Question about 2000 Pontiac Grand Am GT

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Diagnosed with random misfire

My car was diagosed with random misfire. So I installed spark plugs,boots.tps sensor and the cover for the spark plugs.But it still diagosed with same problem.

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You could have a bad coil or injector. I would lean towards the coils first. very common.good luck.

Posted on Jun 03, 2009

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Posted on Jan 02, 2017

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Cad low motor oil cause this misfire codes? po3oo


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

May 14, 2015 | 2005 Cadillac STS

1 Answer

What do I look for to correct a random misfire code on cylinder 1 and 4 on a 2006 Kia Soreneto 3.5 L? Have a;ready replaced the coil,plugs and wire?


first go over the plugs and wires again. Make sure plugs are gapped correctly, wire boots have good wire connection in the boot top, and the boot is seated correctly on the plug stem. ensure plug wires are soundly seated/connect at the other end. If you still get the misfire code -- get the engine diagnosed -- a sensor or a computer module may be faulty.

Mar 28, 2015 | 2006 Kia Sorento

2 Answers

98 Pontiac GRAND am


The plugs and crank sensor could have done it, but the TPS and idle air control would have nothing to do with a random miss.
A more likely cause is the ignition module or a fuel problem. You may have to wait until the problem is bad enough to kill the engine or you have more codes to check out.

May 20, 2013 | Cars & Trucks

1 Answer

1995 LS 400: RANDOM/CYLINDER MISFIRE, CRANKSHAFT POSITION SENSOR , ECM I have a 1995 LS 400 that is misfiring and check engine light on. Mechanic read code and found P0300 Random Misfire, P0305 Cylinder...


Up to this point in time, mechanic 1 has only done some maintenance work on the car. Things that would be done from time to time to maintain the car.
Since you have lost trust in this mechanic, I would go to a different place and have them diagnose the codes. If the second place gives you the same recommendation you can decide what to do.
You can tell the second place you are getting a second opinion, or not.

Feb 15, 2013 | 1995 Lexus LS 400

3 Answers

I am constantly getting the check engine light coming on. I get the following codes P0300, P0132 and P0152. Both o2 sensors have been replaced as well as spark plugs. Codes have been reset. Engine light...


No, it's not time to replace your PCM. It's time to properly diagnose and repair the problem. Most Oxygen sensor codes are not the fault of the oxygen sensor. codes P0132 and P0152 mean that both of your upstream O2 sensor circuits are shorted to voltage. It does not mean that the O2 sensors themselves are bad. The code P0300 is a random misfire code. This does not mean change the spark plugs. This means that several or all of the cylinders are misfiring. This could be due to spark plugs, but you will most likely get a single cylinder code (like P0301 or Po302 etc.) if the spark plugs are getting worn out. This random misfire code is most likely being caused by your shorted oxygen sensor circuits. If they are shoted to voltage they will cause your fuel to run extremely lean (vey little fuel) to the point that it is causing the cylinders to misfire. Code P0300 can have seveal different causes, including a fuel pump getting worn out, am manifold vacuum leak, an intemittent crank sensor signal, etc. When other codes are being set at the same time as a P0300, the other codes need to be diagnosed and repaired first.

Jan 11, 2011 | 2002 Chrysler 300M

2 Answers

OBD system diagnostic trouble codes? what do they mean? P0123 P0138 P0205 P0305 P0300


po123-tps curcuit high---po138-02 sensor high volts bank 1 sensor 2,--po205--injector curcuit open cylinder 5,---po305-- misfire cylinder 5,--po300 random/multible mis fire,

Jun 02, 2010 | 1998 Dodge Caravan

2 Answers

Random Cylinder Misfire


The cam sensor code is the part to concentrate on, also check the timing belt for excess play causing the camshaft to whip, this will cause a random miss.

Oct 30, 2008 | Saturn SL1 Cars & Trucks

2 Answers

Cylinder 3 misfire


Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.

Jun 10, 2008 | 1999 Pontiac Grand Am GT

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