Re: Definitely EVO sensor!

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Posted by NJCKZ71 on April 07, 2003 at 17:18:13:

In Reply to: Re: Definitely EVO sensor! posted by 96Z on April 07, 2003 at 16:41:02:

The search feature here at PA is down, but we have volumes of information in it about the EVO sensor. If memory serves (my books are all at home), your 96 doesn't have variable assist steering, unless there were some odd end of build year trucks that someone received it... I fairly certain 97 was the first year of it's use in the OBS trucks, and 1997 trucks suffer the worst from it.

Anyway, the problem is covered under GM TSB 86-32-06. The Electronic Variable Orifice (EVO) sensor basically controls how much power assist is applied while steering. The problems results from dirty electrical contacts in the sensor producing a high sensor resistance which is interpreted by the computer to apply full power assist. This can be a constant apply or an erratic apply. The sensor is located at the base of the steering column and is an easy R&R, but a little tough to get at easily. The most recent revision of the sensor is P/N 26081626. There are two previous revisions that should not be used, but are sometimes still found in old parts stock.

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