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1996 Deville stalling/jerking on highway


randy_1986

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Hello. First off let me say that i just bought this car for $400 from a pawn shop here in town. Body is in awsome shape and only needed a battery, so i snatched it up. Took it in for an oil change and had the fuel filter replaced. Fluids were all checked and ok..and was told that the rear main seal is leaking (Common on these motors i hear). 185000 miles and i no nothing about the history on this car.

My problem right now is i get really bad stalling/jerking while accelerating. I can tell its missing a little at take off..(changing plugs and wires this weekend) But when i get up past 45 on the highway...and am giving it a little bit of gas, It starts to jerk really bad, but as soon as i give her some more gas..it comes out of it. It feels like the tranny is slipping to be honest, But i dont know jack **** about cars so...

I guess im just looking for a little advice on what to check first. I was told by one person that he had a cracked tranny filter that caused it too lose pressure and jerk like this, was told by another that its probably the fuel pump running on its last leg. Was also told a tune up just might take care of it, which i will see this weekend if thats the case. Anyone out there have/had this problem? Any info would be great. Thanks

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The first thing to do is to see if your on board diagnostic system set any trouble codes, go here follow the directions for your year and post any DTC codes here

http://www.caddyinfo.com/readingcodes.html

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

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The bucking that is occuring at approximately 45 MPH sounds like a lockup problem with the torque converted clutch (TCC) in the transmission. This should have caused your service engine soon (SES) light on the instrument console to set. Does this happens every time you acceleralte to 45 MPH or only the first time after the engine is restarted? You will know more after you post back with your codes as requested by BBF.

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Pull the plugs and inspect them - you might find that some have lost the platinum pad on the ground electrode. That would create a much larger plug gap and would cause a misfire which you would notice as jerking/bucking. I almost describe it as the engine acts like there is water in the fuel.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Pull the plugs and inspect them - you might find that some have lost the platinum pad on the ground electrode. That would create a much larger plug gap and would cause a misfire which you would notice as jerking/bucking. I almost describe it as the engine acts like there is water in the fuel.

Could also be a bad MAP sensor. If it is, it should give out a MAP sensor code.

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The first thing to do is to see if your on board diagnostic system set any trouble codes, go here follow the directions for your year and post any DTC codes here

http://www.caddyinfo.com/readingcodes.html

Thanks for the quick responses. Heres everything it told me.

PC1611 History

PC0300 History

PC1599 History

PC1602 History

PC1603 History

PC1381 History

PZ1558 History

PC1599 History

AC1340 History

PC1571 Current

PZ2042 Current

PZ2088 Current

PZ2056 Current

No IPC Data

No SDM Data

No TCS Data

No RSS Data

No RFA Data

No RFN Data

No IRC Data

Edited by randy_1986
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Hmm you have a full house, try having your battery load tested and check the battery connections, a weak battery can throw all sorts of codes you should eliminate that first.

P1571 - Traction Control Torque Request Circuit

P1611 - Loss of CVRTD Serial Data

P1599 - Engine Stall or Near Stall Detected

P1602 - Knock Sensor (KS) Module Performance

P1603 - Loss of SDM Serial Data

P1558 - Cruise Control Servo Indicates Low (not 100% sure about this one)

P1381 - Misfire Detected - No Communication with Brake Control Module

P0300 - Engine Misfire Detected

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

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The battery is brand new. Voltage was reading over 14v the other day.

When i asked about the car, and why it was so cheap i didnt get much info.

All i got out of them was that they tried to jump start it and some wires started smoking so they didnt want to mess with it :blink:

Minus the missing, its one hell of a $400 car :yupi3ti:

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The battery is brand new. Voltage was reading over 14v the other day.

When i asked about the car, and why it was so cheap i didnt get much info.

All i got out of them was that they tried to jump start it and some wires started smoking so they didnt want to mess with it blink.gif

Minus the missing, its one hell of a $400 car yupi3ti.gif

OK, that is a good hint, take a look at your positive battery cable and see if you see any lumpiness or burns, if the key is held to start too long, the battery cables can melt and oxidize, causing hard starting and lower voltage, check them. The smoking was probably the positive battery cable heating up

In addition check your positive battery cable, it is two cables with a lead lug (Pb) between them, it corrodes in there take off the red insulator clean it and make sure its tight.

As others noted check the ignition wires for burning, age, loose connections at either end, burned connectors, check the plugs

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

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The battery cables (at least the positive one) probably should be replaced. A burnt cable will short to the body parts and drain your battery. Besides, a smoked cable will likely have a higher resistance. Hopefully no damage has been made to the PCM.

The saddest thing in life is wasted talent

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