Intermittent start with no spark

Tiny
HOTREDLINCOLN
  • MEMBER
  • 1996 LINCOLN MARK VIII
  • 138,000 MILES
Battery is good. Starter is good. Fuel pump is kicking. Over, but no fire. Starts occasionally thinking it might be Anti-Theft?
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Sunday, July 28th, 2019 AT 5:19 PM

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Tiny
MOTOR MASTER
  • EXPERT
Hello my name is Dave.

If it's a security system problem the anti theft light will remain lit when you are trying to start it. If not first thing I would check is if you have power to the coil packs and if it has a signal. You can check both with a standard test light, checking the power side with the test light grounded and the signal side with the test light ground lead connected to the positive side of the battery then having someone turn the engine over and the light will flash if you have a signal. Each coil pack has 3 wires, the center is power and the 2 outer ones are the signals. I doubt they are getting signal, especially if you are sure you are not getting fire. The most likely cause would be the crank sensor, if you have access to a scanner that has live data I would hook it up and see if you a crank signal. That is the most likely cause of the no start. I have attached a link to our tutorial on symptoms of a bad crank sensor to hopefully help you understand the system a little better.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

I hope this helps you track down the cause of your no start and thank you for using 2CarPros.
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Monday, July 29th, 2019 AT 5:16 AM

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