Gas cap, check engine and PO300

TOMATON22

MEMBER
2007 DODGE CALIBER
2.0L
4 CYL
FWD
AUTOMATIC
153,000 MILES

I just got this car and have this issues, first it has a check engine light on and when pushing gas pedal it can only go to 4000 rpms and the check engine flashes continuosly until I let go the gas pedal, chaged spark plugs and checked injectors but problem persist, checked the codes and is showing po300, im cluless on what to do, also cleaned intake and changed air filter, buyed a gas cap at autozone but problem is the same, hope you can lead me to what to do next, thanks in advance.

1 Reply

CARADIODOC

MECHANIC
33,754 POSTS

P0300 - Random/Multiple Cylinder Misfire Detected

The flashing Check Engine light indicates the most serious of conditions. Too much raw unburned fuel is going into the exhaust system where it will overheat and damage the catalytic converter. If that occurs constantly, you're supposed to stop the engine right away before that damage occurs.

The spark plugs are a good suspect, but you also have to consider compression, mismatched injector flow rates, (more of a problem on GM cars), fuel quality, and ignition timing. There isn't much you can do without a scanner to look at live data and fuel trim numbers.