1994 Lincoln Mark VIII Engine

Tiny
MARKVIII
  • MEMBER
  • 1994 LINCOLN MARK VIII
  • 4.6L
  • V8
  • RWD
  • AUTOMATIC
  • 175,000 MILES
My 1994 lincoln Mark viii is having some engine trouble. The car starts and will drive, but when the rpms get low, or when it idles, the engine starts to shake and shuts itself off. I think somethings wrong with the crankshaft, someone told me it could be the crankshaft sensor. I checked it and it looked to be in working order but I couldn't test it. Any ideas?
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Friday, January 10th, 2014 AT 8:01 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
Forget the crankshaft and sensor. A problem with the crankshaft is really serious. You'd have lots of noise and low oil pressure. That won't last long before the engine seizes up. The engine won't run with a defective crankshaft position sensor.

A vibrating engine is due to a misfire. That can be due to worn spark plugs and wires, or less commonly it is due to a fuel supply problem. Start with the basics. Replace the spark plugs and wires if they haven't been changed in a while. If the problem persists, the next step is to determine if the engine is running rough because it is running too slowly, or if it's running too slowly because of a misfire. The Engine Computer will bring engine speed back up to the desired speed when there's a misfire, but it has a limited ability to do that.
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Friday, January 10th, 2014 AT 9:12 PM
Tiny
MARKVIII
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Is it the same case even though when the car is higher then 2000rpm it runs and sounds the way it should?
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Friday, January 10th, 2014 AT 9:23 PM
Tiny
CARADIODOC
  • EXPERT
Misfires are easy to feel at low speeds because there is such a long time between power pulses when the misfire occurs. At higher speeds there is so little time elapsed during the misfire that it is hard to notice.
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Saturday, January 11th, 2014 AT 12:08 AM

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