#5.7 tbi bad spark plug symptoms code
When you have a code 300, the misfires are occurring in more than one cylinder, so another good suspect is low fuel pressure. In that case, you can switch two injectors, erase the fault code, then see if the code sets for the cylinder you moved the suspect injector to.
Most commonly the code will specify one or two cylinders that are having the misfires. The problem stems from different flow rates. (That's something professionals never waste their time on). They are not defective, so don't waste your time trying to test them. What's the true mileage? If it's over 100,000, a real common but elusive cause for multiple misfires on GM vehicles is the injectors. Also perform an exhaust back pressure test on that bank, a plugged cat converter can cause this also. Swap the Position 1 O2 sensors side to side to see if the misfires move to the other bank of the engine. If this condition is found, reposition and shield the harness to prevent a repeat concern and repair the connections.Ĭheck for excessive exhaust backpressure using the restricted exhaust diagnosis from SI. If water intrusion is found on the right bank, it may be due to the AC Evaporator Condensation dripping onto the O2 sensor harness. Inspect O2 sensor connections on the misfiring bank for corrosion or water intrusion. If a fuel injector concern exists, it is possible to misfuel an entire bank of the engine, causing multiple cylinders on the same bank to misfire even though the root cause is a single fuel injector. Perform a fuel injector balance test for all 8 cylinders. If the published misfire diagnostic does not isolate the cause, perform the following suggestions as necessary: DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank. I've had this problem before, try this info:Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine.
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