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2nd gen issues? Try this first!

allmyEXes

Explorer Addict
Joined
February 6, 2016
Messages
1,182
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360
Location
Lickskillet
City, State
No. Alabama USA
Year, Model & Trim Level
1997 Blue Ex 4.0 SOHC
Callsign
KAGG 3611 (CB)
@Raph X. That could be a wiring or ECT sensor issue. Correct me if I'm wrong but there are two sensors there. One for the gauge and one for the ECM. Also a stuck open thermostat could be keeping the engine too cool but I think thermostats stay closed when bad. However if the thermostat was defective I think at some point the engine and radiator would "heat build" during the hot time of the year. Are you using more fuel than you think that you should be? Is there a thermostat in the system or has someone previously removed it?
 
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cantornikolaos

Active Member
Joined
August 2, 2011
Messages
84
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5
Location
Greenville, SC
City, State
Greenville, SC
Year, Model & Trim Level
2000 Explorer Limited 5.0
Callsign
BigTime
The Trans connector was the cause of my alternator issues.

And very likely the cause of the all the codes, O2 sensors, I was getting.

So 2 O2 sensors, 2 coil packs, 1 alternator, about 30 hours, and a lot of swearing could probably have been avoided.

I found mine was loose while tracing back the green/red wire.

After separating the connector, I sprayed both pieces with MAF cleaner, it was sitting right there, let it dry then put it together and snugged the bolt up.

The alternator issue went away immediately, and all residual rough running smoothed right out.

Live and learn, remember Occam's Razor!
Where is the trans connector?
 
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MAS Tequila

Elite Explorer
Joined
October 6, 2013
Messages
619
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77
City, State
Boca Raton FL
Year, Model & Trim Level
2000 Mounty 4WD 5.0
01018F12-9452-48B6-A2CA-EA84D19DDF1E.jpeg

This is it, on the firewall.
 
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Balke

Member
Joined
August 12, 2019
Messages
40
Reaction score
3
City, State
Edmonton, alberta
Year, Model & Trim Level
2001 Sport Utility
@Raph X. That could be a wiring or ECT sensor issue. Correct me if I'm wrong but there are two sensors there. One for the gauge and one for the ECM. Also a stuck open thermostat could be keeping the engine too cool but I think thermostats stay closed when bad. However if the thermostat was defective I think at some point the engine and radiator would "heat build" during the hot time of the year. Are you using more fuel than you think that you should be? Is there a thermostat in the system or has someone previously removed it?
The new thermostat that i installed , will stay open when it goes bad . At least that is what the part info says.
 
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Jsck5466

Elite Explorer
Joined
October 26, 2020
Messages
19
Reaction score
2
City, State
Holtville ca
Year, Model & Trim Level
97 explorer limited AWD
Sometimes a gremlin can be caused by the smallest thing.

There are 2 large wire bundle connectors on the firewall. Both are held tight with a 10mm bolt.
Any bad connection in either plug can cause just about any issue. from bad transmission shifting, bad o2 sensor readings, no start, no power, etc.

Right above the HVAC blower motor is the PCM connector.
View attachment 98220
Above the intake manifold is a large square black connector. This is the main harness for everything electrical and transmission related from truck to main wire harness. Trans harness for short. It also has the 02 sensor wiring because they run down along the transmission.
View attachment 98221

since this cost nothing, and can cause a lot of issues, the first thing in your troubleshooting should be to loosen these connectors, look them over for bent or pushed back pins, and then if all looks good, re-seat them and tighten the bolt.

If this does not help you, well, keep digging in the forum for an answer.
If it does, please post in this thread so we can keep track.

Thanks, and good luck!
hello and i am a new member with issues concerning my ongoing attempt to finish my work on a 97 explorer AWD 4404 tc & 4r70w tranny. it started with a TC chain replacement .. got that done .. had a rear main issue so i replaced that.. when i finished putting tyranny back on and started it it threw 743 ,750, 765 codes yelkes! and the o/d off light is flashing !!! being a Dumb dumb i jumped right to it and replaced the tcc and shift solenoids .. filter.. and guess what the codes are still showing up .. So now any pacific thing anyone could point out to we're i should start with 1st.. electrical connections . glad i saw your write up thks and help please jack
 
