Hi all. The protective cap on the CO screw was drilled and tapped. Checked CO screw setting. It's all the way in. Emissions test results seemed quite low (HO, CO, NOx), plug colour was grey. Image: https://lh3.googleusercontent.com/-HsjvHzL5ew0/T6iOlOpuTII/AAAAAAAAFvI/Gox0nzYwBXg/s640/1988%2520Westy%2520Spark%2520Plugs%2520.jpg Engine has a pretty consistent surge coasting in 2nd or 3rd gear @ ~ 2500 RPM down, and a mysterious stall, engine cold. Stall happens once. When engine temp higher, engine runs "ok". Reading this post from Dennis: http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind0201A&L=vanagon&P=R7346&m=155177 I have to wonder if the CO adjustment is currently affecting the fuel shut off process thus causing surging. A fuel cut off issue was one of my original thought towards the surging issue. I've done a full tune up, new O2 sensor & cat, cleaned grounds, repositioned AFM wiper, adjusted throttle valve switch. (it consistently closes just off idle), swapped idle stabilization module (old one causes idle issues when swapped back in). I don't have a sniffer, CO port is badly corroded. I've seen posts in archives suggesting a base setting for CO adjust screw is anywhere from 1.5 to 3.5 turns from seated in. Can anyone confirm or suggest a base setting? Hopefully a sniffer inserted in the tailpipe will suffice to check my work. Thanks, Neil. -- Neil n 65 kb image Myford Ready For Assembly http://tinyurl.com/64sx4rp '88 Slate Blue Westy to be named. '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ Vanagon VAG Gas I4/VR Swap Google Group: http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines |
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