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willysmjeeps.com :: View topic - Backfire and Hesitation
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Backfire and Hesitation
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lilm38
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Joined: Mar 25, 2006
Posts: 45
Location: Austin, TX

PostPosted: Fri Apr 05, 2024 8:39 pm    Post subject: Reply with quote

The profile location is incorrect but I haven't updated it. Should be Edinburg. Jeep is stored in Corpus. I'm heading up there tonight so should have some updates.
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lilm38
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Joined: Mar 25, 2006
Posts: 45
Location: Austin, TX

PostPosted: Sat Apr 06, 2024 5:56 pm    Post subject: Reply with quote

Ok, in reference to previous replies, upon preliminary examination, the spark plug wires are correct as shown in Wes' wiring diagram and PCV valve is plumbed properly. Is there something I'm missing in that regard?
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4x4M38
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Joined: May 30, 2014
Posts: 3447
Location: Texas Hill Country

PostPosted: Sat Apr 06, 2024 6:36 pm    Post subject: Reply with quote

It’s not uncommon to find the pcv valve installed backwards.
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Brian
1950 M38
MC11481
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wesk
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Joined: Apr 04, 2005
Posts: 16253
Location: Wisconsin

PostPosted: Sat Apr 06, 2024 8:10 pm    Post subject: Reply with quote

Main key in your post is that she ran fine until last week. You've indicated you did no mechanical repairs, replacements or adjustments that would have caused the change in behavior. So I think we are now down to waiting for your tests results.

1 - Vacuum gauge readings at idle, acceleration and 2500 RPM.
2 - Fuel pressure reading at carb inlet fitting.
3 - Compression test results.
4 - Leak down check results.
5 - Actual timing behavior static and running.

Anymore guessing at this point is simply guessing.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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RonD2
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Joined: Oct 02, 2014
Posts: 1912
Location: South Carolina, Dorchester County

PostPosted: Sat Apr 06, 2024 8:30 pm    Post subject: Reply with quote

In a post back on page 1 he said the last thing he did before the problem surfaced was replacing the Voltage Regulator.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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wesk
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Joined: Apr 04, 2005
Posts: 16253
Location: Wisconsin

PostPosted: Sat Apr 06, 2024 10:07 pm    Post subject: Reply with quote

Yes, I caught that but he said the regulator change was before the rough running started. If the regulator caused it by severely over or under charging he would have seen the issue on his amp or volt meter and mentioned it.

Main thing now is getting a very good and thorough diagnosis of the jeep's current operating conditions/parameters.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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