Backfire and Hesitation

lilm38 · Post by **lilm38** » Fri Apr 05, 2024 8:39 pm

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.

lilm38 · Post by **lilm38** » Sat Apr 06, 2024 5:56 pm

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?

4x4M38 · Post by **4x4M38** » Sat Apr 06, 2024 6:36 pm

It’s not uncommon to find the pcv valve installed backwards.

Post by **wesk** » Sat Apr 06, 2024 8:10 pm

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.

RonD2 · Post by **RonD2** » Sat Apr 06, 2024 8:30 pm

In a post back on page 1 he said the last thing he did before the problem surfaced was replacing the Voltage Regulator.

Post by **wesk** » Sat Apr 06, 2024 10:07 pm

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.