OK, I will do the load test tomorrow. I need to be at a meeting about 15 miles away, so I will take a route that should provide at least 30 minutes of driving.

So you want to see a snapshot after driving, at least 40 minutes, along with the STFT and LTFT numbers?

I will also swap the S2 sensors and see if anything changes.

One other piece of information, re: your mention of the sensor heaters.

Soon after I bought the car, the CEL came on with a bizarre collection of codes. Both cam timing solenoids, air pump relay, all four sensor heaters, purge valve current and a couple of others. This, I believe, was caused by the 20 amp fuse in the base module being blown. I replaced the fuse, and after about 100 miles the first P0153 occurred. I replaced the sensors, and after another 100 miles, the second P0153.

Thanks for your insights on this.

Thanks for your insights on this.

PS, two log files from the short load and idle runs are attached. If there is an idle moment, one can go to http://www.obddiagnostics.com/index.html to download the free software, and use it to play back the logs. This is actually kind of cool.

Attached Files

	OBD Log 3*30*08 17·39 Load .txt (7.4 KB, 186 views)
	OBD Log 3*30*08 17·45 idle.txt (7.6 KB, 148 views)

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe