YJ 4.2 Hesitation when second barrel of Weber opens - Jeep Wrangler Forum

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Old 03-26-2012, 07:30 AM
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YJ 4.2 Hesitation when second barrel of Weber opens

I have what seems to be a unique issue.

89 Wrangler 4.2, nuttered, only emissions that remains is the vapor canister. Installed Weber 36 DGEV, new plugs/wires, new fuel filter and pump, coil and cap looks new from the PO. Installed Borla header, new intake (stock version) new catalytic converter, and muffler.

At idle the engine runs perfectly and seems to be timed near perfect. Under light acceleration it runs up to 3-4k rpm smoothly and the second barrel of the carburetor opens with no hesitation. Now same scenario but heavier acceleration and once the throttle reaches the point of opening the second barrel it falls flat on its face like it is getting no fuel and then will run up no fine after a second of the hesitation.

Any ideas? I've had no luck calling weber tech support, will continue calling to see if they think it is a jet issue or accelerator pump.
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Old 03-26-2012, 07:59 AM
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I should note that sometimes it backfires during this hesitation/bogging event, however if accelerating in a higher gear it doesn't backfire.

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Old 03-26-2012, 08:52 AM   #3
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I had a weber for over a year and had the same problems, also good luck with weber/redline customer support. I tried calling and leaving messages for almost a week and never heard squat.

Do you have a fuel regulator installed?
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Old 03-26-2012, 09:22 AM
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I had the Mr.Gasket one installed for awhile and didn't notice a difference. Doesn't seem plausible that fuel pressure could be blamed based on how it boggs down and the return line style fuel filter should prevent over loading of fuel.
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Old 03-26-2012, 09:37 AM   #5
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With your fuel filter, is the return line at the 12 o'clock position?
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Old 03-26-2012, 09:51 AM
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Yes
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Old 03-26-2012, 09:52 AM
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BDK, Did you test different Jet sizes when you had the Weber?
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Old 03-26-2012, 10:06 AM   #8
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I had the shop jet it, I would have to check my receipt, but I think they were 1.08 jets
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Old 03-26-2012, 10:40 AM
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Did the Jets fix the hesitation?
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Old 03-26-2012, 11:02 AM   #10
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Quote:
Originally Posted by bdr3355 View Post
Did the Jets fix the hesitation?
No, I always had issues with the weber. Thats why its for sale right now on CL and a MC2150!
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Old 03-26-2012, 11:11 AM
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Hmmmm... that isn't very reassuring. It seems like people have good luck with them, but reading up on this hesitation issue today has lead me to think otherwise.
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Old 03-27-2012, 10:17 AM
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I'm curious now, what carburetor did you find that worked correctly for your setup?
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Old 03-27-2012, 11:44 AM   #13
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I'm curious now, what carburetor did you find that worked correctly for your setup?
the 2150, its way easier to tune. I am going to do a MPI conversion this summer.

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