Remove all the spark plugs and run a compression test on every cylinder. A misfire can be caused by a burnt valve, cracked head, or blown head gasket. A compression test will eliminate any of these possibilities. If you find a cylinder with low compression, then it may be time to open it up and find out what is going on. If you have a sweet smell at the exhaust, air bubbles coming from the radiator, loss of coolant with no apparent leak, or coolant in the oil, these are all symptoms of a blown head gasket or cracked head.
fuel injecters bad
Misfire on more than one cylinder. Start by replacing your plugs and plug wires. If that does not solve the problem, run a compression test to determine if you have a burnt valve.
A cylinder misfire can be cause by a bad spark plug or a bad fuel injector. Replace the spark plug to see if the problem is corrected.
Stop by http://www.coloradofans.com there are different people that have had that problem. you can probably message them personally and see how they got to that problem. P0300= Random/ multiple cylinder misfire detected P0301= Misfire detected- cylinder #1 P0302= Misfire detected- cylinder #2 P0303= Misfire detected- cylinder #3 P0304= Misfire detected- cylinder #4 p0305= Misfire detected- cylinder #5 P.S. These are Diagnostic trouble codes, not vechicle id numbers.
a po300 code is a random misfire code witch means it is not just missing on just one cly. witch kind of eliminates a ignition problem unless you have multiple ignition parts going bad more likely a fuel problem or vacuum leak
Replace all the spark plugs and plug wires. If that does not solve the problem look at the coils.
Make sure you check the EGR valve, mine went bad and it gave me a multiple cylinder misfire code... It means it is misfiring on more than one cylinder. A new set of plugs and or plug wires may fix the problem. But it can also be many other things. Vacuum leak, fuel injector problem, etc ALSO coil packs can give you a code for multiple random misfires
injector problem
It's telling you that you have a problem. Get a code scanner and find out what the problem is. that's a misfire .i had tht problem and i changed the spk plug cable
It depends on what you mean. If you mean an actual misfire, that is caused when the primer does not ignite. That is normally caused by a firing pin problem, or by a bad primer.
The most common reason for a misfire is the ignition coil that is connected to the sparkplug on top of the problem cylinder.
If your 1997 GMC 5.7L Vortec has a misfire at an idle but not while under throttle, the problem is likely the timing. This can be adjusted.