2001 Ford Mustang Missfire

THOMAS E. SAKOWYCH

MEMBER
2001 FORD MUSTANG
6 CYL
2WD
AUTOMATIC
118,850 MILES

Had the engine completely die as a tried to accelerate. The service engine light appeared. Taking it to a ford dealership they ran the on board diagnostics and determined the fuel pump was the problem. It also show the engine had tripped an oveheat situation. I never seen the temp gauge reach top dead center.

The fuel pump was replaced. The problem remained. I took it back and they diagnosed a slight missfire on cyl. #3. They moved plug 3 to 1 and vice versa. The plugs installed are oem autolite - exactly what came with the vehicle. They were installed at 69k miles. It now has 118,850 miles, or approximately 49k miles on them. The Ford dealership suspects plugs or the coil stressing an electrical problem.

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Misfire at no.3 should lead to checking the sparkplug, compression and injector for that cylinder

Engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

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Friday, August 21st, 2009 AT 2:01 AM

THOMAS E. SAKOWYCH

MEMBER
2 POSTS

Injectors were cleaned at 30k, 69k and 94k. Every oil change I add a FI cleaner such as proguard by Chevron.

Could there be carbon fouling in the DIS cap? It is factory original.

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Friday, August 21st, 2009 AT 2:11 AM

RASMATAZ

MECHANIC
75,992 POSTS

Is this a distributor ignition system? If so open it up and inspect, Did you check no.3 compression. You need to check every item I've mentioned every step of the way. Also could consider changing plugs due to the mileage

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Friday, August 21st, 2009 AT 3:00 AM

MJR346

MECHANIC
132 POSTS

Its' distributorless. And my guess is to look for a bad plug wire or a coil pack going out. The coil packs are a known issue for me.

The plugs however aren't OEM. Ford has been using it's own brand called Motorcraft since the 1970s but unsure who's building them currently

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Monday, August 24th, 2009 AT 9:19 PM