Why do i get a p0300 random minn code?

SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

SOURCE: 91 S10 2.5L TBI- no fuel spray, did I test this correctly?

put a full bottle of stp injector cleaner in half a tank of fuel and run it . use techron chevron fuel cleaner,
Vitally

The GQ

• 32 Answers
• Posted on Sep 20, 2009

SOURCE: My 2000 Chevrolet S10 ZR2,

I have done a full engine replacement on these, a zr2 to be exact. I have found that a p0300 (multiple misfire) usually points the the Piece of **** injection spider, then I had a p0301 as well after replacing that with the multiport unit upgrade and found that the spark plug electrode folded over shorting to the center conductor.

Marc Reaves

SOURCE: 2000 CHevy Silverado misfire code

try also the knock sensor..computer cant adjust timing

SOURCE: hello there, i have a

the error code Stands for: random/multiple cylinder misfire detected. sounds like you just forgot to reset the error code once you repaired the issue.... hmmm,

A P0300 OBD 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 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 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.
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