faris_jason Posted July 7, 2008 Report Share Posted July 7, 2008 Today my 2000 Deville DTS started jerking knot 3rd. There aren't any codes and the fluid looks good. Any suggestions for troubleshooting, or possible theories to what it could be? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 7, 2008 Report Share Posted July 7, 2008 Post what you mean again, you said, started jerking knot 3rd, explain.. You dont have a third gear shift? Its possible that your shift solenoid is starting to go or gone. Explain your post, thanks 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...
Cadillac Jim Posted July 7, 2008 Report Share Posted July 7, 2008 I would read the trouble codes. If one of your sensors is giving trouble, such as MAP, MAF or VSS. the transmission operation will go into an open-loop default mode and shift a little rough like a 1954 Hydramatic but the car will drive fine. Here's how to read the trouble codes: http://www.caddyinfo.com/readingcodes.html -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 7, 2008 Report Share Posted July 7, 2008 I would read the trouble codes. If one of your sensors is giving trouble, such as MAP, MAF or VSS. the transmission operation will go into an open-loop default mode and shift a little rough like a 1954 Hydramatic but the car will drive fine. Here's how to read the trouble codes: <a href="http://www.caddyinfo.com/readingcodes.html" target="_blank">http://www.caddyinfo.com/readingcodes.html</a> Jim, he posted that there were no codes. It is not clear if he is saying it won't shift past second. I have never had the shift solenoid problem so I can not speak from authority, but its important to get more detail of the symptoms Jeezy, I am too lazy to look back, but do a search under SHIFT SOLENOID there are two, and see if your symptoms are similar 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...
lothos Posted July 7, 2008 Report Share Posted July 7, 2008 I had the shift solenoid problem on a 1995 STS and mine threw codes. If I remember right, the car would drive fine until the car tried shifting to third gear. It would throw a code and not let me shift past second. At first I could turn off the car and clear the problem for a little while but my solenoids had to be replaced with the updated kit. WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn. Cheers! 5% discount code at RockAuto.com - click here for your discount! Link to comment Share on other sites More sharing options...
Cadillac Jim Posted July 7, 2008 Report Share Posted July 7, 2008 I'm thinking that there may be no codes displayed on the DIC while driving but there may be stored codes. Also, I'm wondering how there could be a sensor or transmission code without a MIF light, but hey, let's see what jeezy112 says. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
faris_jason Posted July 8, 2008 Author Report Share Posted July 8, 2008 There are no codes or any with a history either. What I meant by jerking into 3rd was around 30 mph it will jerk into that gear. Its not a smooth transition as the others. I just changed my throttle postion sensors a and b for a similar issue but the jerking would happen constantly and it would always throw codes for the jerking/ stalling. This new issue just came about, throws no codes and only happens around 30 mph which has me thinking transmission?!? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 8, 2008 Report Share Posted July 8, 2008 When you installed your throttle position sensor did you do a learn procedure? This is in the 2000 service manual. Disconnect the battery and do this, maybe this will help Perform the TP Sensor learn procedure: Turn the ignition to the RUN/ON position. Wait 1 minute. Turn the ignition to the LOCK/OFF position. Wait 15 seconds. 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...
faris_jason Posted July 8, 2008 Author Report Share Posted July 8, 2008 Sorry the sensors I changed were the crankshift position sensors. I had my mechanic do it due to a lack of time. I will try disconnecting my batt and try that procedure just to see if it works. Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 8, 2008 Report Share Posted July 8, 2008 I saw a and b and assumed you had the TPS and crank sensors replaced. I have looked through the manual and do not see anything on a rough 3rd gear shift. Is that your only symptom? What else has been done, has the tranny fluid been changed? 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...
faris_jason Posted July 9, 2008 Author Report Share Posted July 9, 2008 I have changed the throttle position sensor and both crankshift A and B within the last 6 months. I was driving yesterday and I put it in 1st, 2nd and 3rd to see if the problem was only when the car was in drive but it still jerked going into 3rd gear. Also still no codes. I'm going to disco the battery today and re program the PCM and also what you told me to do for the TPS. If all fails I will be taking her back in! Again! Also my tranny fluid is at the right level. Should I drain it and refill it with some new fluid? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 9, 2008 Report Share Posted July 9, 2008 Does this happen under all degrees of acceleration (slow, medium and hard acceleration) The TPS is very integrated into the tranny's shifting, the PCM utilizes it to set line pressure. If the PCM is seeing say 50% throttle angle when the throttle angle is 25%, the shifting will be harsh as the line pressure will be higher than necessary I would do the TPS learn Was this an OEM TPS or aftermarket? Check to see that the TPS is secure. I do not believe there is an adjustment See this on Harsh Shifts, have you actually checked for codes or are you assuming there are no codes because of no CEL? I would expect 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...
faris_jason Posted July 9, 2008 Author Report Share Posted July 9, 2008 Yes it happens at all degrees of acceleration. Sometimes when I accelerate extremely slow it does not happen! The TPS is OEM but my cranshaft sensors are after market. Im saying there are no codes beacause none are pulling up on my DIC. Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 9, 2008 Report Share Posted July 9, 2008 Did you recently clean your throttle body or have it cleaned? Disconnect the battery and leave it off for about 5 minutes, and do the TPS learn on reconnect. Explain, non are pulling up on our DIC. Are YOU, calling the codes up, OR, are you assuming there are no codes because you have not seen a text message across your DIC? How many miles on the car? When was the tranny fluid changed last? Check your coolant to see if you are losing coolant (tranny cooler is in the radiator). Pull the tranny stick and see if you are foaming. 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...
