Another case of self inflicted damage. I've been fighting a O2 lean code then O2 rich code for a year now. Rebuilt carb set the settings to factory etc. Try to adjust mix. solenoid nothing happens. Well found out it was the computer itself. O2 sensor was sending the right info but the computer was misreading it. Wouldnt change mix. dwell no matter what you did. Just changed the computer yesterday. Now I have feedback and dwell changes etc. However...

I royally screwed up all the settings. Is the front screw the lean stop and the one in the air horn the rich stop? How should the front screw be set? I have a manual but of course its at work.

I set the travel to slightly more than 3/32 cant seem to get more without moving the forward screw. Than it wont idle. Also if the settings are messed up can the car act like a bad fuel pump? If I leave the car in second under load at 3000rpm I get a surge like no fuel. I stop and get on it the next time it'll run fine unless I hold it the rpms up for awhile. Just wondering if I'm still fighting 2 problems.

 

Well I ordered the guages today. And photocopied the manual at work. If anybody else needs the adjustment instructions the pages can be found at my site : http://communities.msn.com/Mytruckso...msnw?Page=Last

The copies arent the best but if you enlarge they can be read.

 

I don't really want to DL all those pages, so i'll just briefly hit you with the way to set the lean and rich stops.
You need to pull the airhorn to set the lean stop. You'll need the lean stop measuring tool, which is just a tube of some spec length that slides over a primary jet. You then set the lean stop so that the solenoid rider just contacts that tube when at the bottom of it's travel.
Then you just set the rich stop to 4/32 +/- depending on what your car likes. My 85 liked 5/32 best, made a decent difference covering a part throttle flat spot. WOT is unaffected by travel BTW, at least in my testing it was. I tried everything from max (~6/32 in my carb) down to nothing and ran near identical et/mph.

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Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
305 TPI A4 2.73 - 14.7 @ 93.6
Stock except ported plenum and dual cats
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

thanx for the reply. got it figured out. Reason I was having so much trouble, the idle mixture screws were too lean. Then I had to tighten down the rich mixture stop screw too far. This stopped the solenoid travel too soon causing only 2/32s travel. Once I backed out the mixture screws I was able to get everything else back in line. Works much better.

 

P.S I was only posting the pages as a reference for others.