I have a 1994 Lincoln Mark 8 , the brake pedal started going all the way to the floor, I replaced the master cylinder and that didn't fix the problem so I replaced the brake booster but I don't know if that fixed it or not because now the car won't start and allow me to get vacuum to the power booster. While under the dash in an effort to make more room to work the computer was unplugged for approximately 30 minutes and then plugged right back in. Would this be some or all of the reason why it won
t start? I didn't find anything that looked like it was accidentally disconnected or damaged but you never know. I don't have a clue what to do with it at this point. Thanks
You need to go back to basics. First check to see if you have spark at the spark plugs. If you don't have spark at the plugs, locate the problem and repair as necessary.
Check to see if you have fuel pressure. If you have fuel pressure; check to see if you have an injector pulse at the fuel injector. You can check this with a noid light.
Does the engine start and stall or is it a no start condition?
Check to see if the spark plugs are fouled with fuel. This could indicate a no spark condition.
If you can get a scanner or code reader, check to see if any codes are stored in the computer memory. Repair any codes that may come up.
The brakes should be bleed thoroughly to make sure no air is in the system.
Check the adjustments on the rear brake caliper or drum brakes what ever was in stalled on your vehicle.
If all of this is confusing for you then your local mechanic is the one to check this out. The mechanic has the proper testing tools to find the problem in both areas, your brakes and no start condition.
I tried using a scan tool but the problem is that OBD 1 scan on this vehicle runs the car through several tests which require starting the engine and warming it up to normal operating temp. Like you said, this may be a job for a certified mechanic. I really appreciate you taking the time to answer my questions, thank you very much.