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1999 STS stopped while driving


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Hi,

I have a 1999 STS that while I was driving the car shut off without any warning. I tried the start it back up but it just turns over without attempting to start. When I go through the information center there are a number of items that are not showing. The trans info (Park and Drive) is not showing and when I turn the key on the gauges are not moving at all. Checked all fuses.

Please help... :wipetears

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  • 3 weeks later...

Not without testing it first.

Hi,

Sorry it took so long to get back. Here is what has been going on, I took the car to the dealer and they explained that there were two splice packs that were bad so they replaced them. The battery was also bad but they fixed the car with the bad battery in it. After picking the car up I bought a new battery. After a couple of days the car needed a jump to start. Then I notice that while monitoring the battery level on the information center, the level was fluctuating between 14 and 12 rapidly. After a while it stopped. I also noticed it before the car stopped running the first time with the bad battery in it. Couple of days after that incident the car shut off while driving again, when I attempted to start the car it just turn over continuously with no sign of fire. I’m back in at point A. The battery seems to be fine, I put it on the battery charger and the level was fine. The car still continues to turn over just not starting. Oh and I also switched the coil packs and ignition module. I will be taking it back to the dealer so they can resolve the issue that I took in for in the first place. Any input would be greatly appreciated.

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  • 1 month later...

Hi,

All my problems seem to come from a bad fuel pump with the exception of running rough at idle. Not sure if it was the power source that was draining the battery but I don’t have any more problems. I didn’t take it back to the dealer, after a while I began to think that the reason the car wouldn’t start could be due to the fuel pump. I stopped to get a can of quick start, after using it the car started right up but of course shut off after a short while. I bought a pump and replaced the old one, everything has been fine since.

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Hi,

All my problems seem to come from a bad fuel pump with the exception of running rough at idle. Not sure if it was the power source that was draining the battery but I don’t have any more problems. I didn’t take it back to the dealer, after a while I began to think that the reason the car wouldn’t start could be due to the fuel pump. I stopped to get a can of quick start, after using it the car started right up but of course shut off after a short while. I bought a pump and replaced the old one, everything has been fine since.

This is too simplistic to say in hindsight, but I'll say it anyway for the possible benefit of future readers.

Nowhere in this thread did I see any mention of Diagnostic Touble Codes (DTC).

Cars assembled on or after 1/1/1996 include an exhaustive set of onboard diagnostic protocols, commonly referred to as OBDII, that are designed, and mandated by federal EPA standards, to avoid/prevent using a shotgun approach to engine related problems.

The OBDII DTC can be displayed on some models of cars with this method:

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

And yes, some versions of Cadillacs assembled prior to 1/1/1996 (under OBDI rules) were capable of much more than a "read only" function.

Someone please move this thread to the appropriate year/model location.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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Hi,

All my problems seem to come from a bad fuel pump with the exception of running rough at idle. Not sure if it was the power source that was draining the battery but I don't have any more problems. I didn't take it back to the dealer, after a while I began to think that the reason the car wouldn't start could be due to the fuel pump. I stopped to get a can of quick start, after using it the car started right up but of course shut off after a short while. I bought a pump and replaced the old one, everything has been fine since.

This is too simplistic to say in hindsight, but I'll say it anyway for the possible benefit of future readers.

Nowhere in this thread did I see any mention of Diagnostic Touble Codes (DTC).

Cars assembled on or after 1/1/1996 include an exhaustive set of onboard diagnostic protocols, commonly referred to as OBDII, that are designed, and mandated by federal EPA standards, to avoid/prevent using a shotgun approach to engine related problems.

The OBDII DTC can be displayed on some models of cars with this method:

http://www.caddyinfo...adingcodes.html

And yes, some versions of Cadillacs assembled prior to 1/1/1996 (under OBDI rules) were capable of much more than a "read only" function.

Someone please move this thread to the appropriate year/model location.

Good point Jim. The only mention at all was "Oh, and when I connected the scan tool to the car it read error check the connection and try again."

A scan tool is certainly not needed to pull codes on a Cadillac. I agree the codes should be checked with the on board system, and perhaps should have been to start with, but that's hindsight for you. There could be other gremlins hiding out in your car that you are unaware of, and it never hurts to double check. I pull my codes once a week or so, just to be sure there's nothing new going on.

big4870885.jpg

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I read this thread for the first time today. When I first read the issue, I immediately thought of the fuel pump, but the issue with the Park/Neutral, and the "error message" changed my mind at first & I thought all electrical.

Unfortunately, when a fuel pump fails, there is no exact error code telling us so. It reports codes like MAP error/MAF error/Stall detected etc. Unfortunately there is no code for "low fuel pressure" or low current to pump - boy I wish there was.

I would say there could have been 2 failures (pump & under hood electrical), or just the electrical failure, and it wasn't caught till the fuel pump was replaced.

If anything I just want to say that if a car is driving, and it just dies, listen for the fuel pump to run when you turn the key. I also read that if the car dies, and can't be restarted, that giving the plastic fuel tank a few good punches from underneath, many times get's the pump going again so you are not stranded. I'm hoping someone can verify this for us (although I am not wishing that anyone's fuel pump fails).

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  • 3 weeks later...

