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Random engine misfiring- fault code P0300- 1999 cutlass

I have a 1999 custlass that is experiencing random misfiring and displaying code P0300. It started it all at once. I have changed all plugs and plug wires. It seemed to have no effect. Before that it had a faulty O2 sensor but it has been replaced. What should I check next?

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  • Anonymous Mar 19, 2014

    ithas arandom mis fire what would cause it

  • Anonymous Mar 22, 2014

    misfiring random

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Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300

Posted on Dec 15, 2008

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Scan the computer for trouble codes, unless that is where you got the random misfire code. It may point out the problem. Misfires are usually fuel/air, spark (ignition), or cylinder compression related. The pcm senses a loss of power through the crank sensor, noting the crankshaft doesn't turn as fast as it should. If it cannot isolate it to a particular cylinder, it will set the random misfire code.
Would be good to know what fuel pressure is as a start. Note that cold start problems may be fuel related, as the engine requires more fuel on a cold running engine. If the coolant temperature sensor is out of whack, the computer may not realize it is a cold engine. Just a possibility.

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hi my is jose, a few months ago i had a toyota with the po300 random misfire. The problem was the spark plugs, thats is easy way to eliminated the codes. try this steps first.

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2007 Volvo XC90 fault codes-ECM P030000, P030100, P030300, P0304000, what do they mean?


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1 Answer

95 cutlass supreme's random misfire has mechanic stumped.


SOUNDS LIKE IT COULD BE A BAD CONNECTION AT THE BATTERY. IF THE TERMINALS ARE LOOSE OR CORRODED THEY CAN DISPLAY SOME OF THESE SYMPTOMS. IF THEY ARE TIGHT AND CORROSION FREE, THEN HAVE THE BATTERY CHECKED FOR VOLTAGE AND COLD CRANK AMPERAGE AT YOUR LOCAL AUTO PARTS STORE. MOST AUTO PARTS PLACES CHECK THIS FOR FREE. BUT DON'T RULE OUT A BAD BATTERY CABLE. THANKS FOR USING FIX-YA. PLEASE KEEP ME POSTED. GOOD LUCK

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1997 Oldsmobile Cutlass P0405 EGR Error Code


P0300 Diagnostic Code - Random Misfire
Technical description:--
Random/Multiple Cylinder Misfire Detected:---
Exactly what does this code means:--
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:--
the engine may be harder to start.the engine may stumble / stumble, and/or hesitate.
other symptoms may also be present…There may be rough idle, sputters and stalls and jerks.
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 EGR valve / passages, Faulty camshaft position sensor, Defective computer.
Possible solutions for this error problem:--
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 vehicle, 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 un-metered air getting past the airflow sensor, or an EGR valve that is stuck open.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Dec 29, 2008 | 1997 Oldsmobile Cutlass Supreme

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