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Old 10-28-2004, 06:37 PM   #1
auger
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Question EVO/Non-EVO Steering pump differences

Can anyone tell me what the difference is between a pump with EVO and one without? Is it that the reservoir only, the fact that the EVO equipped pumps have a reservoir that accepts the EVO unit and the non-EVO pumps don't?
Reason I ask is, I have a '99 non-EVO pump I got from a wreckers, and my '92 leaky-noisey pump is EVO, if I could swap reservoirs on these would that be the way to go with this?
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Old 10-28-2004, 09:49 PM   #2
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Basically none. An EVO pump installed in a non-EVO car with it's EVO connector left disconnected will simply be on full boost (assist) all the time. IF however you install a non EVO equiped pump on a car that has the wiring for an EVO equiped pump, meaning there is nothing to plug the EVO connector to, the pump will still deliver full assist all time....and an SES light ...all the time.
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Old 10-28-2004, 10:07 PM   #3
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besides that darn light
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Old 10-29-2004, 12:01 AM   #4
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Are you sure that your 92 SL1 has the EVO on the PS? As far as I know it was availible on the DOHC engines only not the SOHC ones. If there is an electrical connector to the PS pump then it does have EVO. No electrical connector then no EVO.
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Old 10-29-2004, 01:17 PM   #5
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Thanks guys, Ssicarman, mine has the electrical connection, apparantly Saturn stopped offering EVO on SL1s around '95 or so and it became something the more expensive models got.

I have found a rebuilt for $237 with EVO, I think I'm gonna bight the bullet and buy it, my car is still running very well and uses about a half quart of oil between services.

Thanks again for the excellent advise.
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Old 10-29-2004, 01:46 PM   #6
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what does EVO stand for?
Electrical Valve Operation??? I'm just guessing...
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Old 10-29-2004, 03:08 PM   #7
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Electronic Variable Orifice, according to my Chiltons......
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