chadbobo Posted October 13, 2008 Report Share Posted October 13, 2008 I believe I have traced a drivability problem (jerking) to a bad tcc solenoid on my 92 Deville. If this solenoid is bad why would there not be a code '39' set on my computer? This lack of a code seems to be common on this vehicle. I do get codes on occassion and correct the problem but also have problems that set no code when I think they should. As with the tcc solenoid code not setting I have currently vacuumed the a/c system preparatory to converting to r134a refrigerant and no code yet in three days. Any comments? Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 13, 2008 Report Share Posted October 13, 2008 I believe I have traced a drivability problem (jerking) to a bad tcc solenoid on my 92 Deville. If this solenoid is bad why would there not be a code '39' set on my computer? This lack of a code seems to be common on this vehicle. I do get codes on occassion and correct the problem but also have problems that set no code when I think they should. As with the tcc solenoid code not setting I have currently vacuumed the a/c system preparatory to converting to r134a refrigerant and no code yet in three days. Any comments? Have you considered that the solenoid is doing its job and the converter is the problem? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
chadbobo Posted October 14, 2008 Author Report Share Posted October 14, 2008 I believe I have traced a drivability problem (jerking) to a bad tcc solenoid on my 92 Deville. If this solenoid is bad why would there not be a code '39' set on my computer? This lack of a code seems to be common on this vehicle. I do get codes on occassion and correct the problem but also have problems that set no code when I think they should. As with the tcc solenoid code not setting I have currently vacuumed the a/c system preparatory to converting to r134a refrigerant and no code yet in three days. Any comments? Have you considered that the solenoid is doing its job and the converter is the problem? You are probably right. This convertor was replaced at 125k and the 'jerking' started at 150k. Is there a definitive way to determine which it is without replacing one or the other? This 'jerking' has been going on intermittently for about 100k miles now. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 14, 2008 Report Share Posted October 14, 2008 I believe the solenoid can be diagnosed by a tech with with the right equipment, he can command it on and off to determine if it is functioning. Why was the converter replaced?, way the tranny rebuilt? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
chadbobo Posted October 14, 2008 Author Report Share Posted October 14, 2008 I believe the solenoid can be diagnosed by a tech with with the right equipment, he can command it on and off to determine if it is functioning. Why was the converter replaced?, way the tranny rebuilt? The fuse #5 in the right-hand under dash fuse center blew. This causes the trans to go into some sort of limp home mode(3rd gear only) and also kills the a/c. The diagnostic shop supposedly was familiar with the model of auto but mis-diagnosed the problem and rebuilt the trans. It lasted about 1/2 mile. They "fixed" it by tearing the weather connector out of the compressor so that later on I could not turn on the a/c and therefore the trans has worked fine for 9 years(except for the 'jerking'). Replacing the compressor and wiring to it still results in a blown fuse when it is turned on and the limp home mode in the trans. I think I should have sued them but anyway that is where I am. I cut the tan with black stripe wire this afternoon and the jerking is now gone but I am not sure I have more than 3 forward speeds. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 14, 2008 Report Share Posted October 14, 2008 I believe the solenoid can be diagnosed by a tech with with the right equipment, he can command it on and off to determine if it is functioning. Why was the converter replaced?, way the tranny rebuilt? The fuse #5 in the right-hand under dash fuse center blew. This causes the trans to go into some sort of limp home mode(3rd gear only) and also kills the a/c. The diagnostic shop supposedly was familiar with the model of auto but mis-diagnosed the problem and rebuilt the trans. It lasted about 1/2 mile. They "fixed" it by tearing the weather connector out of the compressor so that later on I could not turn on the a/c and therefore the trans has worked fine for 9 years(except for the 'jerking'). Replacing the compressor and wiring to it still results in a blown fuse when it is turned on and the limp home mode in the trans. I think I should have sued them but anyway that is where I am. I cut the tan with black stripe wire this afternoon and the jerking is now gone but I am not sure I have more than 3 forward speeds. Let me look at my manual and get back to you on this. I wonder if this electrical problem is causing your jerking Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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