Question about 1992 Cadillac DeVille
Posted by Anonymous on
If the EGR is stuck open mechanically or from carbon the idle can go high . A bad IAC or incorrect signal from the computer module can cause high idle . Vacuum leaks from intake gaskets and PCV valves .
Posted on Jan 04, 2018
Not without testing ? Your best bet , take it to a qualified repair shop.
Posted on Jan 04, 2018
I'd start by tracing the fuel supply and return lines from the gas tank to the engine compartment. Make sure that they are free of kinks or other damage.
Next, check the fuse box and make sure there is power to the fuel pump. Trace the electrical connections leaving the fuel tank and make sure they weren't torn or otherwise damaged by the tire tread.
Hope this helps and good luck!
Posted on Jan 13, 2009
your water pump may need to be changed. have a trusted mechanic check it. the water pump is connected to the drivebelt of your 4.9 l engine, and if thats where the sound is coming from you can be pretty certain
Posted on Aug 10, 2009
Remove your entire coil pack and ICM, disassemble it, and clean every contact and connector
Something's fishy with the ICM trigger signals, and you may just luck out with a good electrical cleanup.
or maybe even replace it
Posted on Apr 30, 2010
SOURCE: I have a 1995 Cadillac
I have a similar issue with a 94 DeVille. Runs for a while then shuts down. Fuel pressure is good (I drove around with a pressure gauge attached and it still shut down with no drop in pressure). I've replaced the idle control and ignition module - no improvements.
I too have code P012 showing which to (potentially) the crank position sensor - which I can't seem to locate.
Any luck on your issue?
Posted on Oct 06, 2010
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.
fuel press reg:
Posted on Oct 24, 2010
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