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Cranks but will not start

Tiny
DALTON59
  • MEMBER
  • 2002 JEEP LIBERTY
  • 3.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Car was missing and then it would not start at all. Have replaced plugs crank sensor, cam sensor and coils. Still fires but will not start.
Wednesday, December 5th, 2018 AT 10:05 AM

19 Replies

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

Are there any codes stored in the PCM?

https://www.2carpros.com/articles/check-engine-light-top-ten-reasons

Have you tested for fuel pressure? You can try to spray some starting fluid into the air filter and see if it starts and stalls. That will tell us if it is fuel related.

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

Did you check for spark?

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

Lastly, did you test for compression?

https://www.2carpros.com/articles/how-to-test-engine-compression

You need fuel, spark and compression for this to run.

Roy
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Wednesday, December 5th, 2018 AT 12:14 PM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
No codes. Have checked all that you asked. It has me stumped Tried starting fluid too it did nothing. Did not even try to start it just kept cranking.
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Thursday, December 6th, 2018 AT 10:15 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
Everything works fine but it just will not start.
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Thursday, December 6th, 2018 AT 10:16 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you verify spark at the spark plugs?

What was the compression?

Roy
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Thursday, December 6th, 2018 AT 10:29 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
My friend is a mechanic and he did both and said the compression was good.
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Thursday, December 6th, 2018 AT 10:35 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
He is thinking it may have jumped time, but no indication it has.
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Thursday, December 6th, 2018 AT 10:36 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
He is a mechanic? If the compression is good, then it is not the timing. If the timing was an issue compression would be off.

He missed something here. I would look for someone else to help you with your checks.

Roy
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Thursday, December 6th, 2018 AT 10:49 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
Is there anything else that you could think it could be? I am scratching my head here.
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Thursday, December 6th, 2018 AT 10:58 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
The guy I had check compression is only mechanic I know.
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Thursday, December 6th, 2018 AT 10:59 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to start with basics.

1. Spark

2. Fuel pressure. Need exact reading not it is okay.

3. Compression. Need exact numbers.

If you cannot do it yourself, I would consider a mobile tech to at least do this portion of the testing.

Roy
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Thursday, December 6th, 2018 AT 11:03 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
He had exact reading I just did not write it down.
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Thursday, December 6th, 2018 AT 11:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I want to help but remember I am here and not there and I need exact information.

Keep me updated.

Roy
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Thursday, December 6th, 2018 AT 11:19 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
No problem. Thank you. I will do that.
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Thursday, December 6th, 2018 AT 11:41 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

Roy
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Thursday, December 6th, 2018 AT 11:54 AM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
Just an update here. Timing chain gear broke.
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Sunday, December 9th, 2018 AT 1:00 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Oh, sorry to hear that.

Most likely you have damaged valves from that issue. Then I would like to know what caused it to break. They do not just break for no reason.

I would be ready to consider changing the engine at this point.

Roy
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Sunday, December 9th, 2018 AT 1:19 PM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
Picture.
Image (Click to make bigger)
Thumb
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Sunday, December 9th, 2018 AT 2:03 PM
Tiny
DALTON59
  • MEMBER
  • 12 POSTS
Think it is called the key way.
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Sunday, December 9th, 2018 AT 2:04 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, that is correct.

Roy
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Sunday, December 9th, 2018 AT 2:09 PM

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