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Toyota P-steering question
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<blockquote data-quote="Trainwreckinseattle" data-source="post: 1238279" data-attributes="member: 18146"><p>On the EFI power steering pump there is a fitting with two 1/4 inch fittings sticking out. Carburated trucks didn't have them.</p><p></p><p>That fitting is a pressure valve. When you turn the wheel which applies extra pressure it pushes the valve open which causes a small vacuume leak from in front of, to behind the throttle body. This ups the idle by a small amount to aid in power steering function. This function only works with high steering effort like while parking. If the tires are rolling there is less pressure on the valve and it doesn't actuate. Almost all cars have this feature.</p><p></p><p>Simply plug off all 4 nipples and you are good :awesomework:</p><p></p><p></p><p>A lot of people don't realize that there is a difference between 81-88 or 89 4runner pumps and "new" bodystyle 89-95 pumps. The newer pumps have a larger high pressure orifice. I think I remember reading on pirate about drilling them out to gain power steering pressure. </p><p></p><p>I have a 93 pump on my 88 truck. Man it's nice, hardly any effort at all to turn the wheel.</p><p></p><p>This episode of tech time brought to you by,</p><p></p><p>Patrick</p></blockquote><p></p>
[QUOTE="Trainwreckinseattle, post: 1238279, member: 18146"] On the EFI power steering pump there is a fitting with two 1/4 inch fittings sticking out. Carburated trucks didn't have them. That fitting is a pressure valve. When you turn the wheel which applies extra pressure it pushes the valve open which causes a small vacuume leak from in front of, to behind the throttle body. This ups the idle by a small amount to aid in power steering function. This function only works with high steering effort like while parking. If the tires are rolling there is less pressure on the valve and it doesn't actuate. Almost all cars have this feature. Simply plug off all 4 nipples and you are good :awesomework: A lot of people don't realize that there is a difference between 81-88 or 89 4runner pumps and "new" bodystyle 89-95 pumps. The newer pumps have a larger high pressure orifice. I think I remember reading on pirate about drilling them out to gain power steering pressure. I have a 93 pump on my 88 truck. Man it's nice, hardly any effort at all to turn the wheel. This episode of tech time brought to you by, Patrick [/QUOTE]
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