Overdrive chatter, temp sensor location
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Overdrive chatter, temp sensor location
I have a just rebuilt transmission in my 2003 e350 diesel 7.3 bus/camper conversion. The tranny (4r100) chatters when it goes into overdrive. The rebuilder is 650 miles from here, so I have had it to four different local shops and each has a different diagnosis. The Ford dealer says it is a fuel restriction in the tank ($300 to drop the tank and look), but it runs great and hits 80mph with no fuel starving evident. Other diagnoses are about this silly (residual assembly grease, bad computer, etc). I have checked all the sensor circuits I can find, so I am going to throw parts at it. Since the chatter is worse when the bus heats up, I bought a tranny fluid temp sensor ($15), but I can't find the location on the tranny. I also have a solenoid rack ordered, so the pan has been dropped. Any advice welcome.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
The temp sensor is on the solenoid body. I doubt that's your problem.
Chatter is usually the torque converter clutch. Either the torque converter is bad or the wrong ATF is in the trans which can cause a shudder.
Chatter is usually the torque converter clutch. Either the torque converter is bad or the wrong ATF is in the trans which can cause a shudder.
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Thanks for the reply. I may have the wrong temp sensor. I see nothing similar on the solenoid rack. It is plastic, about 1.5 inches long with a two-pin connector on one end and an o-ring on the other. I guess atf is tranny fluid. Would the torque converter shudder only when locking up in overdrive? When I disengage the overdrive, no shudder.
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tranny overdrive shudder
I understand this is an electronic transmission. The rebuilder says the turbine speed sensor circuit is responsible for the shudder. I have checked the circuit and it is ok. Now he says it is the pcm (not sending the tss signal to the torque converter). Do you have an opinion on this?
Frmr Ford Trans Engr
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Yes, and it doesn't agree with his opinion.
What ATF did you put it in? The wrong ATF can cause torque converter shudder. I suspect the shudder is worse hot because the ATF thins when it's hot. I don't think the temp sensor is causing this.
It could also be a bad torque converter clutch. It could be bad info from a sensor. The only way to diagnose this is with a good scan tool where you can monitor the data the PCM is seeing.
What ATF did you put it in? The wrong ATF can cause torque converter shudder. I suspect the shudder is worse hot because the ATF thins when it's hot. I don't think the temp sensor is causing this.
It could also be a bad torque converter clutch. It could be bad info from a sensor. The only way to diagnose this is with a good scan tool where you can monitor the data the PCM is seeing.
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