss, you can kind of feel it when sitting in the truck. Cant really hear it. Outside the truck I am hearing a ticking sound. I have changed the spark plugs on the passenger side, because that's where the ticking sound was coming from. Come to find out the last spark plug in the back was finger loose. Got them changed, on that side. Still have the miss after warmed up along with the ticking.

Few weeks fast forward I put all 8 new COP on from Ebay. Same results. I also have changed the oil and filter both with Motorcraft. Anyone have any idea where I could look? I also have a 1 year unlimited mile power-train warranty.

Nov 12, 2014 | 07:48 AM

70f100longbed

Fleet Mechanic

Joined: Aug 2002

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From: Raleigh USA

Maybe the driver's side plugs??

Nov 16, 2014 | 11:22 AM

Cincinnati Guy

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I wouldnt think its the spark plugs because when the motor is cold it runs without missing a beat, runs smooth and quiet. Once the motor warms up is when it seems to run a little rough. You can kind of hear it in the engine, but mainly you can feel it while sitting in the drivers seat. Also if you rev the engine to around 1000RPM it seems to smooth out. With a cold engine again it runs smooth at the idle speed.

Also my battery keeps going dead, charged the battery for a bit and truck starts, could it be a bad alternator making it run rough?

So what could make it run rough and have a ticking sound once warmed up?