Random misfire

[Mo Imzi]

Good morning y'all, my Foxbody is misfiring and we cannot figure out what is causing it. The spark plugs had some oil on them so I changed out the valve cover gaskets. I've also changed out the injectors, cap and rotor, wires, and the spark plugs themselves. The engine shakes, and there is also a pool of un-burnt gas left on the concrete. Any help would be much appreciated, thanks.

 

[broncojunkie]

Get the fuel leak fixed first. That may fix your problem, but at least you won't have to worry about a fire. These cars are notorious for having leaks where the fuel line connects to the rail. In fact, I have a buddy who recently got a deal on a nice fox because there was an engine fire due to this very reason. I believe the problem is that people connect the fuel line but don't get it all the way snapped in.

 

[broncojunkie]

You might also be able to tell if this is a random misfire or if it's happening on certain cylinders. While idling, check temps at the header pipes either with an ir temp gun or using a spray bottle with some water. The working cylinders should evaporate the water immediately.

 

[Mo Imzi]

You might also be able to tell if this is a random misfire or if it's happening on certain cylinders. While idling, check temps at the header pipes either with an ir temp gun or using a spray bottle with some water. The working cylinders should evaporate the water immediately.

I’ll try that, appreciate the help!