Question about 1999 Chevrolet K1500

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The computer say's theres ramdom misfiring/or misfiringin some cylinders

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Best way to check for misfiring is to do a cylinder leakage and injector balance test.
To do leakage test go to Autozone and purchase an adapter for your spark plug threads so you can install this adapter and fill the cylinder w compressed air to conduct your test. Remove plugs and disable fuel pump and set each cylinder your about to test at TDC, then fill cylinder w air and listen for air leaks .
If air escapes threw intake manifod intake valve(s) are leaking . If air escapes threw exhaust exhaust , exhaust valves are leaking. If air is heard in crank or PCV valve then pistons are leaking.
Do an injector balance test . this one I recommend you have a technician do . Its a little dangerous.
Lastly spark tests. Although not completely conclusive ( in other words this test will tell you if you have spark or not it will not tell you how much spark) you can use a spark tester and test each cylinder for spark. A scopemeter will give you the amount of spark,. As you can see the best thing to do and its worth the money is to bring it to a repair shop. I'm hoping that its not engine mechanical that are giving you the grief (thats big money) hopefully you luck out and its plus and wires. I'll even take an injector. Good luck

Posted on May 04, 2010

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What could be the problem if its putting out a p0300 code ramdom miss fire its on a 2.2


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 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.


Hope this helps; keep us updated.

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P0300 is a ramdom emgine missfire, have the dealer check the intake manifold for vacuum leaks and run a power balance test on the engine, the check gauges light comes on because the truck is stalling with the key on, this is normal

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