Question about 1999 Mitsubishi Galant

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Error code P0300

I keep getting error code P0300 after conducting tune-up and rotor and cap replacement

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Code po300 refers to random/multiple cylinder/s--misfire/s detected.===causes-- spark plug/s--HT leads /s--injector /s--ignition coil/s--low compression ---wiring
Check that the HT leads are not touching each other causing spark cross over . Ensure that the coil wires are properly connected . From what you have done, I would revisit everything ( all connections ) to ensure that everything is in order including firing order of the leads

Posted on Apr 21, 2014

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My 1999 lexus es300 is still reading the codes P0300, P0302,P0303 after giving it a tune up.


Your codes indicate misfires. What was done in the "tune up"? Misfires can be caused by any of several different causes including (but not limited to):
spark plugs
spark plug wires
coil packs
injectors
injector wires

The term "tune up" used to mean, "replace points, condenser, distributor cap and rotor, and plugs". Since most cars no longer have points, condenser, distributor cap and rotor, we need to ask what was done...

Jun 16, 2015 | 1999 Lexus ES 300

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Has p0300 code misfire cyl 2 and 3


If it was just cylinder 2 or 3, the code would be 0302 or 0303. Instead, you have random misfires (probably) such that you should be checking things that affect the whole engine. Vacuum leaks, bad plug wires, bad coil(s) or ignition module are most likely, but even clogged exhaust, O2 sensors and bad battery can cause these problems. Yes, a battery can be good enough to start your car but still be bad enough to affect performance. If I had to guess, I would start by testing the ignition module. Most parts stores can test this if you remove it and carry it to them.

May 04, 2015 | 1998 Chevrolet Blazer

1 Answer

Ps300 code


I think that you have a typo and believe that you meant p0300.
If so p0300 means multiple cylinder misfire.

A tune up will usually fix this problem.
spark plugs
wires
ignition rotor ( if it has one )
distributor cap ( if it has one )
Ignition coil
pcv valve.

Check your tune up.

Mar 30, 2013 | 2001 Mitsubishi Galant

1 Answer

P300 p304 1997 dodge caravan.


P0300, Multiple Cylinder Mis-fire
P0304 #4 cylinder misfire
do the compresion test on all cilinders. check wiring on injectors....
Marko

Feb 05, 2012 | 1997 Dodge Caravan

2 Answers

We put a tester on my 1999 blazer and it came up 1 code P0300???? gettin a seconed opion


p0300 is a random misfire, which usually indicates almost anything-generally a good tune up will fix it, like new wires, plugs, clean the throttle body, dist cap/rotor, check charging system, check fuel pressure, replace fuel filter...it is random (usually fuel) but a good going-over by a decent and honest mechanic will fix it.

Apr 21, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

I have a 1998 dodge caravan. it keeps giving me a P0300 and P0305 code. I replaced the cap,rotor, plugs and wires in june 2010. Once again I just replaced the cap and silicone sprayed it. however it's...


Good Evening, I am sure you know the 0300 is a random cylinder misfire and the 0305 is a cylinder 5 misfire. One would not think that you should have to do another tuneup since you did one in june. I would say the parts are under warranty and if you feel that is what is wrong you should be able to replace them. However you could have a vacuum leak, or injector going bad. First I would pull that plug and check compression on that cylinder to start with. Also check out the plug while it is out. And go from there. Cheapest route is of course the re-tune which warrantied parts cost nothing but time. Let me know how it goes.

Nov 02, 2010 | 1998 Dodge Caravan

1 Answer

What is the meaning of 98 Honda Civic error codes P0300 P0303 P0304? Engine will not start, does not seem to fire.


P0300 indicates that there is multiple miss fire in the ignition system. P0303 and p0304 indicates the miss fire is in cylinder #3 and #4. Replace the spark plug, and wire set, and rotor and cap if there is one. Can not remember if there are coil packs on the civic, the age thing. change the fuel filter and clean out the fuel injectors with fuel injector cleaner for the next 3 full ups. When the spark plugs are removed, inspect them for condition, if there clean or dirty with carbon build up. which would indicate how the engine is running. Keep me posted and drive safe.

Jun 04, 2009 | 1999 Honda Civic

3 Answers

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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