Will not start

1997 MERCURY MOUNTAINEER
165,000 MILES • 5.0L • V8 • AUTOMATIC
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LINDA EGAN
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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?
Nov 17, 2018 at 11:18 AM
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ASEMASTER6371
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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
Nov 17, 2018 at 11:34 AM
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LINDA EGAN
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Yes and no fuel pressure and no sound when I turn on key. It ran when i put it in garage to change oil.
Nov 17, 2018 at 11:39 AM
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LINDA EGAN
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Did not check for spark.
Nov 17, 2018 at 11:43 AM
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ASEMASTER6371
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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

Nov 17, 2018 at 11:58 AM
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LINDA EGAN
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Sorry about that. Not yelling. Yes we checked all fuses and relays. They are good. It ran good before with no problems.
Nov 17, 2018 at 12:05 PM
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ASEMASTER6371
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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
Nov 17, 2018 at 12:08 PM
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LINDA EGAN
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Yes we have that.
Nov 17, 2018 at 12:11 PM
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ASEMASTER6371
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Okay, do you have power to the inertia switch?

Roy
Nov 17, 2018 at 12:13 PM
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LINDA EGAN
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Yes it not popped out either.
Nov 17, 2018 at 12:14 PM
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ASEMASTER6371
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Okay, if you have power to the switch then you have a bad fuel pump.

Roy
Nov 17, 2018 at 12:16 PM
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LINDA EGAN
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Will check that. Thank you.
Nov 17, 2018 at 12:17 PM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Nov 17, 2018 at 12:19 PM
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LINDA EGAN
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Now have fuel but no spark.
Nov 19, 2018 at 10:27 AM
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ASEMASTER6371
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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
Nov 19, 2018 at 11:30 AM
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LINDA EGAN
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No but some times it worked and sometimes not.
Nov 19, 2018 at 12:36 PM
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ASEMASTER6371
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Sometimes what worked?

Please explain.

Roy
Nov 19, 2018 at 12:38 PM
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LINDA EGAN
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The tachometer.
Nov 19, 2018 at 12:43 PM
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LINDA EGAN
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Sometimes the tachometer would work then it did not work while driving.
Nov 19, 2018 at 12:44 PM
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ASEMASTER6371
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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.
Nov 19, 2018 at 12:56 PM
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LINDA EGAN
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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.
Nov 24, 2018 at 12:10 PM
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ASEMASTER6371
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I thought you said the fuel pump worked? Bypassing it is not a way of fixing it.

Roy
Nov 24, 2018 at 12:39 PM
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LINDA EGAN
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He just told me he used the bypass. Could it be a coil pack?
Nov 24, 2018 at 12:54 PM
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ASEMASTER6371
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No, a coil will not cause no fuel pump. The circuit needs to be checked to see why the pump wont work. Back a few responses, you told me you had power to the inertia switch. Your issue is between the switch and the pump.

As far as the spark, you will need a scan tool to check the system. If you do not have a scan tool, you will need someone to check the system for you to verify the ignition switch and the PCM.

Roy
Nov 24, 2018 at 3:09 PM
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LINDA EGAN
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We tried to use a scan tool but it comes up link error. We tried a couple different ones and they said the same thing.
Nov 24, 2018 at 3:31 PM
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ASEMASTER6371
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Usually when there is no communication, it indicates a possible PCM failure.

You need someone to check this for you.

Roy
Nov 24, 2018 at 4:34 PM
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LINDA EGAN
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Replaced the PCM.
Nov 24, 2018 at 5:39 PM
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ASEMASTER6371
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Why?

I never even told anything about that.

Did you have it flashed to your car? Did you have the key programmed?

Roy
Nov 24, 2018 at 5:40 PM
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LINDA EGAN
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I told you we replaced the PCM in the first message along with checking fuses. Yes and yes.
Nov 24, 2018 at 6:37 PM
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ASEMASTER6371
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Does the check engine light come on when the key is on?

Roy
Nov 24, 2018 at 7:08 PM
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LINDA EGAN
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Yes.
Nov 24, 2018 at 7:11 PM
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ASEMASTER6371
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What type of scan tool are you using? Is it a code reader or full blown scan tool?

Roy
Nov 24, 2018 at 7:15 PM
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LINDA EGAN
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Can obo/eobd11 memo scanner.
Nov 25, 2018 at 10:25 AM
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ASEMASTER6371
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You are going to need a real scan tool such as snap on, tech 2 or something equivalent.

You may want to consider having someone come to you instead of a tow truck to a shop to at least diagnose it for you.

Roy
Nov 25, 2018 at 10:36 AM
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LINDA EGAN
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We are just leaving it. We have spent too much money trying every thing everyone was telling us what was wrong. The scanners do not work so no use taking it to someone else to run up the bill. Thanks for your help.
Nov 25, 2018 at 3:32 PM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Nov 26, 2018 at 3:58 AM