Will not start

2004 LINCOLN NAVIGATOR
190,000 MILES • V8 • 4WD • AUTOMATIC
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RANDI URQUIZU
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when i go to start my SUV everything lights up when i turn the key but wont crank over.but when i open the hood and tap the A/C compressor with a metal pole and some one turns the key at the same time it starts right up?what could be causing this problem?
May 20, 2019 at 7:33 PM
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BMDOUBLE
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The compressor can cause a cranks no start issue. It can cause noise in the electrical system that can disrupt the crank sensor signal which the power train control module requires to operate the ignition system.
May 20, 2019 at 8:22 PM
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RANDI URQUIZU
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So should i replace the whole A/C compressor or what do you recommend? Because it makes a rattling sound as you press on the gas and subsides when you release your foot from the gas.
May 21, 2019 at 5:56 AM
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STRAILER
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If I can step in here is sounds to me the starter motor has gone bad and the vibration of the tapping helps the starter work. Here is a guide to confirm the issue with a guide to walk you through the starter replacement with diagrams and instructions to help you with the job on your car:

https://www.2carpros.com/articles/starter-not-working-repair

and

https://www.2carpros.com/articles/how-to-replace-a-starter-motor

Check out the diagrams (below). Please let us know what happens.
May 23, 2019 at 2:06 PM
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BMDOUBLE
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Absolutely correct Ken! Don’t know why I didn’t think of that.
Jun 28, 2019 at 8:31 PM
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RANDI URQUIZU
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Turns out it was the A/C compressor clutch that was causing the problem.
Jun 30, 2019 at 11:04 PM
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STRAILER
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How can that be? was the compressor locked up?
Jul 1, 2019 at 11:17 AM
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BMDOUBLE
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Awesome! We’ve actually run into this at my dealership Ken, the clutch can induce noise into the electrical system and disrupt the crank signal since it is only a 0-1 volt signal. This is why hall effect sensors were later used on newer models. I’m glad you got it fixed my friend!
Jul 3, 2019 at 8:57 AM
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STRAILER
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O man! I love it, learn something new everyday :) Great info.
Jul 3, 2019 at 1:06 PM
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PATENTED_REPAIR_PRO
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i assume this was a crank and no start instead of a no crank, which just means the starter isn't cranking over the engine.
Jul 4, 2019 at 2:57 AM