C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Mini Ram needs new AFR

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Old Jan 5, 2005 | 10:38 PM
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Default Mini Ram needs new AFR

I might be closer to diagnosing my rich condition. It seem that the ari-fuel ratio does not respond to either the adjust screw nor disconnecting the vacuum line.

What is the fix for this guy? Is there a better unit out there?
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Old Jan 5, 2005 | 11:39 PM
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Sounds like you need a new fuel pressure regulator. The rubber diaphram inside is probably torn...That would make it run rich, but you should be able to lower the fuel pressure with the adjusting screw...Somthing is definatly screwy...
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Old Jan 6, 2005 | 11:39 AM
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Originally Posted by ZD1
I might be closer to diagnosing my rich condition. It seem that the ari-fuel ratio does not respond to either the adjust screw nor disconnecting the vacuum line.

What is the fix for this guy? Is there a better unit out there?

Do you mean the fuel pressure is not responding? it will take a substancial fuel pressure change to actually see an afr change.
ive move my fuel pressure from 48lbs to 40lbs and have only seen a .5 difference in afr.
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Old Jan 6, 2005 | 11:09 PM
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I found a vac leak in my MR AFPR where the two parts clamp together. I took it apart, resealed the unit and the adjusting screw, works fine.

Good luck, Dave
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Old Jan 7, 2005 | 02:37 AM
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You can buy a new diaphram at your local parts store for about $5, thats what I had to do with my AFPR on my Miniram.
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