302 overheating (indicated anyway)
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302 overheating (indicated anyway)
I posted this in the engines forum, but little help there. notice the wire to the sending unit is currently disconnected but i am still having the problem.
I have an EFI 302 in a 85 F-150 that shows a fluctuating temperature gague. I have changed the thermostat and the sending unit for the gague but still have the problem. I noticed when i changed the sending unit that the wire going to it was frayed and bare , so i wrapped it with electrical tape and replaced. Still had the problem. Then i removed the lead to the sending unit and still have a gague that bounces around.
Question is: Is this caused by the bare wire or is there another sensor somewhere that i don't know about?
BTW, the engine seems to be running at a normal temperature, i can touch the valve covers and the EFI when the gague reads hot with a bare hand.
I have an EFI 302 in a 85 F-150 that shows a fluctuating temperature gague. I have changed the thermostat and the sending unit for the gague but still have the problem. I noticed when i changed the sending unit that the wire going to it was frayed and bare , so i wrapped it with electrical tape and replaced. Still had the problem. Then i removed the lead to the sending unit and still have a gague that bounces around.
Question is: Is this caused by the bare wire or is there another sensor somewhere that i don't know about?
BTW, the engine seems to be running at a normal temperature, i can touch the valve covers and the EFI when the gague reads hot with a bare hand.
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
It may be your gauge in the dash. Turn your key forward and get the wire that hooks onto the sending unit and ground it. Hold it for about 5 seconds then run and look at your gauge. Or even better get someone to watch it while your ground it. If it goes all the way to hot your gauge is fine. If it bounces around or doesn't go to hot then your in dash gauge is shot.
Good luck.
-Matt
P.S. Don't ground the wire for too long. If you do then you could wreck a gauge that is in good condition.
Good luck.
-Matt
P.S. Don't ground the wire for too long. If you do then you could wreck a gauge that is in good condition.
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
OK, let us know how it turns out.
I was also just thinking that maybe that bare wire has something to do with it. If your gauge is fine then maybe you need to replace the bad section of that wire. Just a thought.....
-Matt
I was also just thinking that maybe that bare wire has something to do with it. If your gauge is fine then maybe you need to replace the bad section of that wire. Just a thought.....
-Matt
Posting Guru
Joined: Dec 2000
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From: Racine WI
I would try a mech gauge after the gauge ground test
Does the heat work normal? Heats not going in and out like a blown headgasket is it ?
There is a coolant temp sensor and a coolant temp sender on efi vehicles but it sounds like you already replaced the correct single wire piece part
I'll hope ya aint got a blown hg
Does the heat work normal? Heats not going in and out like a blown headgasket is it ?
There is a coolant temp sensor and a coolant temp sender on efi vehicles but it sounds like you already replaced the correct single wire piece part
I'll hope ya aint got a blown hg
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you know, i forgot to check the gauge. B/c I had the wire off the sending unit and i still had the problem i figured it was either in the gauge or the wire, and either way it doesn't seem to be too big of a problem, just have to remeber to check the fluid level every once in a while to make sure i'm not using any.
BTW, If i had the h.g. problem, i would be using some fluid right?
adn also, would i be getting it in the oil?
BTW, If i had the h.g. problem, i would be using some fluid right?
adn also, would i be getting it in the oil?
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This method also works for testing the oil pressure guage. when the lead is grounded, the guage should read full. if it doesn't, then the guage is bad. If it does, then a bare wire bouncing around and touching ground from time to time can cause the guage to bounce around.
Senior User
Joined: Jul 2003
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From: North of Toronto, Ontario
This method also works for testing the oil pressure guage. when the lead is grounded, the guage should read full. if it doesn't, then the guage is bad. If it does, then a bare wire bouncing around and touching ground from time to time can cause the guage to bounce around.
Cargo Master
Joined: Oct 2003
Posts: 2,833
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From: Jefferson, Iowa
well, in the late 70's trucks, i know they had a moving gauge problem. Check the cab to frame ground, and the voltage regulator under the dash, they would go out and cause some weird stuff.
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