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Balke

Member
Joined
August 12, 2019
Messages
40
Reaction score
3
City, State
Edmonton, alberta
Year, Model & Trim Level
2001 Sport Utility
hello and i am a new member with issues concerning my ongoing attempt to finish my work on a 97 explorer AWD 4404 tc & 4r70w tranny. it started with a TC chain replacement .. got that done .. had a rear main issue so i replaced that.. when i finished putting tyranny back on and started it it threw 743 ,750, 765 codes yelkes! and the o/d off light is flashing !!! being a Dumb dumb i jumped right to it and replaced the tcc and shift solenoids .. filter.. and guess what the codes are still showing up .. So now any pacific thing anyone could point out to we're i should start with 1st.. electrical connections . glad i saw your write up thks and help please jack
Ok , im not Mr. Joe Pro ,, but I do know that the ATRA ( Auto. Trans. Re builders Assoc. ) said that you should start with the power and grounds supplied to the computer . I dont know if the codes are the same for yur trany as they are for the 4r44e family , but if they are , then i have the material info for every code that there is .
 
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Jsck5466

Elite Explorer
Joined
October 26, 2020
Messages
19
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2
City, State
Holtville ca
Year, Model & Trim Level
97 explorer limited AWD
Ok , im not Mr. Joe Pro ,, but I do know that the ATRA ( Auto. Trans. Re builders Assoc. ) said that you should start with the power and grounds supplied to the computer . I dont know if the codes are the same for yur trany as they are for the 4r44e family , but if they are , then i have the material info for every code that there is .
10-4 much appreciated sir. i'll let u no how it goes
 
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Balke

Member
Joined
August 12, 2019
Messages
40
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3
City, State
Edmonton, alberta
Year, Model & Trim Level
2001 Sport Utility
ps does the overdrive button have issues
Im not sure , but it might . My O.D. Button sometimes does not work , all i have on that , is info in how to service , replace it , but nothing about how it may cause the light to flash . , Anyway , your light is most likely flashing because of the codes that are popping up , whether or not your codes relate to real malfunctions , or if it is the computer that is just thinking that .
P.S. , i have the flashing light from hell also , it is intermittent , and the code is a PO741 TCC stuck off , it is one of the most common problems and mind boggling .!! I did some stuff, and so far , my trany improved amazingly big time , but my light still flashes ,...intermittently . There are many different reasons for the PO741 .
 
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Raph X.

Member
Joined
October 5, 2020
Messages
41
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10
City, State
SACRAMENTO
Year, Model & Trim Level
2001, explorer sport.
@Raph X. That could be a wiring or ECT sensor issue. Correct me if I'm wrong but there are two sensors there. One for the gauge and one for the ECM. Also a stuck open thermostat could be keeping the engine too cool but I think thermostats stay closed when bad. However if the thermostat was defective I think at some point the engine and radiator would "heat build" during the hot time of the year. Are you using more fuel than you think that you should be? Is there a thermostat in the system or has someone previously removed it?

Sorry a year late. Have been buisy. Thermostat was the fault. I just kept second guessing myself. I swapped it and shes been great ever since. Thanks for the info.
 
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Mbrooks420

High Voltage.
Elite Explorer
Joined
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11,861
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Year, Model & Trim Level
1998 Mountaineer AWD
All thermostats are designed to fail open.
 
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dicksong

New Member
Joined
May 28, 2021
Messages
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City, State
Denver
Year, Model & Trim Level
98 XLT
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dicksong

New Member
Joined
May 28, 2021
Messages
6
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1
City, State
Denver
Year, Model & Trim Level
98 XLT
Sometimes a gremlin can be caused by the smallest thing.

There are 2 large wire bundle connectors on the firewall. Both are held tight with a 10mm bolt.
Any bad connection in either plug can cause just about any issue. from bad transmission shifting, bad o2 sensor readings, no start, no power, etc.

Right above the HVAC blower motor is the PCM connector.
View attachment 98220
Above the intake manifold is a large square black connector. This is the main harness for everything electrical and transmission related from truck to main wire harness. Trans harness for short. It also has the 02 sensor wiring because they run down along the transmission.
View attachment 98221

since this cost nothing, and can cause a lot of issues, the first thing in your troubleshooting should be to loosen these connectors, look them over for bent or pushed back pins, and then if all looks good, re-seat them and tighten the bolt.

If this does not help you, well, keep digging in the forum for an answer.
If it does, please post in this thread so we can keep track.

Thanks, and good luck!
How long should it take the CEL to come back on after doing this? removing the battery and/or these 2?
 
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Turdle

Lowrider
Staff member
Moderator
Elite Explorer
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29,723
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City, State
Humboldt, KS
Year, Model & Trim Level
2000 Mounty
How long should it take the CEL to come back on after doing this? removing the battery and/or these 2?
Could you please rephrase this? CEL should not come back on unless there is an issue so your question, the way it is worded has me confused. Which 2 what?
 
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