Hi,

I really apologize for sounding stupid :huh: . I realize that I didn’t mention that when I did an onboard diagnostics but being that there seemed to be an electrical problem, there were not any codes. It was as if the battery was disconnected when the issue first happened. This is why I used a scan tool in the first place. I did start a thread asking help for a rough idle problem (http://caddyinfo.ipbhost.com/index.php?showtopic=32370&st=0&p=173884&fromsearch=1entry173884 ) before I posted this one and the other thread listed the codes prior to this issue. After changing out the fuel pump, the only codes I had after that were:

DTC P0171 Fuel Trim System Lean Bank 1 - Current

DTC P0174 Fuel Trim System Lean Bank 2 - Current

DTC P0300 Engine Misfire Detected - History (intermittent)

Now I believe that the fuel pump was going out prior to the motor change because the car shut off but I was able to start it back up every time. I wouldn’t accelerate, when you try to the power would drop but wouldn’t shut off unless you hold the pedal down. At this point I did receive the MAF code. I went and bought one, replaced it and the problem still occurred. This is when I decided to replace the motor. I was having an overheating issue with it anyway.

Hopefully this will clear up any confusion. I would gladly answer any additional questions if needed.

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A bad fuel pump or clogged filter could cause a LEAN code on both banks, I suppose

Check to see if your 99 has a rubber 'plenum' between the back of the throttle body and intake manifold, we have seen those LEAN codes when that plenum develops a split or hole, check the bottom of the plenum carefully if you have one. The hole allows unmetered air into the intake causing those LEAN codes. The hole almost always appears on the bottom from EGR gases that settle at the bottom (inside) and the goo slowly destroys the rubber

You can spray carb cleaner around it and see if the idle changes also

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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Thanks Ranger

Those two LEAN codes mean the unmetered air is getting into the intake,

Check the seal behind the throttle body, check all vacuum hoses, check the brake booster hose, check the EGR heater pipe. Check the intake for cracks

Does anyone know if the BACKFIRE blowout port was used in the 99?, can it leak?

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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They all have an over pressurization relief valve Mike. I think the '99 is still behind the P/S pump. I believe in 2000 they where moved to the TB end of the manifold. They can leak, but it not common and when it does it usually creates a telltale whistle.

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They all have an over pressurization relief valve Mike. I think the '99 is still behind the P/S pump. I believe in 2000 they where moved to the TB end of the manifold. They can leak, but it not common and when it does it usually creates a telltale whistle.

Thanks Ranger, I never ran across it before,

These two lean codes must be caused by something that is affecting both banks

If this car is not sucking unmetered air, maybe the fuel pump pressure is down, I would also check the fuel pressure

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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Ok,

I checked around the throttle body and found that one of the screws were lose, tighten it up and running at idle got better but not sure if P171 and P174 would come back. I took the car for a ride, cleared the codes (While driving) and after about a quater mile the check engine light poped on as I was stopping at a light. I received coeds as follows

P753 - 1 - 2 Shift Solenoid Circuit Electrical

P758 - 2 - 3 Shift Solenoid Circuit Electrical

P1645 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit

P1860 - TCC PWM Solenoid Circuit Electrical

What is going on? The tranny was slipping or anything to make me think the trans would be a problem. Can anyone help?

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Look for a common ground or feed in the manual....

Sounds common to me to occur so abruptly

How is your battery, have you had it load tested lately, and check the connections at the battery, look of the condition of grounds

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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I had the battery replaced about 2 months ago. I did disconnect the battery then reconnect it and the check engine light was on as soon as I started the car. Checked the codes and the same ones appeared. Code P102 was added to the rest. I will check the manual tomorrow. Also, the last time i had the car at the dealer which was about 2 months ago they replaced the motor ground cable and 2 splice packs.

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hi,

i found what the problem was, it was the ignition 1 fuse blown in the fuse compartment under the hood while i was looking for the problem. the motor ran great in idle. the motor wasn't running lean and had normal exhaust. before the fuse blew i could smell that it was running lean in the exhaust. after replacing the fuse the car started up and immediately shut off; i had to press the gas to keep it running. now it runs rough in idle again. if i take the fuse out the car runs fine but if i put the fuse back in it runs rough. without the fuse all codes reappear (t0102, p0753, p0758, 1645 & 1860), trans is stuck in 2nd, wont shift and smooth idle. with fuse the codes are gone and trans shift fine but has rough idle.

i did do some more research and found a form that had the exact same issue (all same code, etc), heres the link: http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/102992-wiring-scheme-98-deville.html. This is exactly what helped me. The ESC fuse will set the P0753, P0758, P1860, P0102, P1645

Even corrosion or High resistance on the fuse will set the DTC's

Reply With Quote .

--------------------------------------------------------------------------------

02-08-08 11:37 AM #10 scl98sts

Cadillac Owners Member

Cadillac(s) I Drive: Cadillac

Join Date:Jan 2008

Location:ORL. FLORIDA

Posts:20Re: Wiring Scheme for 98 Deville

ok i will check . i havent touched anything i dont want to mess it up and i refuse to take it to the dealer or mechanic shop. everybody wants to tear it apart or replace the most expensive parts thanks

BUT MY MOTOR DOESN'T RUN GOOD AT IDLE

ANY FEEDBACK?

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Put the fuse back in, then disconnect the battery, reconnect then start it

Maybe, its got to do with the fuel trim needing to be reset

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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