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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

P.S.P. Switch?

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Old Jun 1, 2004 | 01:01 AM
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Question P.S.P. Switch?

Got a 521 trouble code and found some unplugged wires,but cain't find no switch! Whered that there thang go?
 
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Old Jun 1, 2004 | 12:25 PM
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Still looking!
 
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Old Jun 1, 2004 | 05:45 PM
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It should be in the high pressure line, where the rubber hose joins the metal tubing going into the steering box.
 
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Old Jun 1, 2004 | 08:50 PM
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Talking Thanks!

Is there supposed to be an external connection or anyting that would shut the truck down and show the 521 trouble code?
 
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Old Jun 1, 2004 | 09:04 PM
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It shouldn't shut the truck down, but it might let the idle speed drop when you turn the steering wheel. There should be a plug on the pressure hose.
 
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Old Jun 2, 2004 | 08:23 PM
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It shouldn't shut the truck down, but it might let the idle speed drop when you turn the steering wheel.
My switch is AWOL, but I never have codes. The only time I stalled it was in a freshly plowed field, sitting at idle, and cranking it to lock.
 
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Old Jun 3, 2004 | 06:22 PM
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The switch is only on 5.0's as far as I know, and I saw somewhere that if the 302 was mated to an E4OD, it wouldn't use a PSPS.
 
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Old Jun 4, 2004 | 02:07 PM
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Question PSP Mystery

I haven't found anything yet but will finally be spending more time this weekend trying to get the truck going(4.9 motor).I have been busy with other things but need to get to the bottom of this and figure out what is wrong.When I push the clutch in and run the code check I get a 111 code which I believe is "system pass".I also have a mystery 2 wire lead that is near the steering box but I cannot find where it lands,it is clean to a point as if it had been plugged into something but I have not been able to find what.I checked an "electric parts locator" book(for 94 veh.) at the library yesterday and it says only the early 94's (my truck has 5/94 manu. date)had the PSP switch in the line but does not say where the location is on the newer models.
 
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Old Jun 4, 2004 | 03:41 PM
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It would be in the same place, but I don't think you will find one - I'm pretty sure PSPS was only used on the 5 liter trucks.
 
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Old Jun 5, 2004 | 12:57 AM
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I found a nice,clean 96 model at a local Dodge dealer today,both mystery wires were for factory A/C compressor.I am changing cam gears as I originally thought the truck had jumped time and quit due to that but now am not sure.Had decided to check trouble codes and got off on this tack.The timing seems to be OK but i have heard that it can slip on the cam gear where the steel collar and fiber ring portion join so I am changing it as a precaution.
 
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Old Jun 5, 2004 | 09:39 AM
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Originally Posted by EPNCSU2006
It would be in the same place, but I don't think you will find one - I'm pretty sure PSPS was only used on the 5 liter trucks.
The PSP was used on the 300's (I refuse to use metrics!)from 87-90 or 91. My 87 had one, my nephews 87 has one but my bro-in laws 92 and my 93 don't.

Oh and please don't confuse us 6 BANGERS with those BENT 8's when you use the term 5 liter trucks. My truck cringes when anyone mentions "V" anything within hearing range.

4.916L = 300CID
4.949L = 302CID

They are so close as to DEFY convention. .033L difference. or 1.11 Fluid oz.


Larry
 
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Old Jun 5, 2004 | 10:23 AM
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Well whatever you call it, 302 or 5.0, they had psps, but I didn't know about the earlier 300's or 4.9's or whatever you want to call them. No where did I confuse the six and the V8. I know technically the 302 is a 4.9, but everyone knows what a 5.0 is. By the way, what is your fear of metrics? Seems every other bolt on my truck is metric. I'm sure your truck really cares about what people say.
 

Last edited by EPNCSU2006; Jun 5, 2004 at 10:33 AM.
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Old Jun 6, 2004 | 07:37 AM
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I wasn't calling you out on whether the 302 had a psp, I was denoting the fact that the 300 and the 302 have darn near the same specs with regard to size.

I'm old school where you could fix d@#% near anything on a domestic car/truck with 2-3 wrenches...1/2"...9/16....13/16 and a couple of screwdrivers. Now you have to have 2-3 times the number of wrenches, sockets etc..just to change plugs. I have 3 carry tool bags now, 1 for the truck(mixed), one for my wife's Pontiac (all Metric) and one for my boat(all standard and it's a 96'). Gets to be a pain in the @#$ trying to figure out what size a bolt is anymore. Used to be you could look at a Stovebolt six and tell right away the head bolts were 5/8"...Valve covers were 7/16" and almost everything else was either 1/2" or 9/16" Same with a 170 or 200 6Cyl.

Just once I'd like to get my hands on some of the "engineers" who design these vehicles and let THEM pull their hair out trying to figure out what wrench to use, or try and figure out why the starter won't come out without dis assembling 1/2 the engine..........

No flame intended.
 
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Old Jun 6, 2004 | 03:39 PM
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I agree with you there about having to have 50 different sized wrenches to do one job. I don't mind either which way they decide to go - metric or standard, just pick one and stick with it. Sorry that I misunderstood your other post.
 
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