 Air/Fuel mix experts needed. |
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| malcolm2 |
 Sep 30 2026, 04:04 PM
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Advanced Member  Group: Members Posts: 2,752 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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Hey hey... I need some suggestions. I went for a nice drive last nite. I have a AFR gauge that has not been working. But the PLX Devices system has a blue tooth transmitter so i can review the live data on my phone.
I was getting 10.5 A/F reading. It did jump to 12.5 as i went to neutral and coasted to a stop. To start with, I was thinking i would pull the sensor and take a look, maybe clean it up and re-drive. Any ideas about the 1st steps? The car seemed to run fine. I will need to look them up here, but years ago I had a reply from, I believe, Mark Henry that gave me the following: 13.5-12.9 while accelerating of climbing 12-8-12.5 at WOT 16-17 going downhill or decelerating. 1911 cc L-Jet. I did tweek the AFM back in the day. 62,000 miles ago. the link to the 5 page post from 2017 |
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| malcolm2 |
Oct 4 2026, 10:56 AM
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Advanced Member Group: Members Posts: 2,752 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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intenerant air cooled community SPRING ADJUSTMENT
I used that link some 10 or 15 years ago. Guess I will read thru it again. That spring could POP at any second during my operation.... IIRC I had to adjust, then adjust once more. So i did it twice. It was very scary. (IMG:style_emoticons/default/piratenanner.gif) So that being said, this car has run with that spring setting for more than 10 years. What would all of a sudden make it so rich? After i check the AFR set-up, I might go to the 5th injector. Maybe it is stuck. Any other thoughts, let me know. I have a few days of home time before the kids fall break. Clark 615-504-1086 |
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| emerygt350 |
Oct 4 2026, 12:55 PM
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Advanced Member Group: Members Posts: 3,788 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
QUOTE(malcolm2 @ Oct 4 2026, 10:56 AM)  intenerant air cooled community SPRING ADJUSTMENT I used that link some 10 or 15 years ago. Guess I will read thru it again. That spring could POP at any second during my operation.... IIRC I had to adjust, then adjust once more. So i did it twice. It was very scary. (IMG:style_emoticons/default/piratenanner.gif) So that being said, this car has run with that spring setting for more than 10 years. What would all of a sudden make it so rich? After i check the AFR set-up, I might go to the 5th injector. Maybe it is stuck. Any other thoughts, let me know. I have a few days of home time before the kids fall break. Clark 615-504-1086 I am not an ljet guy but there must be a temp sensor or two in the system, not just the flapper. If one of those goes, or the ground/wiring is funky, it might send it rich. That is the first place I look on fuel injection cars. |
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Posts in this topic
malcolm2 Air/Fuel mix experts needed. Sep 30 2026, 04:04 PM
JamesM 10.5 is way rich
Probably not impacting to much o... Oct 1 2026, 01:19 PM emerygt350 Not sure what brand of gauge you have but my auto ... Oct 2 2026, 06:11 AM malcolm2 Yes, the reading is low. Question is how can i cha... Oct 2 2026, 06:24 AM
JamesM
So looking for pointers on the AFR system and mak... Oct 2 2026, 08:24 AM Literati914 On my last build I had similar issues - turned out... Oct 2 2026, 09:33 AM JamesM
So that being said, this car has run with that ... Oct 4 2026, 01:53 PM |
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