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Old 08-12-2009, 17:20   #1 (permalink)
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speed sensitive steering problem

My 99 Grand marquis has 'heavy-low pressure' steering at all speeds. I just learned it has speed sensitive steering. Is there a common failure I can look for? I have read if the electrics fail the system defaults to full pressure? I could live with that. What is EVO? Thanks for any ideas, Bob
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Old 08-12-2009, 20:36   #2 (permalink)
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Re: speed sensitive steering problem

This is the wiring diagram for the system. I don't know about any common failures. Maybe the sensor is a problem. What do you mean by 'heavy-low pressure' steering at all speeds?

EVO is Electronic variable orifice (EVO) actuator
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Old 08-12-2009, 20:38   #3 (permalink)
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Re: speed sensitive steering problem

Forgot the diagram.
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File Type: jpg Steering.jpg (142.9 KB, 15 views)
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Old 08-13-2009, 03:47   #4 (permalink)
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Re: speed sensitive steering problem

Thanks for the diagram. I mean the steering pressure seems low, and too much effort is needed to steer the car at all times. If it were a large truck I would think I had a stiff king pin. I was wondering if pumps failed alot, or is the actuator a common problem. Do you know about the default going to full pressure if, say the plug was pulled from the pump?
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Old 08-13-2009, 14:41   #5 (permalink)
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Re: speed sensitive steering problem

Yes, default is full assist. Try unplugging the EVO valve connector just above the oil filter. It swivels on the PS pump fitting.
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Old 08-13-2009, 16:56   #6 (permalink)
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Re: speed sensitive steering problem

Thanks Steve that was where I was going next. I've read the 'sticky' above on changing steer pumps. If pulling the connector makes no change, I guess that's my next move. Thanks for the help Guys, Bob.
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Old 08-19-2009, 17:42   #7 (permalink)
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Re: speed sensitive steering problem

After pulling the EVO connector and getting no change I swapped out pumps today. The rebuilt pump had an oily box, but the counterman assured me it was not a returned pump. While driving I feel the car has better steering pressure, but as I pulled into the lot to return my core I had no pressure! Reservoir is full, and I'm sure I got the air out. Damn It!! I can get another pump tomorrow from another location, but I was thinking of going with the 'fleet-taxi-police' pump that has no EVO port. Any thoughts? Thanks, Bob
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Old 08-19-2009, 17:55   #8 (permalink)
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Re: speed sensitive steering problem

I'd stay with the EVO pump. Will the first parts store give you your money back? Maybe they'll give you another pump that hasn't been used.
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Old 08-19-2009, 18:24   #9 (permalink)
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Re: speed sensitive steering problem

Oh sure, the pump is warrantied. I'd just have to pull it and take it to another store (A-Zone) for a replacement. Why stay with the EVO? Is there a pressure difference? I would prefer higher than lower.
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Old 08-19-2009, 21:16   #10 (permalink)
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Re: speed sensitive steering problem

When it's working it really is better. Here's a little information mentioning GM but all EVOs work the same. Steering
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