Question about 2005 Cadillac STS

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My 2005 STS has given me a code that translates to multiple misfires. Any ideas?

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I changed my plugs and had to change my ignition coils right after like the day after but I got them online for cheap so it's running good now had misfire codes as well 92000 2006 STS

Posted on Apr 27, 2014

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MULTIPLE MISFIRE COULD BE FAULTY SPARK PLUGS OR CLEAN FUEL INJECTORS.POUR FUEL INJECTOR CLEANER IN FUEL TANK.CHANGE FUEL FILTER.

Posted on Mar 15, 2011

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A po300 means you have several cylinders misfireing ! Depending on mileage it could just need new plugs ! If you try new plugs only use delco plugs in that vehicle ; it will save you a lot of problems later down the road !

Posted on Mar 15, 2011

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P0300 Diagnostic Code - Random Misfire Technical Description Random/Multiple Cylinder Misfire Detected What does that mean? Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. Symptoms Symptoms may include: the engine may be harder to start the engine may stumble / stumble, and/or hesitate other symptoms may also be present Causes A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages Faulty camshaft position sensor Defective computer Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open. It is helpful to have access to a factory service manual and an advanced scan tool to properly diagnose a random misfire DTC. P0300 Diagnostics Video Here is a helpful video that may assist you in learning more, diagnosing, and repairing your P0300 DTC. This video is intended for auto repair professionals but could be helpful to DIYers. It shows use of an advanced OBD-II scan tool during diagnostic steps:

Read more at: http://www.obd-codes.com/p0300
Copyright © OBD-Codes.com Autolite Challenge Series P0300 Engine Misfire Diagnosis

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I've had similar issues. The fix I used was to take my vehicle to AAMCO and let them run a diagnostic check. Most often it will be at little or no cost and, if you don't want to mess with the fix anymore, they can fix it onsite.

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think it needs a new computer or maybe resetting at the dealers ,bit above me and beyond ,not ask me about a nice set of stromberg carbs ?

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1 Answer

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Clear the code with OBD2 code scanner. If it comes back on, you
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Here you go - this'll help you translate your engine codes. Looks like your getting a "Multiple Cylinder Misfire With Fuel Cut-off" and "Misfire Cylinder 5 With Fuel Cut-off". Hopefully you just need a good tune up, but this should point you in the right direction. Good Luck.

http://www.obd-codes.com/trouble_codes/bmw/

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I have an 2005 ford f250 with the 5.4L. and its showing codes po174, po300, po305, po307 and i alreadt put a new maf in. what should it look at next?


Did you resolve the other codes? p0300 random multiple misfire, p0305 misfire cyl #5, p0307 misfire cyl #7? You could have bad ignition coils or a vacuum leak. Check your coils and check for vacuum leaks at the intake manifold check vacuum hoses. Hope this helps!

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Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
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if that is the problem it sounds like it may be time for a tune-up, plugs n wires. hope this helps you

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What is rundam misfire


Hi,

To my knowledge, random misfire could be described as failure of any of the sparkplugs to fire in an unpredictable manner. A misfire is any of the plugs not firing but in a given time period, predictable. Random misfire on the otherhand comes and goes, sometimes it misfires, sometimes not. This is often an indicator of a loose electrical problem which is intermittent in nature.

The error code P0300 pertains to the above described random misfire or in some instances multiple misfire. The last digit (except when zero) wold points to which cylinder is not firing.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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