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Thread: carb backfire.

  1. #1

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    carb backfire.

    So as I was driving today my Ram decides to back fire my whole trip. So I belie it is running rich. Any ideas? Or does it just need a good carb adjustment? Thanks

  2. #2



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    Did it just start to do it? I would look at timing then the jet valves and adjustment. then the cam timing in that order. One leads to another and when you got the cover off it's only a quick look to check things.
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  3. #3

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    Just started today.

  4. #4



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    Somthing is getting off. Check timing and plugs, cap rotor. All the usual things. You will find it. I bet 5 bucks it's a jet valve going bad.
    Do a vacuum gage test and see if the needle is holding steady or whipping back and forth.
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  5. #5

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    If so. I have spares and a delete kit. 👍

  6. #6

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    I wouldn't have commented on what the carby backfire issue could be caused by - none of the G63B engines that were installed in Australian sold vehicles had jet valve heads. I did get a cheap low km G62B from an importer that has the jet valve head. Good to know that this could be a symptom of a roasted jet valve.

  7. #7

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    Should I delete the valves if this is the issue?

  8. #8



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    Yes get rid of them.. We had a guy that had one going bad and it would blow vacuum lines off. Along with the backfire and low power.
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  9. #9

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    So I deleted the jet valves and it rid of the problem for about a day, then it began to backfire yet again. :/ I'm checking the timing with a light, when I can actually see the light and marks.

  10. #10



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    Did you check the valves with a vacuum gage. The needle should hold nice and steady
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  11. #11

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    it was timing with the dizzy. runs great now!

  12. #12

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    Wonder what caused it to pull so far out of timing...

  13. #13

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    Indeed.

  14. #14



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    So it was somthing simple after all.. Good for you.
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  15. #15

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    It's crazy how much a little thing can change so much on engines.

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