I have a used 1993 Mercury Sable 3.8 engine and it won't start it sounds like it wants to but won't I have already replace the alternator spark plugs and wires and put a new coil nothing help?

Answer 1

Sounds like you've covered the electrical system - here's a couple ideas for other things to check

Fuel - check the engine is getting sufficient gas to fire:

• Fuel filter - one of the most neglected parts - critical and easy to replace
• Fuel pressure / fuel pump - a fuel pump can partially fail in that it runs, but at lower pressure

Air / Fuel

• Look for a vacuum leak - when there's extra air sneaking into the fuel the mix and the computer doesn't know about it, the
• Air filter -
• clean throttle body

See "Related Questions" below for more

By TechToolTime

And stop buying parts, you could spend that with someone whom can diagnois the actual problem, like a blown fuel pump fuse or other very simple repair. Work smart then hard.

Answer

You've missed one component of the electrical system, the ignition module. Ford (Mercury) uses a module on the top of the engine to control spark when starting and running the engine. When this module goes bad, it might fail sporadically, or it might just fail. It is a relatively easy part to replace, but you will nedd to purchase the ignition module tool. Any of the good repair manuals will discuss how to change it.