Question about 2001 Oldsmobile Aurora

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I got a 2001 Oldsmobile aurora that the code reads PO301

I'm working on a 01 olds aurora with the 3.5 motor. I've changed spark plugs,O2 sensors and I still get the PO301 code. And ive also changed the coil packs. I'm really stuck I want to fix this car help me please thanks

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Well that code means ur have a missfire in cylinder one change the wires for the spark plugs that really the only thing i can think off beacuse you have already done the spark plugs and the oxygen sensors and the coil packs

Posted on Feb 26, 2013

  • Luke Massingale
    Luke Massingale Mar 16, 2015

    GM vehicles are known for the EGR Valve to go bad. I have numerous GMs and they all went out. Easy to change. I usually buy parts on eBay for $49. But I think they around $80 at aparts store.



3 Suggested Answers

Derek Colson

  • 87 Answers

SOURCE: 1999 oldsmobile aurora code p 300

could be an intake manifold gasket leaking, or improperly gaped spark plugs

Posted on Feb 26, 2011



  • 230 Answers

SOURCE: aurora 1997 i have changed the fuel pump,, fuel filter plugs,

Hi there
sounds like you done allot to this car. did you clean your gas tank? Reason i say this there are times you get bad gas that water with it. and it sounds like you got water in your tank. need to get it out. Try this get some rubbing alcohol and poor it in your tank. It won't hurt it. It will soak up the water that's in your tank. try this and let me know how it goes.
Thank you for writing to fix ya.
Best Regards Richard

Posted on Dec 29, 2009

Testimonial: "yeah, i did that this morning, the gas tank had a bunch of **** in it, changed fuel filter, tank needed cleaned same prob still thanks though"


Jeffrey Turcotte

  • 8984 Answers

SOURCE: 97 olds aurora code p0300. l have changed

Below are some tips for resolving a code 300. Have you taken the injectors out and watched them squirt? Unfortunately, I do not have a manual for your car.

Random misfire troubleshooting:
The engine computer sets these codes when the crankshaft position sensor indicates rpm hunting under constant external conditions. Therefore, it is very difficult to distinguish genuine misfiring cylinders from generalized rough running.

Random electrical misfire:
If the cause is electrical, it is in the ignition system that produces the signal to the coil(s). In older engines, this might be due to a failing ignition modulator or pickup coil in the distributor. In modern engines, it might be a loose, failing, or poorly connected crankshaft position sensor (or camshaft position sensor in those engines that use this sensor for spark timing). This condition may or may not set an OBD II trouble code. Because of the large variation in ignition systems, I recommend you get the wiring diagram for your ignition system to see what components may be the cause of an inconsistent ignition signal to the coil(s). In rare cases, the problem may be with the modern ignition control, engine control, or powertrain control module. The problem may also be with general deterioration of the ignition wires. This condition can be verified by running the engine in a dark environment and watching for sparks jumping off the coil or wires.

Air/Fuel causes of a random misfire:
For the issue to be identified as a misfire, the changes in conditions in the cylinders must be rapid rather than gradual (such as in the case of a hunting rpm). These kinds of changes may be caused by unsteady airflow in the intake or inconsistent injector operation. Always check for a clean throttle body and idle air passage as well as idle air control motor operation. Also check the EGR valve operation and flow path. There may be specific tests you can run on these valves for your car. Consult a manual if you want to check these out carefully. Most of these components can be cleaned with good old-fashioned carb cleaner. It's also a good idea to make sure your vacuum operated fuel pressure regulator (if you have one) isn't drawing fuel into the intake manifold through a torn diaphragm.
Random injector issues are rare but may be caused by dirty fuel or worn out injectors. Another possibility here is a camshaft position sensor malfunction, but this will usually set another trouble code. In rare cases, injector timing and pulse width irregularity can be caused by the computer itself.

Posted on Dec 05, 2010

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2 Answers

I have a 1996 crown vic i need to know these trouble codes po301 po304

PO300 Codes-- are cylinder misfires

PO301 thru PO308

Last # is the cylinder

Could be bad ignition coil for a cylinder
or a coil pack for that side,depending what
engine you have

#1 &#4 are at the front & back of the passenger
side of your motor or firewall side if transverse

You will need to provide details of who worked on it
& exactly what was done besides replace a coil based
on a code

Codes aren't very good with COP Ignition but a complete
coil pack on one side should take care of some issue

Vacuum Leaks & other items can cause misfires & the codes
don't tell you to replace ignition parts as you may have

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My 2001 oldsmobile aurora is misfiring and sputtering after i replaced the spark plugs?

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Bad miss at idle?

While stop engine idles like cylinder missing?

Engine Misfire codes for car?
Engine Misfire codes?

Misfire on cylinder 4?

Oil on spark plugs and car misfires?


This will help.


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I have a 2001 olds aurora 3.5v6 i took my car to

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01 olds aurora

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