[jeffyjeff]

Hello everyone,

I'm having a problem with my Deville. Sometimes it runs great and then it will start to chunk on me. (Feels like some of the cylinders aren't fireing) Then it will run fine again. Doesn't matter how much gas is in the tank or the temperature outside. Sometimes it runs great when I first start it, and at other times it acts up right from the get go. It will also stall once in awhile, and when it does, the gas guage will read a few gallons less then just before it stalls, then the guage will gradually increase as I drive after restarting it. It always starts again after it stalls and seems to run better for awhile, then developes the same problem again. Any ideas people?

 

[basscatt]

Hello everyone,

I'm having a problem with my Deville. Sometimes it runs great and then it will start to chunk on me. (Feels like some of the cylinders aren't fireing) Then it will run fine again. Doesn't matter how much gas is in the tank or the temperature outside. Sometimes it runs great when I first start it, and at other times it acts up right from the get go. It will also stall once in awhile, and when it does, the gas guage will read a few gallons less then just before it stalls, then the guage will gradually increase as I drive after restarting it. It always starts again after it stalls and seems to run better for awhile, then developes the same problem again. Any ideas people?

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check for Diagnostic Trouble Codes -

if you don't know how - go here and read the ENTIRE post -

http://www.cadillacforums.com/forum...ncluding-1985/138257-how-pull-codes-dtcs.html

if you have any codes - post them here -
ALONG WITH THEIR DEFINITIONS -
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yours is the OBD - or OBD1 system -

 

[Ranger]

Clogged CAT or low fuel pressure (though neither would affect the fuel gauge)?

 

[jeffyjeff]

Hello viewers,

I am having my codes viewed on Wed. I will let you know. I'm looking at the fuel pressure angle.

 

[13ir14314]

Why have the codes read when you can do it yourself. Read the sticky at the top of the Deville forum telling you how to pull your own codes.

 

[basscatt]

Hello viewers,

I am having my codes viewed on Wed. I will let you know. I'm looking at the fuel pressure angle.

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pulling your own codes takes less than 2 minutes -
and you don't need anything but the car -

 

[jeffyjeff]

Ok. Thank you very much. I'll try pulling them myself. Do I just turn the ignition to on, or do I start the engine?

 

[Ranger]

Either way will work.

 

[jeffyjeff]

Man they go by fast. I got all kind of P codes. 13, 14, 16, 18, 20, 21, 22, 23, 24, 43, E30, E90, 111, 112, 507 and probably more. How scewed am I?

 

[Ranger]

Help us help you and always post the code definitions along with the codes. No one has them memorized.
http://myweb.accessus.net/~090/dtcobd1.html

 

[jeffyjeff]

Sorry about that. Will do.

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Ok, Here we go. Theses are all P (E) codes 13-right oxygen sensor not ready, 14-shorted coolant temp sensor, 16-voltage out of range (all SOL), 20-open fuel pump circuit, 21-shorted TPS signal, 22-open TPS signal, 23-electronic spark timing (EST) signal problem [EGR], 24-vehicle speed sensor signal to TCC, 30-ISC RPM out of range, 43-left oxygen sensor signal rich, 90-VCC/TCC brake switch/park/neutral switch input circuit problem, and 112-PCM PROM EPROM error. Don't know if all these need to be addressed, I justwant to get it running smooth again. Hope you can help me. I'm still taking it in on Wednesday to have some of the issues addressed. Thank you.

 

[Ranger]

I'd get that voltage issue straightened out first. Low voltage can cause false codes and wreak havoc with the electrical system.

 

[basscatt]

I agree with Ranger -
have the battery and alternator tested -

our cars do some mighty strange things if the battery and charging system aren't prefect -

clear the codes - and see what comes back -

 

[jeffyjeff]

I tested the output from the alternator when I replaced the battery last summer, and I was still having the same problem, but will check again and clear the codes.

 

[jeffyjeff]

To Ranger and Basscatt, I'm having a new ECM put in tomorrow, was causing low voltage to two of the injectors. Hope that is all it's going to need.

 

[Ranger]

Let us know how it turns out.

 

[jeffyjeff]

Just talked to the shop, new ECM did the trick. Thank you everyone for all the help.