BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 Nice Kevin, I had forgotten that you lost OD, let me find that thread: 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...
BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 Here is Kevin's 4th Servo thread, you gotta love this Ken, thanks Kevin http://caddyinfo.ipbhost.com/index.php?showtopic=11203 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...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 Thanks guys, Good read on the 4th gear servo piston assembly. I now have enough informaton to be dangerous !! Will let you know what we find. Link to comment Share on other sites More sharing options...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 My tranny checked out. The tranny shop drove the car where I have it drop out and it did it for him. He says there is nothing wrong with the tranny and that the computer is doing this. Told me to have the alternator checked says I'm only at 11.8 volts while driving. I know I have been as high as 13.8 at startup during the cold snap. and I think it stays at 12.8 while driving with lights and AC on which has been normal since I owned it. Changed the battery 2 weeks ago because it was 3 years old and giving me some hard starts. What do you guys think? Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 11.8 is definately low, it should never be below 12 while driving, if you recall the ammeters on cars, you would be showing a discharge. That could be why you are were having hard starts. Didn't you do an alternator recently or am I wrong? PS, glad the tranny is ok, as I noted, mine will downshift when the engine labors 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...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 Haven't changed the alternator and I'm not lookig forward to it. I'm going to take the car to Advanced Auto tonight or tomorrow to have the system tested. If the alternator is bad, Rock Auto has new AC Delco's for about $140. What I don't get is that I believe I run at 12.8 to 13.2 on the highway with AC, Headlights, Foglamps on . I guess one way to check is to try to maintain 70MPH displaying the voltage and see if it fluctuates. This is strange. Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 Haven't changed the alternator and I'm not lookig forward to it. I'm going to take the car to Advanced Auto tonight or tomorrow to have the system tested. If the alternator is bad, Rock Auto has new AC Delco's for about $140. What I don't get is that I believe I run at 12.8 to 13.2 on the highway with AC, Headlights, Foglamps on . I guess one way to check is to try to maintain 70MPH displaying the voltage and see if it fluctuates. This is strange. That is about what you should run 12.8 to 13.2 at all times. In the summer heat in heavy traffic with a load, I drop below 12, but its due to the heat. When did he see 11.8?, driving 70?, to me, that should never happen 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...
KHE Posted January 29, 2009 Report Share Posted January 29, 2009 Haven't changed the alternator and I'm not lookig forward to it. I'm going to take the car to Advanced Auto tonight or tomorrow to have the system tested. If the alternator is bad, Rock Auto has new AC Delco's for about $140. I probably sound like a broken record when I say this but... If your alternator is bad, have the existing alternator rebuilt by a local rebuilder. Much cheaper than a new alternator or even reman. junk from parts stores. I had the alternator shop in my area look at my Fleetwood's alternator last May - just for preventive maintenance and they installed new bearings, brushes, cleaned the case and painted the core laminatins - $68.50. Now I know it will be good for another 15 years... Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 I've never seen 11.8V on the highway but I haven't been looking recenty. If the alternator is dropping out I would expect to see lights flicker or get a voltage fault. Also by now if the alternator was dead with the defrosters and heater blowing in stop and go traffic, I would expect a dead battery by now with memory seat loss, AVG Miles, Fuel Used memories dropping out. It is the original alternator. Can the regualtor get intermitant or go into a low voltage charge only on an alternator? I thought an alterantor was a go-no go component. Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 I've never seen 11.8V on the highway but I haven't been looking recenty. If the alternator is dropping out I would expect to see lights flicker or get a voltage fault. Also by now if the alternator was dead with the defrosters and heater blowing in stop and go traffic, I would expect a dead battery by now with memory seat loss, AVG Miles, Fuel Used memories dropping out. It is the original alternator. Can the regualtor get intermitant or go into a low voltage charge only on an alternator? I thought an alterantor was a go-no go component. When did he see the 11.8 while it was sitting idling? If that is the case, I am not so concerned. 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...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 11.8V is at idle in the shop warm. I didn't think I had an alternator problem. His TSB's on the car says it needs to be 13.5 volts at all times. Its never been that. He did say the the computer is telling the tranmissoin that is at maximum speed and it needs to downshift. What tells the computer that? The IAC, ISS, VSS? Should I Disconnect the battery and do a relearn? I have not done it yet? Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 11.8V is at idle in the shop warm. I didn't think I had an alternator problem. His TSB's on the car says it needs to be 13.5 volts at all times. Its never been that. He did say the the computer is telling the tranmissoin that is at maximum speed and it needs to downshift. What tells the computer that? The IAC, ISS, VSS? Should I Disconnect the battery and do a relearn? I have not done it yet? Ken, I have some relavant info from a 4T80-E Technicians Guide, Ill scan it later, Mike 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...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 Great ! Link to comment Share on other sites More sharing options...
