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Old 07-06-2008, 01:03 PM   #1
mr18436572
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2000 SL2
Default Power steering pump - EVO or not?

need to buy a power steering pump and i see that they sell them either with or w/o the EVO (electronic variable orifice component) unit. how can i tell which pump is the one for my car? 96 saturn SL2

also what does this EVO system do?

thanks!
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Old 07-06-2008, 01:08 PM   #2
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Default Re: Power steering pump - EVO or not?

My understanding is, that the EVO allows variable assist, more assist at low speeds and less at higher speeds. Somehow controlled by the computer.

(BTW, I was reading about various power steering problems (leaks, expensive hoses) and priced a replacement manual PS rack on Saturnparts.net, all racks are the same price). Oddly, there are 3 different racks.
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Old 07-06-2008, 01:58 PM   #3
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Default Re: Power steering pump - EVO or not?

Check to see if there is a 2 wire connector going to your P/S pump. Standing at the passenger fender looking at the engine it will be behind the pump going towards the bottom of it. If the 2 wire connector is plugged into your pump, you have EVO. If it isn't, you don't.
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Old 07-06-2008, 02:12 PM   #4
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Default Re: Power steering pump - EVO or not?

thanks guys!
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Old 07-07-2008, 01:06 PM   #5
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1996 SW2
Default Re: Power steering pump - EVO or not?

EVO variable-assist steering was a feature of the DOHC cars (SC, SC2, SL2, SW2), so yes, yours should be EVO.
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Old 07-07-2008, 05:38 PM   #6
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Default Re: Power steering pump - EVO or not?

Quote:
Originally Posted by madpogue View Post
EVO variable-assist steering was a feature of the DOHC cars (SC, SC2, SL2, SW2), so yes, yours should be EVO.
Lemme tell you from experience, it doesn't always work that way. Best bet is to look at your particular car rather than try to blanket them all in together.
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Old 07-07-2008, 10:32 PM   #7
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Default Re: Power steering pump - EVO or not?

Mine is a 1997 SL, there are no wires going to the PS pump, so it's just regular PS. (PS was a free option when I bought the car).
So, it is non-variable ratio, right?
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Old 07-07-2008, 10:53 PM   #8
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Default Re: Power steering pump - EVO or not?

Quote:
Originally Posted by MikeNW View Post
Mine is a 1997 SL, there are no wires going to the PS pump, so it's just regular PS. (PS was a free option when I bought the car).
So, it is non-variable ratio, right?
Correct, non EVO.
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Old 07-08-2008, 05:56 AM   #9
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Default Re: Power steering pump - EVO or not?

Quote:
Originally Posted by Squareback View Post
Lemme tell you from experience, it doesn't always work that way. Best bet is to look at your particular car rather than try to blanket them all in together.
I'm sure some EVO pumps went into SOHC cars, but if they put non-EVO pumps in DOHC cars, they opened themselves up to fraud action, in that their buyers specifically paid for variable-assist steering. Did Saturn have to settle with any buyers so "corned"?
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Old 07-09-2008, 06:58 PM   #10
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Default Re: Power steering pump - EVO or not?

i got underneath the car and saw some type of connector on the bottom of the pump. with very limited visibility, i could not tell if it was a 1-wire or 2-wire, but there IS a connector there. is it possible its a 1-wire or is it safe to say the pump IS an EVO?
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Old 07-09-2008, 07:28 PM   #11
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1998 SC2
Default Re: Power steering pump - EVO or not?

The EVO is 2 wires and I have never heard of only 1 wire going to the pump. Sounds like you have an EVO pump.
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Old 07-09-2008, 07:46 PM   #12
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Default Re: Power steering pump - EVO or not?

thanks
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Old 03-06-2013, 07:38 PM   #13
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Dizzy Re: Power steering pump - EVO or not?

I have a 2001 SL2 and need to replace the power steering pump. Is it okay to change it out with a pump that has the variable assist but not the EVO option since it has the EVO option on the current pump? Will this cause a problem for the on board diagnostics? In other words if I do, will the check engine light come on and stay on?
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Old 03-06-2013, 08:44 PM   #14
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Default Re: Power steering pump - EVO or not?

Variable assist = EVO
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Old 11-13-2013, 01:38 AM   #15
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Default Re: Power steering pump - EVO or not?

Hey all. I am hoping it is OK to ask my question here since it is regarding an EVO Sensor. Yesterday, my buddy installed a new Power Steering Pump in my 1993 Saturn SL2 (Dual Cam). For some reason, the Pump did not come with an EVO Sensor. All the parts stores and the local Saturn/Chevy dealer have told me that the part has been discontinued. The parts guy basically told me that I would be OK without it but to install one if I can find one. So far, I cannot notice any problems but does anyone know how important this part is? If important, does anyone know where I might find such a part? So far, my search has come up empty. Thanks. Bob
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Old 11-13-2013, 01:50 AM   #16
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Default Re: Power steering pump - EVO or not?

Anybody else want to raise this thread from the dead?

You're fine without it. It is just a solenoid that limits the steering assist at higher speeds. I don't think any codes will be set either.
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Old 11-13-2013, 09:54 AM   #17
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Default Re: Power steering pump - EVO or not?

Thanks Anmasher. That is what I was hoping you would say.
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Old 02-16-2016, 01:07 AM   #18
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Default Re: Power steering pump - EVO or not?

I bought a PS pump for my 2000 SL2 <Auto Zone> and it was NOT EVO... however i took the EVO unit off my old pump and placed it on the new one. I discussed this with the guy at AZ first and agreed that it should be good. So, for future reference I believe you can take if off the old pump without much difficulty.
You will have to remove the bottom fitting of course, but so far, so good.
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Old 02-17-2016, 02:58 PM   #19
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Default Re: Power steering pump - EVO or not?

Not to hijack but it think this may be relevant;
I have noticed on my 98 SC2 that the steering feels "mushy" and it feels like I have to turn the wheel a bit further than I should for a turn especially at low speeds like backing out of the driveway for example.
It seems that I have to turn the wheel 1/4 turn when on any other car it would only be 1/8 for the same amount of turn, but I can tell that the power is still working, it's not like the pump died.
My front suspension was all replaced during my rebuild, with the addition of lowering springs in the front only, and as far as i know my steering rack and pump are original.
After reading this thread it made me wonder could it be that the EVO portion on the pump has failed?
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Old 02-17-2016, 05:07 PM   #20
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Default Re: Power steering pump - EVO or not?

Quote:
Originally Posted by Jeeprz! View Post
Not to hijack but it think this may be relevant;
I have noticed on my 98 SC2 that the steering feels "mushy" and it feels like I have to turn the wheel a bit further than I should for a turn especially at low speeds like backing out of the driveway for example.
It seems that I have to turn the wheel 1/4 turn when on any other car it would only be 1/8 for the same amount of turn, but I can tell that the power is still working, it's not like the pump died.
My front suspension was all replaced during my rebuild, with the addition of lowering springs in the front only, and as far as i know my steering rack and pump are original.
After reading this thread it made me wonder could it be that the EVO portion on the pump has failed?
The way you describe it, No. EVO is variable effort. The amount you turn the wheel doesn't change. The amount of force required to turn the wheel changes. IIRC, it only has an effect at speeds below 30mph.
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