Set timing mode problem!!!!! Please help!

[nlong1024]

I just bought a 91 Cadillac Seville with 68,000 miles on it. Per the previous owner the car had been sitting for several years. I am having a couple of problems with it and am wanting some advice or direction on what I should do to fix it. Here's the deal....

There are some issues with it staying running once you start it up... It turns over will idle high (1500-2500 RPM's) and some times sputter and then turns off. Other times it will start, idle high, if you pump the break a few times the idle goes down to about 650-750... and then it will drive fine. While driving and watching the center screen I notice the RPM Will drop down to 0 while driving and then I get the message, "Set Timing Mode".... Sometimes I get the message before the RPM's drop, sometimes I don't and then the car will die out completly. Usually when going to restart the car it will idle hard, and high, and I've noticed the accelerator pedal kind of bounces a little bit. It seems like it's trying to keep it from dying on it's own, but the RPM will read 2000 one minute then 0 the next yet the car will still be running. ANY IDEA WHAT THIS COULD BE OR WHERE I SHOULD START?????

[nlong1024]

I just bought a 91 Cadillac Seville with 68,000 miles on it. Per the previous owner the car had been sitting for several years. I am having a couple of problems with it and am wanting some advice or direction on what I should do to fix it. Here's the deal....

There are some issues with it staying running once you start it up... It turns over will idle high (1500-2500 RPM's) and some times sputter and then turns off. Other times it will start, idle high, if you pump the break a few times the idle goes down to about 650-750... and then it will drive fine. While driving and watching the center screen I notice the RPM Will drop down to 0 while driving and then I get the message, "Set Timing Mode".... Sometimes I get the message before the RPM's drop, sometimes I don't and then the car will die out completly. Usually when going to restart the car it will idle hard, and high, and I've noticed the accelerator pedal
kind of bounces a little bit. It seems like it's trying to keep it from dying on it's own, but the RPM will read 2000 one minute then 0 the next yet the car will still be running. ANY IDEA WHAT THIS COULD BE OR WHERE I SHOULD START?????


I also just went and pulled the codes now, and I'm getting the following...

E014~Shorted Coolant Temp Sensor
E015~Open Coolant Temp Sensor Signal
E016~Voltage out of range
E022~Open TPS Signal
E023~Electronic Spark Timing (EST) Signal Problem (EGR)

Can anyone give me some advice on what to do and where to start?

[Dave S Texas]

Replace the coolant temp sensor. That should take care of 14/15. 16 is a generator voltage problem. 22 is, most probably, a wire-connection problem. Check for the plug being connected properly to the TPS. 23 may be similar...faulty connection to the Distributor. Do you know how to access the Parameters in the computer diagnostics?

[nlong1024]

Thank you I'm going to try out your first suggestion as soon as I jump off of here...

I do not know how to check the parameters... Do you have that info?

[Dave S Texas]

I do not know how to check the parameters... Do you have that info?
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This is something you should have knowledge of. This part of the computer is very helpful in assessing the performance of the various sensors. I strongly suggest you purchase a Cadillac Factory Service manual for your vehicle. There are many used '91 Seville manuals for sale on ebay. The FSM is an essential tool for anyone who works on their own car. The small price is paid-back with the first problem you fix using the information your Cadillac FSM gives you.

[nlong1024]

Will do, much appreciated! Thank you!