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  1. Martynka

    2003 overheating?

    Thank you very much. Now I understand more about heating system. I have still cold air in rear but hear all time some knocking ( flap stuck probably ) I'll be back after checking few things.
  2. Martynka

    2003 overheating?

    I order it. Good idea, I can close valve and check how engine works. If overheating disaper it means that maybe vavum selenoid stuck... and my theory was good, but ow is middle of the night here and I will check it tomorrow. If I need to replace SV haven't idea how remove it without disasembly...
  3. Martynka

    2003 overheating?

    Hi here :) Yes, I have Fluke and can check it. Yes, as you remember I have in car Superchips F5 Flashpaq with gauges but have few more and FordSys too. Live data shows something like this : the same like gauge on dashboard https://www.youtube.com/watch?v=ivKqsGsIWRk&ab_channel=eMCZe I...
  4. Martynka

    2003 overheating?

    One reason more why in my opinion it is not a head gasket. Today was warmer, about 55 F. I started and completely cooled down engine few times. All time without overheating. The engine temperature gauge showed 3/4 and after few second dropped to half. Now is much colder and after start engine...
  5. Martynka

    2003 overheating?

    Ok, I found photo from my changing intake manifold gasket. Is it sensor at front right side near inlet to fifth cylinder ??
  6. Martynka

    2003 overheating?

    This one : ?? hmmmm... 3 years ago I removed intake because had some false air, if I know.... EDIT: I remeber that I had one or two times fault from this sensor on OBD tester. I thought sensor fault was because of overheating not overheating because of sensor fault.
  7. Martynka

    2003 overheating?

    One week ago I changed all spark plug. I did it because I was doing borescopy of the cylinders, it was dry everywhere. Engine runs smooth at start, stable on idle. I drove with computer connected to the ECU. No missfire. I checked exhaust, both pipe without smell of coolant, without humidity and...
  8. Martynka

    2003 overheating?

    Hi, I have the same problem. Overheating. I checked: - exhaust gas in coolant - tested few times with bleu test ( no exhaust gas in cooling system ) - changed thermostat ( two times, now I have 165F ) - changed water pump ( old was in good condition ) - changed visco clutch - changed heater...
  9. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    Yes, you can measure it with bypass.
  10. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    yes. only higher amps can burn relay. High amper means: - hard working pump - electrical short circuit
  11. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    It should be few amps at idlle, but better to check it when driving because current draw is changed by temp and fuel flow.
  12. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    Like this: https://www.youtube.com/shorts/dfzm3r8VyOw but use 20A multimetr. We don't know how your pump works before you measure it. Correct
  13. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    You need to find "dark green/yellow" wire. It is wire from relay to the Inertia Fuel Shut off switch and from switch to the pump. Because on junction box you have "few" wires and is not to easy located "dark green/yellow" one, the simpliest way to check fuel pump is use "Inertia Fuel Shut off...
  14. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    You can check it with engine off and broken relay. You need to bypass battery + with power supply for fuel pump. Now I don't have electric diagram but try to find.
  15. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    I use 30 amp relay because it is standard car relay ( normal size ). My fuel pump workf fine. Power consumption is lower than 20A. I wrote you why I think that it can be fuel pump... but first need to check current for pump, and soldering new relay on PCB.
  16. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    If you ask me - yes, it help and I use standard 30A relay, not "mini 20A" ( in my opinion 20A is overrated for this relay to work long time ) On my profile I have a question: "Hello. I was just curious why you think the problem is the fuel pump?" Because your relay is rated for 20A. Fuel pump...
  17. Martynka

    2003 Ford Expedition Fuel Pump Relay (R303) Damaged

    Hi, I'm new here but had the same problem few years ago. In my opinion problem is in your fuel pump. Probably it's start to be worn and electric engine need more power to rotate. You can measure amps on work ( if you know how and have minimum 20A multimeter ). I solved problem with this relay...

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