Question about Cars & Trucks
Having a random misfire code from reader (P0300) I have already changed: spark plugs Spark plug wires camshaft position sensor in addition to all that tested coil pack, it passed. more info on the problem. I got a flashing Check engine light and a service tire monitor message. I have been deal with this problem for months, and have stumped 2 mechanic including the dealer (well more so ran out of money for them to dig more internally into the engine.
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Posted on Jan 02, 2017
What was the condition of the spark plug when replaced, was it indicating to a lean or a rich air fuel ratio. When is it misfiring?? during idle or while driving. The easy way to see if it's misfire during idle, disconnect the #2 wire from the plug and run the engine and see if there is any difference in the idle. If there is then the plug is firing and your getting the misfire during driving and that could be caused by a dirty fuel injector in cylinder #2 and may need it cleaned of replaced, but check the wire harness to the fuel injector it self be fore you go through all that. Good luck and keep me posted, be glad to help
Posted on Jun 15, 2009
SOURCE: Hesitation and stumbling.
Before you do that, check which thermostat it has in it, if it has one that is letting it get too warm or not completely up to temp when the computer think it should be, it would cause this. My 2000 crown vic did the same thing and thats what it was.
Posted on Jul 20, 2009
sound like bad ignition module.make sure where coil pack set in module contacts is clean and making good contact.also make sure plugs and wires is good.
Posted on Jan 09, 2010
A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.
Posted on Feb 25, 2010
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