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Carburetted and TBI Injected Feel free to discuss any subject that is specific to these cars, including but not limited to: modification, tuning, repair, parts replacement, identification and restoration. This is the place to talk about ALL-MOTOR performance and MPI conversions.

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Old 01-18-2013, 01:50 PM   #1
Weber Carb jet size needed  
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1987 Omni, 2.2 manual. Previous owner swapped the Holley for a new Weber. I think the jets are wrong. I am getting only 21 mpg, the car is dieseling during shut off, and during load (like 5th gear driving up hill, or acceleration in 3rd is when I see it most but it is in all gears) the car studders. Not bad, just a quick spit. During idle the car is smooth. During most driving the car is smooth. But I have never went on a single trip where the car did not spit and spudder during driving. And even when is does spit and spudder it is so subtle that the car doesn't even really notice. It still accelerates but still...I can feel it. I have replaced the coil, plugs, cap, rotor, wires, HEP, alternator. I timed and then retimed the car. I am not 100% certain the issue is in the carb, but I don't know where else it could be. My main question is what size jets are stock for these cars? I wanna verify the jet size is right and see if the issue goes away, gets worse/better. Besides, my MPG's are terrible, I hope it because I am running to rich. The previous owner removed the power loss light so I am not sure if I have any codes.
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Old 01-18-2013, 02:51 PM   #2
Re: Weber Carb jet size needed  
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i am pretty sure i have them written down in my shop, i will have to look and get back with you, and i dont think the carb cars had the power loss light as my turismo did not come with one

i have a few jets but they are not stock and they go up to 600 which is WAY to big for stock purposes
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Old 01-18-2013, 04:39 PM   #3
Re: Weber Carb jet size needed  
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Thanks 92TurboTona. Please check at the shop when you can. I have two carb jet kits so I know I have plenty of jets, just need to find the right one. I removed my dash and I have a power loss light lens and a place for a bulb behind it...maybe someone swapped them in the last 26 years.
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Old 01-19-2013, 02:42 AM   #4
Re: Weber Carb jet size needed  
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i will try to get them in the morning, as i did not have time today, the paper is in my carb rebuild gasket package

my turismo didn't have the power light, but it was there just not hooked up as i was told the spark computer didn't have the ability for it, but i am not sure
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Old 01-19-2013, 10:34 AM   #5
Re: Weber Carb jet size needed  
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okay goes as follows

Main Jets
primary-140
secondary-137

Main Wells (emulsion tubes) these sizes may be different than yours (let me know)
Primary- F66
secondary-F50

air jets
Primary-? cant find it
secondary-160
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Old 01-19-2013, 03:55 PM   #6
Re: Weber Carb jet size needed  
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No dice! My jets are the same ones that you mentioned above. I guess I got something else causing 21mpg and that skip/studdering.
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Old 01-20-2013, 12:34 AM   #7
Re: Weber Carb jet size needed  
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sounds like you may have a vac leak somewhere causing your studder and skipping and how old is the carb as it may just need a rebuild to freshen it up, your power valve diaphragm may be bad also, kits are only about $15 plus 10 for the power valve as thats what i paid for my kit from

Repair Kits and Parts for 32/36 DFAV / EV carburetors

also check your float level and the needle and seat for any indentations on the rubber tip, if any replace the needle and seat assembly
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Old 01-20-2013, 06:01 AM   #8
Re: Weber Carb jet size needed  
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Hey bro, I just recently ordered a complete remanufactured Holley carb from Advance Auto for my '85 Plymouth Horizon. Most likely your car came stock with the Holley 6520 (feedback carb). That's the route I would take. If it doesn't fix the problem you can send it back or take it to your local Advance Auto store and get a full refund. Good luck!
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Old 01-20-2013, 08:26 AM   #9
Re: Weber Carb jet size needed  
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The weber carb is new. I'd say less than 4 months old. The only vac line I have is to the spark control. There is a bigger vac line from the valve cover to the breather box to but not really what I'd consider a vac "line". That's the only vac lines I have. Or that I see anyway. The car did come with a Holley. I still have it but it would require a rebuild. I have rebuilt ford big block carbs. But if my weber is new...whats the point? I swapped HEP's with a NA HEP instead of the turbo HEP that was on it. I doubt it will be the culprit.
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Old 01-20-2013, 08:32 AM   #10
Re: Weber Carb jet size needed  
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I will say that even I have timed the car twice...when I check the marks with my light I see the mark almost every time. But there are times when it flashes and the mark isn't there. I posted on this subject in Help section. It's odd...I have never had a TD timing mark jump around like it does. I'll post a video if you guys wanna see what I mean.
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Old 01-20-2013, 11:29 AM   #11
Re: Weber Carb jet size needed  
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yeah post a vid
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Old 01-20-2013, 07:20 PM   #12
Re: Weber Carb jet size needed  
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Here is the video. Sorry for the odd strobe effect. If you watch though you can clearly see the timing mark in the sight window and then gone for the next few flashes.

http://www.flickr.com/photos/59451236@N06/8399611905/
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Old 01-21-2013, 11:52 AM   #13
Re: Weber Carb jet size needed  
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do you have a spare spark module to try and is your vac line to the spark computer good
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Old 01-21-2013, 03:53 PM   #14
Re: Weber Carb jet size needed  
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No I don't have a spare. I'll double check but im pretty sure I do not. The previous owner put in a new one that says for off road use only. The vac line to the module is new.
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Old 01-22-2013, 10:46 AM   #15
Re: Weber Carb jet size needed  
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something is out of adjustment, when you timed the motor was the tangs on the intermediate shaft parallel with the block under the dizzy
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