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I really hope someone out there can help me here I have a 1993 deville and I have taken it in for a complete tune up and had it lubed and all but it still tends to cut out first thing in the morning when I rach a certain speed and my service engine soon light keeps coming on I am at a loss as to what else I can service on it I am new here to the USA, from australia and well we dont have cadillacs over there so I am not familiar with the maintence on mine can someone give me any suggestions as to what couild be causing this problem
 

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2003 Cadillac DeVille
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Frank said:
I really hope someone out there can help me here I have a 1993 deville and I have taken it in for a complete tune up and had it lubed and all but it still tends to cut out first thing in the morning when I rach a certain speed and my service engine soon light keeps coming on I am at a loss as to what else I can service on it I am new here to the USA, from australia and well we dont have cadillacs over there so I am not familiar with the maintence on mine can someone give me any suggestions as to what couild be causing this problem
The first thing you may want to try is pull 'Diagnostic Codes' from the computer memory. When your service engine soon light comes on that means it has detected an engine problem and stored a code in the computers memory.

To access these codes, turn the key to 'Run' but do not turn it over. Then on the climate control hold OFF and WARMER buttons simultaniously. After about 3 seconds or so, the dash panel will flash the approaite codes to you. It will display the codes. usually beginning with 'E' then a 2 digit number. (ie. E42). it will usually be followed by either a C or an H denoting wheather the trouble code is Current or History.

Do this procedure, write down all the codes, then report back!
 

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2dfx said:
The first thing you may want to try is pull 'Diagnostic Codes' from the computer memory. When your service engine soon light comes on that means it has detected an engine problem and stored a code in the computers memory.

To access these codes, turn the key to 'Run' but do not turn it over. Then on the climate control hold OFF and WARMER buttons simultaniously. After about 3 seconds or so, the dash panel will flash the approaite codes to you. It will display the codes. usually beginning with 'E' then a 2 digit number. (ie. E42). it will usually be followed by either a C or an H denoting wheather the trouble code is Current or History.

Do this procedure, write down all the codes, then report back!
Thank you for getting back with me, I did as you said and what it said on the display is E39 and after that it read .7.0 can you tell me what that means there was no C or H follwed by the E39
 

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Frank said:
Thank you for getting back with me, I did as you said and what it said on the display is E39 and after that it read .7.0 can you tell me what that means there was no C or H follwed by the E39
Sorry I forgot that this system didn't record history of codes.

E39 = TCC Engagement Problem

This means that for some reason, your torque converter clutch is having problems. Thats probably why your engine keeps cutting out it because it can't back the engine off the transmission when you are driving. Unfortunately, it is mounted inside the transmission and requires it to be taken apart in order to service. Take it to a mechanic and see what he'll charge to check out the TCC.
 

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2003 STS w/BoseNav, 1993 Deville, 1985 Deville
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Here's the skinny on the E39 problem:

http://caddymb.netgetgoing.com/messageDetail.asp?MessageId=23715

However, the E39 code doesn't explain why the engine keeps cutting out. I think you might have another problem.

I'm having the same E39 problem, too, but I've been having it for over a year and it's nothing that I'm really worried about.

As for the cutting out, is it kind of like it's running out of gas? If so, might want to replace the fuel filter for starters.
 

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Frank said:
I really hope someone out there can help me here I have a 1993 deville and I have taken it in for a complete tune up and had it lubed and all but it still tends to cut out first thing in the morning when I rach a certain speed and my service engine soon light keeps coming on I am at a loss as to what else I can service on it I am new here to the USA, from australia and well we dont have cadillacs over there so I am not familiar with the maintence on mine can someone give me any suggestions as to what couild be causing this problem
When the service engine light comes on,it is the oxygen sensor that needs replaced,,, Stop useing premium gas. It burns too hot and burns up the sensor. Use unleaded regular. Might make your car ping, but won't have to put up with the light coming on.
I have a 93 deville and have the same problem. Also 2 codes about the transmission comes up when running dianostics on it,but haven't checked into them futher!
One bad sensor will show others bad ,replace the bad one,the oxygen sensor and then clear the computer,,run codes on it again!
 

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93 devillelemon said:
When the service engine light comes on,it is the oxygen sensor that needs replaced,,, Stop useing premium gas. It burns too hot and burns up the sensor. Use unleaded regular. Might make your car ping, but won't have to put up with the light coming on.
I have a 93 deville and have the same problem. Also 2 codes about the transmission comes up when running dianostics on it,but haven't checked into them futher!
One bad sensor will show others bad ,replace the bad one,the oxygen sensor and then clear the computer,,run codes on it again!
Oh yeah that makes a lot of sense

"Stop using the right gas and shoot up your engine!"

With the diagnostic systems on these cars, it would set an oxygen sensor code if it were bad. The SES light comes on to warn you of a emissions-related code being set in the memory.

EDIT -

Besides, if the O2 sensor was gone, it would have set either E13, E44 or E45 which are Oxygen Sensor not ready, O2 Sensor Lean and Rich, respectively.
 

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01 frontier , 89 Shelby CSX vnt
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well alot of us get the tcc code and most of us still run OK , but your right , a o2 sensor would show up in a code dump but i cant see anything that would cause it to die in the mornings , i just wonder if its EGR , either the valve is bad , clogged egr ports,or a bad vacc line after the solenoid , the ecu has no idea whats going on with the EGR system outside the solenoid , and this could be what causeing him greif , not to mention outside a replcement of the egr valve (69.95 @napa) it could be fixed cheap in the driveway

hell to clean out the tubes all he needs is a wire coathangar and someone to hold the throttle @ W.O.T so he can get to the 2 tubes under the throttle plates , id do that first check the lines second , then go to the caddy message board ont he process on checking out the EGR valve as it wont open by applying vaccum to the nipple from a hand vaccum pump , it needs exaust backpressure to work or be checked
 

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Stoneage_Caddy said:
well alot of us get the tcc code and most of us still run OK , but your right , a o2 sensor would show up in a code dump but i cant see anything that would cause it to die in the mornings , i just wonder if its EGR , either the valve is bad , clogged egr ports,or a bad vacc line after the solenoid , the ecu has no idea whats going on with the EGR system outside the solenoid , and this could be what causeing him greif , not to mention outside a replcement of the egr valve (69.95 @napa) it could be fixed cheap in the driveway

hell to clean out the tubes all he needs is a wire coathangar and someone to hold the throttle @ W.O.T so he can get to the 2 tubes under the throttle plates , id do that first check the lines second , then go to the caddy message board ont he process on checking out the EGR valve as it wont open by applying vaccum to the nipple from a hand vaccum pump , it needs exaust backpressure to work or be checked
My 91 Deville has always set a code 39 (I bought it used). I told the transmission man about this when I had it rebuilt. He replaces the convertor and all valves as part of the service, and assured me that problem would be cured. I still get a code 39 as before. My mileage is good, so I assume my locking torque converter is working okay.
I feel better now that I see others living with it as well.

Keith
 
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