Misfire? Transmission? Fuel Delivery?
02-02-2009, 12:58 PM
#1
Thread Starter
Join Date: May 2008
Posts: 12
Misfire? Transmission? Fuel Delivery?
I've got an '01 GT Manual, about 86k miles. I've started to notice a pretty significant misfire, but only in 5th gear.
It feels like a lurch or stall, intermittent, and only happens when under throttle in 5th gear. Even at the same speeds in 4th gear, there's nothing. I need to change the spark plugs, likely, but I somehow doubt that's the only issue at hand--since if it was purely a plug misfire, I would imagine it would be happening in other gears as well. Does this sound like a transmission issue?
It feels like a lurch or stall, intermittent, and only happens when under throttle in 5th gear. Even at the same speeds in 4th gear, there's nothing. I need to change the spark plugs, likely, but I somehow doubt that's the only issue at hand--since if it was purely a plug misfire, I would imagine it would be happening in other gears as well. Does this sound like a transmission issue?
02-02-2009, 02:38 PM
#3
Resident Ford Troll
Join Date: Jul 2006
Location: Delaware
Posts: 6,716
Sounds like a COP going bad. Misfires tend to occur during high load situations. Check for codes, and if you cant find anything, take it to a shop that can perform a cylinder "powerbalance" test, and see which cylinder is actually misfiring. Once you figure out the cylinder, replace the coil + plug and your problem is solved. Very common with Ford 4.6 + 5.4 applications..
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