Question about 1992 Cadillac DeVille

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Idle on my 1992 cadillac deville is very low

My 1992 cadillac deville was running rough, and the diagnostice code indicated that the EGR valve needed replacement. I replaced the EGR valve, and now the idle is very low and dies out which was not happening before this. The code now indicates that the ISC motor is bad. Is there a way to adjust the idle without replacing the ISC valve?


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No take that ****** out and give it a bath in carb cleaner 20 mins coat with wd 40 reinstall if its better by a new one any way only a temporary fix dont////dont turn any screws

Posted on Jan 28, 2010

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Please help: 1992 Cadillac Deville: idles slightly rough, gas mileage has decreased. The check engine light goes on and off every once and a while. I got codes E13 and F48. Any advice is greatly...


E13: right bank O2 sensor, no data
F48: low refrigerant level in A/C system

Neither of these is likely to cause rough idle, but I would change the sensor.
If that cure it, great.

If not, make sure the vacuum hose on the fuel pressure regulator (at end of fuel rail) is tight at both ends and not cracked or leaking. Then pull the vacuum hose off the regulator and see if there is any fuel in the vacuum hose. If yes, replace regulator.
I also recommend cleaning up the intake side of engine with carb cleaner or equivalent: throttle body, Mass airflow sensor, EGR system, and PCV valve. Make sure EGR valve is operating.

If you have questions, please let me know.

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fuel press reg:

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Oct 24, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

Engine runs rough especially on idle


I had same problem, and found the problem again in egr, replaced it under warranty and bingo.

Jul 26, 2010 | 1991 Cadillac DeVille

2 Answers

Car stalls out when it gets hot


THE ENGINE COULD BE GETTING TOO HOT DUE TO STOP UP RADIATOR CORES OR ENGINE BLOCK STOPPED UP WITH RUST RESTRICTING COOLANT FLOW.THERMOSTAT NOT OPENING FULLY AND CHECK FOR LOW COOLANT.

Jun 12, 2010 | 1992 Cadillac DeVille

1 Answer

1990 cadillac deville 4.5l runs rough and missfires. Checked fuel pressure and for vac. leaks, both ok. have replaced plugs, wires, cap, rotor, performed injection service. no results. Hooked to scope and...


Had a computer on my 1990 Cadillac Deville bad, after changing plugs, wires, cap, fuel injectors, egr valve, etc.

The computer was not firing an injector and i had a miss and rough running mostly at 35 mph on the roads. It bucked like a bull.in a rodeo.

Aug 02, 2009 | 1990 Cadillac Deville

3 Answers

My 91 cadillac runs rough just on idle


If by rough you mean it sputters like it's idling too slow, it's most likely the TPS (throttle positioning switch) which controls both the cold and warm idle.
Could also be a MAP sensor. Run the diagnostics test on the car and retrieve the error codes to point you in the right direction. Go to the link below for information on retrieving the self diagnostics on your Caddy. Best of luck.
Greg
http://www.troublecodes.net/cadillac/cadbrom.shtml

Jun 28, 2009 | 1992 Cadillac DeVille

1 Answer

Po302 code


cylinder 2 misfire po302

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INCREASED ENGINE RPM'S ON MY 99 CADILLAC DEVILLE


throttle position sensor. or idle control sensor

Feb 12, 2009 | 1997 Cadillac DeVille

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