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Will not start

Tiny
LINDA EGAN
  • MEMBER
  • 1997 MERCURY MOUNTAINEER
  • 5.0L
  • V8
  • AUTOMATIC
  • 165,000 MILES
Changed oil and window motor. Ran good before that, went to start it and it just cranks and will not start. Checked fuses and relays and are good. Replaced battery and computer still just cranks. Checked the safety fuel switch and not popped up.
Do you have any ideas?
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Saturday, November 17th, 2018 AT 11:18 AM

35 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Did you have the replacement PCM flashed to your car?

Do you hear the fuel pump come on with the key on? Can you test for fuel pressure?

Did you check for spark?

Roy

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-test-an-ignition-system

https://www.2carpros.com/articles/car-cranks-but-wont-start
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Saturday, November 17th, 2018 AT 11:34 AM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Yes and no fuel pressure and no sound when I turn on key. It ran when I put it in garage to change oil.
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Saturday, November 17th, 2018 AT 11:39 AM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Did not check for spark.
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Saturday, November 17th, 2018 AT 11:43 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Please use lower case. It looks like you are yelling at me.

Check all your fuses with a test light for power on both sides.

Roy
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Saturday, November 17th, 2018 AT 11:58 AM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Sorry about that. Not yelling. Yes we checked all fuses and relays. They are good. It ran good before with no problems.
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Saturday, November 17th, 2018 AT 12:05 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Need to verify power to the fuel pump relay with the key on. You should have two powers. One to the control side and one for the load side.

Roy
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Saturday, November 17th, 2018 AT 12:08 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Yes we have that.
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Saturday, November 17th, 2018 AT 12:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, do you have power to the inertia switch?

Roy
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Saturday, November 17th, 2018 AT 12:13 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Yes it not popped out either.
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Saturday, November 17th, 2018 AT 12:14 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, if you have power to the switch then you have a bad fuel pump.

Roy
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Saturday, November 17th, 2018 AT 12:16 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Will check that. Thank you.
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Saturday, November 17th, 2018 AT 12:17 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Saturday, November 17th, 2018 AT 12:19 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Now have fuel but no spark.
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Monday, November 19th, 2018 AT 10:27 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
When you crank the engine, does the tach move up a little while cranking?

Trying to see if the crank sensor is working.

Roy

https://www.2carpros.com/articles/how-to-test-an-ignition-system
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Monday, November 19th, 2018 AT 11:30 AM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
No but some times it worked and sometimes not.
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Monday, November 19th, 2018 AT 12:36 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Sometimes what worked?

Please explain.

Roy
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Monday, November 19th, 2018 AT 12:38 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
The tachometer.
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Monday, November 19th, 2018 AT 12:43 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Sometimes the tachometer would work then it did not work while driving.
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Monday, November 19th, 2018 AT 12:44 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You may have a failing crank sensor which sends a signal to the PCM for creating spark.

Roy

1. Disconnect the battery ground cable.

NOTE: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 mi) or more to relearn the strategy.

ImageOpen In New TabZoom/Print

2. Remove the Crankshaft Position (CKP) sensor.
1 Disconnect the CKP sensor electrical connector.
2 Remove the screws.
3 Remove the CKP sensor.

INSTALLATION

imageOpen In New TabZoom/Print

1. Install the CKP sensor.
1 Position the CKP sensor.
2 Install the screws.
3 Connect the CKP sensor electrical connector.
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Monday, November 19th, 2018 AT 12:56 PM
Tiny
LINDA EGAN
  • MEMBER
  • 19 POSTS
Hi again. We put in a new crank sensor and it still does not start. The fuel pump dont pump unless we put a fuel by pass relay in. Any ideas? Husband is all out.
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Saturday, November 24th, 2018 AT 12:10 PM

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