Wont crank and stalls when driving

Tiny
BFT1211
  • MEMBER
  • 1998 JEEP CHEROKEE
  • 210,873 MILES
Sometimes when driving it stalls and backfires and stops and wont start back up for ten to fifteen min it also sometimes is hard to get it to crank up ive replaced the map sensor crank sensor and fuel pump what else could make it do that.
Wednesday, November 6th, 2013 AT 5:42 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This sounds there might be an issue with the coolant temperature sensor.
The coolant temperature sensor sends signal to the ECM about the engine temperature by changing its internal resistance value. As the temperature changes so does the resistance value. A faulty sensor can send signaling that the engine is 'too hot' to operate. This will keep the engine from starting.
As you mentioned you can start it after some time it is an indication that when the engine cools just a little the temperature sensor sends correct signal, and the engine starts.

There coolant temperature sensor is located on the thermostat housing (see diagram).

Here are some helpful articles:

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor
https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

I have attached the coolant temperature sensor resistance chart below. You can use that to determine if the sensor is bad.

Please let me know of any questions.
Thank you.
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Monday, October 11th, 2021 AT 7:12 AM

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