Question about 2002 Cadillac Deville

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My 2002 cadillac deville is reading po300 (random misfire) what should i do?

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Posted on Jan 02, 2017

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SOURCE: 2002 Cadillac Coolant sensor

The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment

Posted on Oct 08, 2008

  • 135 Answers

SOURCE: How do I turn off the Traction control system on my 2002 Cadillac

press the traction control switch.

Posted on May 19, 2009

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SOURCE: 2003 cadillac deville want start

check battery voltage, if battery voltage is ok, you may need to check fuses under hood on passengers side, if start fuse is ok, you may need to have your starter replaced

Posted on May 28, 2009

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SOURCE: hey i have a few problems with the cadillac deville 03

change the air fow senser.

Posted on Jul 06, 2009

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SOURCE: cylinder 6 misfire for 2000 cadillac deville 4.6 liter engine

check out this tool. Brand new on the market and it quickly can diagnose a misfire from the plug or the coil pack. Here's their website

Posted on Sep 03, 2009

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How to check coil packs and spark plugs wire with a multimeter. ..having random/ multiple misfire P0300...need to know their spec? 97 Cadillac Deville, 4.6 engine/Northstar

I don't think you really understand what this fault code means, it means that likely all the engine cylinders are misfiring at random no set pattern, not any particular cylinder. I would start with checking for engine vacuum leaks like the intake manifold gasket. that is all I can say since you provided no make, model or year and engine type and size information.

Sep 21, 2016 | 1997 Cadillac DeVille

3 Answers

Gm code po300

This is a misfire code. Start with the basics, fuel filter, spark plugs, vacuum leaks, wires etc. If after checking/changing necessary parts, if problem persists you will need to go deeper as in coils and computer controlled parts such as map sensor, maf sensor

Sep 10, 2014 | 2002 Chevrolet Blazer

1 Answer

1999.cadillac code po300

The link below will take you to a page that will describe all the possibilities for your code. Unfortunately, P0300 is a generic code indicating a misfire but without a cylinder number (typical codes would be P0302 with 2 indicating the cylinder number causing the fault) you can't rule out any of the cylinders or causes so diagnosing the problem is basically trial and error.
OBDII Code P0300

Oct 27, 2011 | 1999 Cadillac DeVille

1 Answer

2002 cadillac deville. We have replaced: Radiator, water pump, thermostat, cooling fan, coolling relay and still it overheats. I'm getting a cyclinder misfire on the code readout and no clue where to...

The cyl misfire is a clue. most likely you have head gasket leakage. Have a auto shop do a BLOCK-TEST it will test the cooling system for combustion gases.

Aug 02, 2011 | 2002 Cadillac Deville

1 Answer

Pcm po300 97 cad deville what does this code mean?

random misfire does the engine have lack of power or a miss... sounds like maybe bad coil pack......wire.....or plug do good tune up see what happens let me know if more help needed

Sep 01, 2009 | 1997 Cadillac DeVille

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