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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150



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  #101  
Old October 18th, 2018, 10:03 AM
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Took the truck for a ride to the nearest station that sells ethanol free gas, truck ran great on the way there. When I started it back up at the pump, the oil pressure hovered around 40psi. It would climb as I accelerated, but would drop back down at idle. Truck ran flawlessly otherwise. When I got back home, I popped the hood with it running to see what the fuel pressure looked like and to see if the oil line may have had an air bubble in it. All looked good. Did notice the upper radiator hose was still empty. It has a brand new thermostat in it. I would think after 15 minutes of driving, it would have been to temperature. It is a marine motor, so I looked up the stock thermostat for it, which is only 142 deg. So my question is, has anyone experienced an oil pump lose pressure because of temperature? I do realize these 2 events may be completely unrelated. Just trying to think of all possibilities and whether I need to be concerned.
  #102  
Old October 18th, 2018, 01:06 PM
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You need to put a 180 or higher thermostat in it. You should also pressure test the radiator cap. What weight oil are you using? What is your idle speed? A Ford Windsor V8 is fine if the oil pressure at idle is at least 10 psi.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #103  
Old October 18th, 2018, 02:01 PM
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I put a 190 in it, along with a brand new radiator cap. I put 15w40 in it because of the marine specs. That's what Mastercraft recommends. The idle does vary at times. When I first start it, it idles around 1000rpm. But when I run it and turn it off, then turn it back on, it idles a round 800rpm. Sometimes when I'm slowing down to stop, the idle doesn't come down below 1200rpm, but not too often. I know I'm just being a little paranoid since I just got it back on the road.
  #104  
Old October 18th, 2018, 04:31 PM
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What is the warm oil pressure at 800 rpm?

15W40 should be fine in your climate.

If the idle speed seems to be sticking, 2 things to check - make sure the linkage isn't binding somewhere between the pedal and the throttle body, and you may want to clean out the IAC. Pull it, spray it out with WD-40 and work the plunger with a small screwdriver till it moves freely and easily.

1000 is about right on a cold start, but the warm idle should probably be less than 800. Have you checked the ignition timing?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #105  
Old October 19th, 2018, 08:28 AM
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I haven't driven it for more then 10 minutes at a time yet. I'll do that over the weekend and check the pressure. I kinda thought it might go down some when the oil warms and thins out a little. I haven't checked timing. I don't have a timing light. I'll try to get to my grandpa's one day and have him check it with me. What do you recommend for the right amount of timing?
  #106  
Old October 19th, 2018, 10:19 AM
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The book calls for 10 BTDC with the SPOUT connector removed.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #107  
Old October 23rd, 2018, 10:49 AM
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Didn't get the timing checked. What is the SPOUT connector? Did take it on 120 mile round trip this weekend. Truck ran 2100 rpm at 65 mph. The only issue I'm having is over fueling. The electric fuel pump is on when the key is on. The regulator I have can't keep it dialed down. I drive for a couple of miles with the key in the ACC position and then turn it to on for about 5 seconds to let it fill the lines again. I'm thinking of getting another regulator to put in line and between the 2 it should be able to keep the pressure down. If that doesn't do it, then I'll drop the tank and remove the electric pump, install a pick up, and run some low pressure fuel line, and just the mechanical pump. All in all, I'm happy to have a truck on the road again.
  #108  
Old October 23rd, 2018, 12:35 PM
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http://www.merkurencyclopedia.com/EEC-IV/spout.html


2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #109  
Old October 23rd, 2018, 01:26 PM
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Not sure I need to worry about that thing. I'm using a point's distributor. But I've always wondered what that little gem did.
  #110  
Old October 23rd, 2018, 02:59 PM
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Points with or without vacuum advance?

Base timing is 10 BTDC with vacuum advance off and plugged. You can power tune it, advance it till you get spark knock, then back it off a bit. Don't exceed 16 BTDC.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS


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