Skip the auto shop - Our mechanics make house calls

Q: Van shaking and misfiring.

asked by on

Van misfires and shakes a lot. The machine gives me a code P0300. I think it might be a combustion problem.

A: Hello, a P0300 is a general misfire code wi...

Hello, a P0300 is a general misfire code without pointing to any one cylinder. There should be more codes present indicating which cylinder(s) have a misfire condition. You are correct in stating that a misfire is a combustion concern. To have a misfire there has to be a lack of ignition or a lack of fuel. The basics need to be checked, fuel psi, fuel filter (should be replaced at max every 2 years), condition of the distributor cap and rotor, spark plug and wire condition. If all the basics are good, then it would be time to connect a scanner and see what is going on, and what the computer is seeing. You may need to enlist the aid of a mechanic to help narrow down the cause.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Occasional stalling and startup issues

Hello. This engine can stall for a number of reasons. If it happens only at idle, then it may have an intake manifold vacuum leak or a throttle body issue. If the throttle body is dirty, then this will occur....

Q: Engine steaming, smoking, and smelling.

The problem you describe is a blown leaking coolant hose or one of the cooling system components have started leaking. The strange smell may be the coolant burning off. This is a sweet smell. The cooling system has a leak...

Q: Something is draining my battery.

The radio should stay on if you turn off the car but it shouldn't stay on as you open the door. This is the normal way the radio should function. If the radio is staying on after you open the...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...