Question about 2001 Cadillac DeVille

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Engine runs rough at idle and seems to miss

I have change the injectors also the oxegen sensor plugs and plug wires .When I run the code it shows up several things .Is it yhe computer itself .It has 120,000 miles ..

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I don't think the computer, maybe the throttle position sensor, EGR valve, it could be a few different things but would put the computer at the end of the list. These will have to be checked for correct ohms and voltage to determine which isn't putting out the right ohms to work right.

Posted on May 07, 2010

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I have a 2002 mazda protege lx giving a P0300 code. scanner also says fuel system OL-fault, what do I need to look at?


Code 300 is for a random miss or loss of power which is tough to diagnose. Since you have replaced ignition parts, it could be an injector or fuel problem. Or a vac leak. Or a cam sensor, but usually a code would be set for the sensor too.

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My 2003 mustang has a misfire code P0302 and runs rough under load.


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- OBD-II Trouble Code P0300? http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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This will help.

Thanks.

Feb 13, 2012 | 2003 Ford Mustang

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Tuned up car changed 02 sensor full tank of fuel still running rough


Oxygen sensor only report the condition of the engine the rough running condition can range from a worn sparkplug wires to worn sparkplugs to valve problems to injector problems. with the cadillac deville a tune up should be the first attempt to smooth the rough idle with the inspection of the cap and rotor cap and rotor do have a tendancy to arc internally and create misfire so does sparkplug wire that can leak spark voltage to ground and create misfire. the spark plug wire especially if they are brittle and hard can create issues

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1 Answer

Running roug at low idle, smooths out at 2500 rpms


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91 LEGACY STARTED RUNNING ROUGH


The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

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1 Answer

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Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

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