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[FIXED] 2010 jeep wrangler 3.8 other shop installed new engine, long crank P0339
- ed2
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5 years 2 months ago - 5 years 1 month ago #41486
by ed2
other shop installed reman engine, I dont know what company built it. . vehicle keeps throwing p0339 . here is what i have done so far, replaced after market sensor with mopar , CKP. tested wires from pcm to ckp. my 5 volt ref is good . my sensor ground is good ( and they are shared by other sensors) . wires to sensor ohm good, load test good , no short to ground or each other . also scoped crank and cam signals , look ok. I really an leaning towards wrong flexplate ? anyone, have any ideas
what am I missing ? Thanks for reading
Last edit: 5 years 1 month ago by Tyler.
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5 years 2 months ago #41495
by ed2
Replied by ed2 on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
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5 years 2 months ago #41497
by Tyler
Replied by Tyler on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
Could you turn the time base down? So we can get more detail in the capture. 50ms or 100ms instead of 200ms.
I'm trying to see if the three-pulse in the CMP is lining up with the low part of the CKP correctly. Here's what I'm looking for:
I'm trying to see if the three-pulse in the CMP is lining up with the low part of the CKP correctly. Here's what I'm looking for:
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5 years 2 months ago #41499
by ed2
Replied by ed2 on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
hope this helps
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5 years 2 months ago #41501
by Tyler
Replied by Tyler on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
It does. 
It sure looks like the CKP/CMP relationship is good to me. The sequence of the CMP seems correct, too.
I dunno if I'm nitpicking here? But something about this section bothers me:
In every capture, the low section of the tooth right before the sync notch is noticeably shorter than all others.
It sure looks like the CKP/CMP relationship is good to me. The sequence of the CMP seems correct, too.I dunno if I'm nitpicking here? But something about this section bothers me:
In every capture, the low section of the tooth right before the sync notch is noticeably shorter than all others.
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5 years 2 months ago #41503
by Tyler
Replied by Tyler on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
I'm suspicious of some damage to the flexplate during installation. Keep your eyes peeled.
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5 years 2 months ago #41508
by Matt T
That missing tooth part looks OK to me. It falls during the first CMP pulse and rises at about the time the 2nd CMP pulse falls.
What does look wrong is the wide CKP tooth. On the known good it's 3 regular teeth but on the OPs trace it's only two. And the known good has 16 regular teeth left of the big tooth and 15 to the right of it. The OPs has 16 to the right.
I would've marked up the pictures to show this better but no right click
Replied by Matt T on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
Tyler wrote: I dunno if I'm nitpicking here? But something about this section bothers me
That missing tooth part looks OK to me. It falls during the first CMP pulse and rises at about the time the 2nd CMP pulse falls.
What does look wrong is the wide CKP tooth. On the known good it's 3 regular teeth but on the OPs trace it's only two. And the known good has 16 regular teeth left of the big tooth and 15 to the right of it. The OPs has 16 to the right.
I would've marked up the pictures to show this better but no right click
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5 years 2 months ago #41518
by Matt T
Replied by Matt T on topic 2010 jeep wrangler . 3.8. other shop installed new engine , long crank ,p0339
I suspect the flex plate has had an extra notch punched in it. This pic I found shows the high sync being 3 regular teeth wide just like the known good.
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