After all this does unplugging the O2 still fix the problem? Eric Frank Condelli wrote: > OK, gurus I have a problem here that I have been unable to resolve >and am asking your collective help. > 1991 2.1 engined Vanagon. Running way too rich, black smoke pouring >out of exhaust tail pipe at idle and under acceleration. At cold startup it >seems to be running perfectly, no black smoke, when the engine warms up, you can >hear it change rhythm, the black smoke starts pouring out the exhaust. Let >it sit until the engine goes back to cold and restart it will run perfectly >until it warms up, drop in idle then black smoke again. > Unplugging the O2 sensor cures the problem, so I immediately though it >was a bad O2 sensor. I have done the following and NONE has resolved the >issue. New CAT, new OXY sensor (tried two), exhaust system is not leaking >anywhere. Checked & replaced Temp II sensor (original was giving same readings as >the new one but replaced anyways). Checked throttle position switch, mechanical >clicking and continuity test, OK. Checked AFM, all readings as per Bentley, >swapped in an AFM from a perfectly running 2.1, made no difference. Checked >air intake track, clear and free of obstructions. Tried swapping computers, >two different ones actually, all the same. Checked all wiring from computer >terminal plug to respective sensors, did all tests as per Bentley, all OK. >Checked all grounds, all OK. Idle stabiliser valve humming, unplugging it will kill >the engine, unplugging it by the yellow connector on the firewall drops the >rpm. Swapped in an Idle Stabiliser Control Unit from a known working 2.1, made >no difference. > So..........WHAT am I missing ???? > >Cheers > >Frank Condelli >Almonte, Ontario, Canada ><A HREF="http://members.aol.com/BusFusion/bfhome.htm">BusFusion</A> a VW Camper camping event, Almonte, ON, June 10 ~ 13, 2004 >'87 Westy & Lionel Trains >Member: <A HREF="http://www.vanagon.com/">Vanagon List</A>, <A HREF="http://www.bcn.net/~limbo/">LiMBO</A>, <A HREF="http://www.westfalia.qc.ca/">IWCCC</A> & <A HREF="http://www.ccvwc.ca/">CCVWC</A> >Vanagon/Vanagon Westfalia Service in the Ottawa Valley ><A HREF="http://members.aol.com/Fkc43/stebro.htm">STEBRO/Vanagon Stainless Steel Mufflers</A> ><A HREF="http://members.aol.com/Fkc43/busindex.html">Frank Condelli & Associates</A> or http://frankcondelli.com > > > > > > |
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