Starts, runs, then shuts off

INTRIKEHT

MEMBER
2001 MAZDA 626
2.5L
6 CYL
2WD
AUTOMATIC
125,922 MILES

My car starts and runs fine for about half an hour to two hours, but then it suddenly stalls out. I have recently changed fuel filter and air filter in engine bay, it was my first time doing so, so iam not 100% sure I put everything back the way it was, near the air intake system and engine block.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

Does the vehicle start right back up or do you need to wait awhile? I'm asking because it isn't odd for a failing crankshaft position sensor to act this way. When they start going bad, heat affects them and when the cool, they can start working again.

Take a look through this link and let me know if what you experience mirrors what is described.

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

If restarting it is delayed, check to see if there is spark to the plugs. If there isn't, the crank sensor is my first suspect.

IF you find it is bad, here are the directions for replacement. Pic 1 shows location.

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2001 Mazda 626 ES V6-2.5L DOHC
Procedures
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Service and Repair Procedures
PROCEDURES
1. Disconnect the negative battery cable.
2. Disconnect the crankshaft position sensor connector.
3. Remove the crankshaft position sensor.
4. Install in the reverse order of removal.

Tightening torque: 7.9 - 10.7 N.m 80 - 100 kgf.cm, 69.5 - 95.4 in.lbf

5. Inspect the air gap.

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Let me know if this helps or if you have other questions.

Take care,
Joe

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