kens96 Posted January 29, 2009 Author Report Share Posted January 29, 2009 Just got home and checked the voltage readings . No headlights at idle in park 13.5 volts. Headlights at idle in park 12.5 volts. Head lights at idle in drive slowly drop below 12 volts Add fog lamps in drive we get to 11.8 Rev the engine and the alternator volts run up in to the high 12's to 13's volt area. I don't believe I have an alternator issue. Should I try a disconnect battery and relearn? Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 29, 2009 Report Share Posted January 29, 2009 Just got home and checked the voltage readings . No headlights at idle in park 13.5 volts. Headlights at idle in park 12.5 volts. Head lights at idle in drive slowly drop below 12 volts Add fog lamps in drive we get to 11.8 Rev the engine and the alternator volts run up in to the high 12's to 13's volt area. I don't believe I have an alternator issue. Should I try a disconnect battery and relearn? Your voltage readings look good. I have to find that charging primer that I posted a while back and post a link to it. You are fine. 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...
kens96 Posted January 30, 2009 Author Report Share Posted January 30, 2009 Is there an Idle Learn Procedure for a 96? I'm going to disconnect the battery and let is sit for awhile. I didn't do it after I cleaned the TB last week it started up and idled and drove fine. Don't know if the TPS is linked to shifts and maintaining highway speeds. Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 30, 2009 Report Share Posted January 30, 2009 Is there an Idle Learn Procedure for a 96? I'm going to disconnect the battery and let is sit for awhile. I didn't do it after I cleaned the TB last week it started up and idled and drove fine. Don't know if the TPS is linked to shifts and maintaining highway speeds. You don't seem convinced that nothing is wrong I gather? I can understand that too, if you are a driver like me, you are feeling something you never felt before. I have some stuff to post and will do so later. 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...
kens96 Posted January 30, 2009 Author Report Share Posted January 30, 2009 You can read my mind ! I've driven this car nearly 100,000 miles on the same road back and forth to work for 8+ years. I know how the car drives and handles on every inch of it. It might not be the transmission, but something is not right. Link to comment Share on other sites More sharing options...
kens96 Posted January 30, 2009 Author Report Share Posted January 30, 2009 Did a relearn and it didn't help. At least the problem is consistant. 20 minutes of driving-try to maintain above 70 mph and you can feel tha car jerk and watch the tach jump up and down between 3rd, 4th and OD trying to find something. Settle speed out at 60 mph and we are fine. Give it gas and it gets above 80 in 3rd solid but you can feel the engine or transmission kicking tach jumping slightly as trys to settle out. So I guess I'm looking for something that is speed related that feeds the computer information to adjust performance of the transmission and engine. Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 30, 2009 Report Share Posted January 30, 2009 Did a relearn and it didn't help. At least the problem is consistant. 20 minutes of driving-try to maintain above 70 mph and you can feel tha car jerk and watch the tach jump up and down between 3rd, 4th and OD trying to find something. Settle speed out at 60 mph and we are fine. Give it gas and it gets above 80 in 3rd solid but you can feel the engine or transmission kicking tach jumping slightly as trys to settle out. So I guess I'm looking for something that is speed related that feeds the computer information to adjust performance of the transmission and engine. I did some reading last night but did not find exactly what I needed. I did find a whole page on the 4th servo that I will scan and post. I have been trying to find what the PCM looks at to tell it that the engine is laboring or as the manual calls it engine load, when I find that and I think its the MAP, I will have a clearer picture. I still think that Kevin has it correct that you have a problem with the 4th servo 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...
kens96 Posted January 30, 2009 Author Report Share Posted January 30, 2009 Check this video link out This is what I'm getting Says the fix is the TPS Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 30, 2009 Report Share Posted January 30, 2009 Check this video link out This is what I'm getting Says the fix is the TPS Very interesting but I believe that a faulty intermittant TPS will set a code. Did his set a code? I think you are narrowing this down, HE was doing over 100. I do know that IF I lift my foot the slightest bit, I will come out of OD... Good work Ken, this is interesting stuff.. Ill be back later 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...
kens96 Posted January 30, 2009 Author Report Share Posted January 30, 2009 Doesn't say if he had a code. This is a Subaru and I believe the speedo is in kilometers. 108Km is about 69-70 MPH so the symptoms match. Dash looks very similar to the Caddy's ! Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 30, 2009 Report Share Posted January 30, 2009 Doesn't say if he had a code. This is a Subaru and I believe the speedo is in kilometers. 108Km is about 69-70 MPH so the symptoms match. Dash looks very similar to the Caddy's ! OH wow, I thought that was a cadillac dash! 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...
kens96 Posted January 31, 2009 Author Report Share Posted January 31, 2009 Went and got a TPS sensor at Advance Auto. Got home and started looking at this job. the TPS is sandwiched behind the top engine mount strut that has the small cooler hose going through it. What is the best approach. Remove the top strut mount, remove the TB, or remove nothing and hope I don't drop those little hex head screws. Has anybody done this? Link to comment Share on other sites More sharing options...
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