ECT vs Temp sending unit
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Junior User
Joined: Mar 2003
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From: Arizona
ECT vs Temp sending unit
I have a new coolant leak on my 351w. It appears to be the ECT. I have pix but cannot post attachments. (why?) I'll try to post them in my garage. There is a 1/4" hose connected to the side which has rusted off, thus the leak. Is this the ECT? Thanks
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Junior User
Joined: Mar 2003
Posts: 53
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From: Arizona
Thread Starter
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Junior User
Joined: Mar 2003
Posts: 53
Likes: 0
From: Arizona
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
If the hose barb has broken off in the fitting, it is going to be difficult. You won't have heat but you can block the hose and seal the hole in the fitting if you can get a plug to thread into it. However, if you can get that done, you can replace the hose barb and fix it permanently. I'll caution against sealers used in such close proximity to the ECT sensor as if they coat the sensor the sensor may fail. And a failed ECT sensor will wreak all sorts of havoc on the system... everything from hard starts to severely reduced fuel economy.
Senior User
Joined: Apr 2004
Posts: 443
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From: Central Va.
Basic Ford part # for fitting is 18599 or 18A568(probally this one),I would get them(Ford) to order a new one BUT it can be found at a "you service salvage yard", looks the same as one on my 95 5.8 Bronco. Temp repair!! Remove the fitting (after removing ect aka engine cooling temperture sensor).The ECT will screw into threaded hole that coolant tree just came out of, block off coolant line temporarly untill you get a replacement coolant tree fitting. Water hose only goes to throttle body to heat it up(deice)which after thinking about it cooler air makes more horsepower so unless you live where it stays very cold you may just try leaving it off!!! Good Luck Blue
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Senior User
Joined: Apr 2004
Posts: 443
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From: Central Va.
DON'T TRY TEMP REPAIR--Brain mafunction- I forgot about heater hose is there also. Sorry 32 years in Ford Service Dept will do that to you!!!! Regards Blue
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From: Oshawa
help me please..can't figure out how to start thread.....I did a 4.6 2003 truck con vertion in the driveway 
the 5.4 is running and driveable....horrible fuel mileage....the ect/cht it a major issue I have at the moment, the old 4.6 I seem to remember the intake having the hose like system to the throttle body, the new system is the ect elec plug into the intake....tryin to wire it into yhe system because i think thats causing major fuel air mixture problems.....misfires like crasy at 1500rpm while driving....sees to be super ******* and can't pull its own *** around. all 8 are firing. codes are......po: 113, 1289, 123, 1000, 1125, 301, 303, 307, 316. since cleared not really getting service engine light again lately yet still misses and dogs....suggestions thanks ahead of time, come from a chev family of mechanics giving me a tough shoulder!!
the 5.4 is running and driveable....horrible fuel mileage....the ect/cht it a major issue I have at the moment, the old 4.6 I seem to remember the intake having the hose like system to the throttle body, the new system is the ect elec plug into the intake....tryin to wire it into yhe system because i think thats causing major fuel air mixture problems.....misfires like crasy at 1500rpm while driving....sees to be super ******* and can't pull its own *** around. all 8 are firing. codes are......po: 113, 1289, 123, 1000, 1125, 301, 303, 307, 316. since cleared not really getting service engine light again lately yet still misses and dogs....suggestions thanks ahead of time, come from a chev family of mechanics giving me a tough shoulder!!
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F150Lariat79
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