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95 Eldo - Can a T073 Code cause misfiring?


eldoetc95

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Hi everyone,

I need some help. I have a 1995 Eldorado ETC with 174,000. A few days back, car was running fine. On my way home from work, I was stopped at a traffic light, I took off from the light and even thou the car accelerated, something happened, instantly there was a very noticable 'stumbling' and it was down on power. I have been having an intermittant P056 (Input sped sensor problem) AND a T073 (PCM - EBTCM/EBCM Pulse Width Modulation Signal Fault). Before my engine problem arose, the P056 code had stopped appearing for a few weeks. But now, the T073 code is on constantly. When I start the car and the DIC goes thru its monitering system check, it doesn't tell me all systems are ok, it immediatly goes to code T073. This situation started and coincides with the current condition of the car running rough. I changed all 8 spark plugs yesterday, and it had absolutly no effect at all, still idling rough and running rich. The idle rpms will actually pulse as the car sits there in park. The pulsations are about 1 to 2 minutes apart. The stumbling can be felt thru acceleration also, even at speed, even thou much less than at idle. Last summer, I cleaned the throttle body, put in a new Idle speed selenoid and changed the EGR valve. I guess, my first question is, can the code T073 cause my engine to run this way? Is it possible I have a bad PCM? Would bad wires or coils cause this code T073 to appear? Is there any way to check for bad coils? I need to get this sorted out or the car has to go :( . I love this car, its Black on Black, I put 2005 polished aluminum 7 spoke STS wheels on it with BF Goodrich KDA's (a bit wider than stock). Car looks great (I blacked out the body side chrome also, but the paint is chipping, needs to be redone). But if I can't work this out, it needs a new home. Oh, the fuel rail recall has NOT been done to it as of yet. Again, if anyone can confirm for me if code T073 can cause engine running problems and what possibly my next step could be, I would greatly appreciatte it.

Thanks

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T073 is related to the Traction Control System (TCS), I would say NO it could not cause your roughness. No other codes? A serious misfire would set a code...

Since you changed the plugs, I would check each wire with an ohm meter and I would spritz them at night in pitch dark to see if you get any arching and spritz the coil pack.

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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BodybyFisher, I have no other codes..at all. Which has my head spinning here. I will do the arcing check tonight, but some how the way my luck has been lately, odds are against me that I will see anything. Thanks for the quick reply. Hope I can fix her.

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I might have mis-spoken before, I am not sure if the 95 OBD1 systems will set a mis-fire code...like the OBD2 systems...

You will find the problem if you are methodical about your process. Something happened quickly in your case, consider that you broke a vacuum hose or plastic adaptor someplace... I would look your engine over really carefully for cracks in vacuum lines, tanks, and fittings

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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