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92 STS no start


uncletom

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I have a 92 STS with a 4.9. The car now has 250,000 on it and has always been dependable but it will now not start. I have replaced battery, cleaned in between the cables and all other ends. The codes in memory are E052, I052, I039. I tested the ohms through the key and also through the white wires wrapped in orange casing. I even tried putting a resistor underneath but to no avail. When it does start it runs fine as this problems started occuring at -4 degrees Cel. (this makes it difficult as here in Canada the winters are pretty cold) when the weather is warmer I never had a problem. Any help is appreciated. Thanks Tom

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Is is cranking?

Connect a fuel pressure gage to the schrader valve on the fuel rail and see what the pressure is when the key is turned on.

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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Is is cranking?

Connect a fuel pressure gage to the schrader valve on the fuel rail and see what the pressure is when the key is turned on.

It does not crank!

When the key is turned to start dash lights go out and nothing! When it does crank it starts instantly.

I thought at first it was the anti theft or key but it is inconsistent.

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Starter? Starter solenoid? Any clicks when you turn the key?

Adallak

No click, just a complete loss of power. At first I thought it was a bad battery, so I replaced it and the car started right up, two hours later nothing when trying to start. Battery voltage is good (new and has been tested on other vehicles) then I thought it was battery cables, taken them apart and cleaned in between. Still nothing when turn the key over, thought it was the key switch, measured and bypassed the vats still nothing. Temperature today was -1 car started right up, checked Alternator voltage with voltmeter it was good. Let the car reset computer through the run in procedure in manual everything good but temperature is supposed to drop again!!

Any help is greatly appreciated. I love this car and I would have been working on it earlier but some health issue forced me to let it sit for a while. Thanks Uncletom

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Seriously check your battery cables both ends. Check the relay center for IGN RELAYS or heavy 50 AMP fuses that have corrosion on them.

I had a 91 Seville, Ill look in the service manual later. Something is causing a complete loss of power... Check GROUNDS near your battery, see this ground schematic for the 92 Seville:

IPB Image

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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Ignition switch is another possibility . It is on the steering column (closer to the floor).

Good point Mike. A known bad grond is one on the engine block by the starter. It may look good, but replacing the stud (8x1.25mm) and a couple of star washers and cleaning the contacts never hurts.

The saddest thing in life is wasted talent

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Ignition switch is another possibility . It is on the steering column (closer to the floor).

Good point Mike. A known bad grond is one on the engine block by the starter. It may look good, but replacing the stud (8x1.25mm) and a couple of star washers and cleaning the contacts never hurts.

Thanks guys Adallak and bodybyfisher

I have a day coming up when I can get the car in the shop and I will go through all the grounds, great schematics/chart I will pull the starter and double check the power and the ground when I am at it. I will keep you posted.

P.S I also used to own a 56 Caddy 2 dr hardtop but sold it a few years back when I was off work for an injury. I know I know I still kick myself but life goes on. Uncletom

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We all regret our decisions, I have a bunch that I regret, like selling an 86 Corvette for $3500 in 1996 ....

Let us know how this turns out, ill check the manual, look at the underhood relay center closely. I think Adallak is talking about G104 ground...Check G100, G101 and G103 carefully...

We have seen a few 92's with ground issues, but you are getting a total black out... When it happens check if you have ANY power to anything at all.. If not, I would be looking at the main power feeds..

Also, be advised that a battery can have an internal short also and be intermittant

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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We all regret our decisions, I have a bunch that I regret, like selling an 86 Corvette for $3500 in 1996 ....

Let us know how this turns out, ill check the manual, look at the underhood relay center closely. I think Adallak is talking about G104 ground...Check G100, G101 and G103 carefully...

We have seen a few 92's with ground issues, but you are getting a total black out... When it happens check if you have ANY power to anything at all.. If not, I would be looking at the main power feeds..

Also, be advised that a battery can have an internal short also and be intermittant

BbF

With the battery that is why I decided to change it with a new one (yes, I have had new ones be bad but this one works in every thing else including my 46 Ford pickup streetrod) even the old one that I replaced will start everything. I might have to replace the heavy main cables + and - and continue the voltage readings. I am going to make up a heavy temporary ground also. I will keep you posted. Uncletom

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Maybe..

Check the starter enable relay. It is located under the drivers door trim panel...in car...not in door. It is taped into the wire harness in that area. See red X in picture. Has happened before on Canadian cars.....they get green..

post-2-1172730478.jpg

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It does not crank!

When the key is turned to start dash lights go out and nothing! When it does crank it starts instantly.

I thought at first it was the anti theft or key but it is inconsistent.

Okay, there are only two things that will cause you to lose power to all systems when you turn the key to START:

1] You are placing a direct short across the battery. Since you haven't mentioned a phone call to the local fire department, I'm gonna rule this one out.

2] You have a battery problem (apparently not likely), a battery cable problem (to be discussed), or a partially open hot wire or ground that affects the starter motor and/or peripheral systems. Losing all power to other systems indicates a large current draw is dropping the battery voltage somewhere in the chain due to a high resistance in that chain.

Assuming your grounds are good, this all points to the positive battery cable. I'd suggest you have a second look at it.

Of course, you could have an intermittently shorted starter motor, but I think the fire department would have alerted you to that. :P

Please let us know what you find. Our learning experience here only happens with that sort of valuable feedback.

Regards,

Warren

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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Maybe..

Check the starter enable relay. It is located under the drivers door trim panel...in car...not in door. It is taped into the wire harness in that area. See red X in picture. Has happened before on Canadian cars.....they get green..

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Maybe..

Check the starter enable relay. It is located under the drivers door trim panel...in car...not in door. It is taped into the wire harness in that area. See red X in picture. Has happened before on Canadian cars.....

Would a 'starter enable relay' failure account for the dash lights going out? I'm inclined to think not.

Regards,

Warren

Posted Image

There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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