citadel_stang

There is black smoke running out of my '96 Mustang (straight stock, nothing special). It barely starts and needs the gas to be pumped in order for it to start. Once started, it releases black smog out of the back, along with black water. Also the engine is shaking bad causing the car to shake real bad but it gets real bad when u put it in gear. It has thrown a p300 (random misfires) code several time i replaced the coil wires and plugs. any one have any ideas what could be wrong

citadel_stang

sorry mine is a 97 mustang i messed up

Daehawk

You don't say you replaced the coil pack. Motorcraft is what to get. If thats the problem.

citadel_stang

i replaced the coil pack about a month ago when it started miss-firing and helped for a couple of days then started back up

Matt's 95 Stang

Pull your plugs and check them. Could be bad wire, bad plug, bad coil pack (I know you said it was new), or maaayyybeeee bad gas <---wild guess.

Matthew

NeoTokyo

Unless you got another motorcraft its very possible that your coil pack failed again.

Unplug the wires one by one while its running rough, when you land on one that doesnt make the engine chug worse then that is the one that is giving you problems.

Like said before, you could have bad gas or a fuel problem.
With black smoke that means its running really rich, you could have an injector stuck open.

You may notice that you oil smells really gassy and the level may even rise after driving.


The stock injector size is 14lb and spans 94-98.


Another idea, figure out which one is giving you the problem and unplug the injector plug, your black smoke should stop but the car will still idle rough of course.


Good luck, its never fun tracking these things down and trying to figure out if its fuel or fire.