Posted by Steven [162.158.255.90] on Friday, February 12, 2016 at 20:46:17 :
In Reply to: Re: 1988 W250 High idle at start up posted by daveyk [173.245.54.13] on Friday, February 12, 2016 at 20:33:26 :
OK, thanks. On this engine, the air pump is single routing to the injection tube of the CAT. The O2 sensor is at the base of the driver's side exhaust manifold. So, the O2 sensor is upstream of the CAT.
I have not verified that the air pump actually functions as intended, nor have I taken any readings from the O2 sensor.
AIS is on the list for sure.
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