HELP! What could be causing this?

Mustang, Taurus, Tempo and Cougar. Town Car, Mercury and Escort.
Ask our auto mechanics for help to all your Ford car questions.
Post Reply New Topic
Tabc
Posts: 4
Joined: Fri May 17, 2013 7:34 pm

HELP! What could be causing this?

Unread post by Tabc » Fri May 17, 2013 7:56 pm

I have a 1996 ford thunderbird lx. 4.6 engine. When I start my car the engine runs fine but as soon as the engine is warm and I put the car in drive it dies right away even when put in reverse. I have replaced coils spark plugs wires. When computer is hooked up it reads cylinder 3 misfire. What could be causing this?

 

User avatar
ProTech
Posts: 657
Joined: Wed Oct 17, 2012 10:08 am

Re: HELP! What could be causing this?

Unread post by ProTech » Fri May 17, 2013 8:52 pm

If the ignition components are good and functioning properly, that only leaves two things that can cause a misfire on that cylinder. The first would be a bad fuel injector, which is probably the most likely if you're sure the ignition parts are working good. The second would be a mechanical problem inside the engine, such as low compression due to broken or worn parts in the cylinder head or piston area. If cylinder 3 is a 'dead hole', meaning that it misfires constantly under all engine loads, then would either have an injector that is stuck/failed....or....a valvetrain/cylinder head/mechanical issue. Either of these would require some extensive checking and testing.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+

Post Reply New Topic