faris_jason Posted July 9, 2008 Author Report Share Posted July 9, 2008 Thanks for all of your help. Im not that great with cars. I am an aircraft electrician so I am pretty handy and if taught can probably learn any system. I haven't cleaned my throttle body unless they did it when I got my tune up about 2 months ago. I have called the codes up but there is none. I have about 105000 miles on her. I personally haven't changed the tranny fluid since I have had her because it looks good and had always been at level. Can you tell me the proper way I should check? The last two weeks I have been having to add coolant weekly. I wasn't aware that the tranny used the coolant system. Do you think that could cause the jerking? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 9, 2008 Report Share Posted July 9, 2008 Thanks for all of your help. Im not that great with cars. I am an aircraft electrician so I am pretty handy and if taught can probably learn any system. I haven't cleaned my throttle body unless they did it when I got my tune up about 2 months ago. I have called the codes up but there is none. I have about 105000 miles on her. I personally haven't changed the tranny fluid since I have had her because it looks good and had always been at level. Can you tell me the proper way I should check? The last two weeks I have been having to add coolant weekly. I wasn't aware that the tranny used the coolant system. Do you think that could cause the jerking? Having to add coolant is not good, do you have a leak? How has your temp been? How much coolant have you been having to add?, are you getting the COOLANT LOW message? The tranny dip stick is under the air filter plumbing that goes to the throttle body, see this photo, twist the stick off and check the level, look at the color, look for foam, etc. If you look at the right side of the radiator, you will notice two tubing connections, that is the tranny cooler lines, if the cooler in the tranny is leaking,..well lets not go there. See my post #3 in this photo for the location of the tranny dip stick http://caddyinfo.ipbhost.com/index.php?showtopic=18139 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...
faris_jason Posted July 9, 2008 Author Report Share Posted July 9, 2008 Dont know if I have a leak. This just started recently but I have always had to add coolant here or there. My temp is fine, no overheating. I do get the coolant low warning and I have to add an inch or so of coolant to get my level to where it needs to be. When I check my fluid should it be after I have driven the vehicle and should I cyle through all the gears. You know from reverse, 1st, 2nd, drive and etc.......? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 9, 2008 Report Share Posted July 9, 2008 Dont know if I have a leak. This just started recently but I have always had to add coolant here or there. My temp is fine, no overheating. I do get the coolant low warning and I have to add an inch or so of coolant to get my level to where it needs to be. When I check my fluid should it be after I have driven the vehicle and should I cyle through all the gears. You know from reverse, 1st, 2nd, drive and etc.......? You will see marks on the stick for cold and hot I believe. Just put it on a level surface with the engine running. I am more concerned with whether or not you are getting coolant in your tranny.. Look closely at your fluid... 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...
faris_jason Posted July 9, 2008 Author Report Share Posted July 9, 2008 I got home disco'd the batt and reprogrammed both the PCM and TPS. Also checked tranny fluid and it was level and had a few bubbles. Didn't smell burnt but did seem dark. So I dropped of my baby at the shop. Mechanic said if they don't find anything possibly flush the tranny fluid. I know I have seen on here several times not to flush, but just drain and refill. Is this recommended or should I just flush the system out? He is also going to check the sensors despite no codes. Also told him to check all of my coolant systems. Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 9, 2008 Report Share Posted July 9, 2008 I got home disco'd the batt and reprogrammed both the PCM and TPS. Also checked tranny fluid and it was level and had a few bubbles. Didn't smell burnt but did seem dark. So I dropped of my baby at the shop. Mechanic said if they don't find anything possibly flush the tranny fluid. I know I have seen on here several times not to flush, but just drain and refill. Is this recommended or should I just flush the system out? He is also going to check the sensors despite no codes. Also told him to check all of my coolant systems. NO, DO NOT FLUSH THE TRANNY, CALL THEM NOW, STOP THEM 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...
lothos Posted July 9, 2008 Report Share Posted July 9, 2008 Never flush the transmission. Ever. EDIT: HAHA, I like BBF's reply WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn. Cheers! 5% discount code at RockAuto.com - click here for your discount! Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 9, 2008 Report Share Posted July 9, 2008 ONLY drop the pan, clean out the pan, put on a new SEAL, not cork... Inspect the pan for unusual debris and tained fluid. That is all. AND, we don't care if they cant drain all of the fluid.... don't worry about that when then say that. BUT, don't flush We can direct YOU how to exchange the fluid if you want, you do it by opening the return on the cooler, and directing the fluid into a bucket, if you want to try that idea. But using a machine to flush it is DANGEROUS 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...
Texas Jim Posted July 10, 2008 Report Share Posted July 10, 2008 You flush a toilet.... NOT a transmission. Link to comment Share on other sites More sharing options...
faris_jason Posted July 10, 2008 Author Report Share Posted July 10, 2008 I haven't told them to do anything yet. They will call me tomorrow to let me know if they found anything. Thanks for your help. Matter of fact I will post when they said they found and you guys can tell me if it sounds right or not. Link to comment Share on other sites More sharing options...
faris_jason Posted July 10, 2008 Author Report Share Posted July 10, 2008 Mechanic couldn't find anything wrong so I dropped it off at a supposedly reputable tranny shop. But he did say my coolant cap needed to be replaced and thats why my coolant level has been low the last couple of weeks. Ill keep you informed on what the tranny mech says's tomorrow. Link to comment Share on other sites More sharing options...
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