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1999 toyota corola code po300 and missfire under lode at 2000 rpm

Missfire under the lode

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P0300 Random misfire is generally caused by bad or cotaminated fuel or vacuum leaks.

Posted on Apr 27, 2010

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Innova 3030 shows a code PO300


PO300 is a random misfire code. Generally, a coil needs to be replaced. The DIM in your car should specify which one. (My 2000 S80 did). Easy to change.

Mar 17, 2015 | 2000 Volvo S80

1 Answer

My 99ram2500 bucks an missfires but if i remove cap from vacumm system it runs better


No-- it does not run better

Your letting in unmetered air & the oxygen
sensor sees that & the computer adds fuel
& your rpm goes up for awhile

Are the spark plugs over 3 years old?
Is the fuel pressure at motor correct
Does the misfire set a PO300 code
Does the check light stay lite or blink
Is the egr system working as it should
Any vacuum leaks,exhaust,evap system,
intake.
O2 Sensors over 100,000 miles,front ones
PCV vacuum leaks

See if you can get a road test with a professional
scan tool along & look at cylinder misfire counts &
fuel trim

Nov 30, 2012 | 1999 Dodge Ram

1 Answer

I have a few error codes for my 2004 dodge ram hemi 1500 4x4. they are po172, po300, and po304.


The p0172 is due to an O2 sensor in the exhaust seeing too much oxygen, the po300 is a missfire present and p0304 is cylinder #4 missfire, check plug and wire to #4 and repair, this should also take care of the p0172, if a cylinder is missing it is just pump air into the exhaust thus causing the code p0172.

Jan 13, 2012 | Cars & Trucks

1 Answer

Toyota corola 2000 codigo p0440 /p0441 /p0446


for these code you can try:

Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.

Inspect the EVAP system for cuts/holes in tubes/hoses.

Inspect for damaged or disconnected hoses around the Evap purge solenoid.

Check and/or replace the sensor.

Check and/or replace the purge valve.

Have a professional use a smoke machine to detect leaks.

Aug 25, 2011 | 1999 Toyota Corolla

1 Answer

I have a 1999 Chevy Blazer 4.3 . It is running bad . I used an OBD II scanner and it pulled up a PO300 code which suggests a Laundry list of things that could be wrong . ...


p0300 should be multiple missfire. check for compression these engines tend to bend valves very easily if ran on old gas or a batch of bad gas. causing it to missfire in more than one cylinder. they also crack heads between valves if overheated.

Mar 16, 2011 | 1999 Chevrolet Blazer

1 Answer

My 04 dodge drango will not stay runnig iit started to run rough then started dieing after falling under 2000.rpm like going around a coner i went home to pull the cods and it eas po300 & po304 i...


Just cleaning a sensor will not help it, the first thing is to check for a bad injector, swap injectors with another cylinder and see if the misfire move, but first make sure the fuel preasure is good,

Oct 04, 2010 | 2004 Dodge Durango

2 Answers

I have 1999 318 4x4 dakota with fault coads


These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.

Feb 25, 2010 | 1999 Dodge Dakota

1 Answer

99 4runner misfire


make cranshaft gear has not spun under timing cover ive seen it happen before

Dec 27, 2008 | 1999 Toyota 4Runner

1 Answer

Po302 code,po301,po300


usually a p0300 is a random missfire code due to a fuel problem probaly bad gas , use some in tank fuel treatment such as techron or lucas injector cleaner, after adding fuel disconnect negative terminal to batt, to clear codes and see what happens

Dec 27, 2008 | 1999 Toyota 4Runner

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