The coads po303 p0306 help

Do tune up,coils module,wires,plugs and see what happened..

Swap spark plug with cylinder 4. Swap COP (coil over plug) with cylinder 2.
If problem moves to cyl 4, bad spark plug.
If problem moves to cyl 2, bad COP.
If problem remains in cyl 6, suspect valve or piston problem.
Start with compression check

check spark plug of the cyl. switch plug with another cyl, run engine until warm to see if misfire still comes on. if it stays on the same cyl. fault could be high tension wire or coil or worse leaky valve or rings. if misfire switched to the other cyl just change plug or better replace all plugs

The old give me money for nothing statement from a mechanic instead of knowing how to fix it.
code p0300 refers to random/ multiple cylinder/s misfire detected===causes--spark plug/s---HT lead/s---injector/s---ignition coil/s--low compression--wiring
code po303 refers to cylinder 3 misfire detected--- engine mechanical fault---wiring---ignition/ fuel system---injector --ECT/MAF sensor --- ECM
code p0306 refers to cylinder 6 misfire detected===causes --engine mechanical fault---wiring---ignition / fuel system---injector ---ECT/MAF sensor---ECM
code po316 refers to misfire detected during start up--first 1000 revs==causes--engine mechanical fault---wiring---ignition /fuel system---injector
code po2195 refers to heated oxygen sensor (HO2S) 1 bank 1 signal stuck lean===cayses ---HO2S---fuel pressure---injectors---intake leak
it also refers to O2S sensor 1 bank 1 same causes and also refers to HO2S 1 bank 1 implausible signal===causes --- short to positive---short to ground---Ho2S ---ECM
code po2196 refers to the same items as 2195 . some causes are also air intake restricted
Have a compression test done some where else and it will indicate the condition of the motor. The rest is sensors and wiring problems.

Coil plugs swapped.

i still have same code po303 i have change spark plugs and coil i add a ground wire i can resat end drive for 20+ milages no check enigine light
turn off start up runs for minute or so then coms back on check enigine light same po303 enigine runs very smoth no vibration what so ever I AM LOST

Please go to this page for engine misfire causes.

Okay, you were getting code P0306, and a P0316. You have replaced plugs and swapped coils around are you still getting the code P0306? or is it a different code for a different cylinder now? Replacing your crankshaft position sensor in this case will merely waste your money. Its doing its job, the P0316 is telling you you had a misfire in the first 1000 revolutions of your engine at startup, the P0306 is telling you its probably cylinder #6 that had the problem. there is no code there indicating your CKP is bad.

Now if you swapped your coils and the misfire is still on cylinder 6, its either injector problem, or base engine. If the misfire has moved to another cylinder, replace that COP.

Hope helps.

Causes for a cylinder misfire include. Bad spark plug, bad spark plug wire, bad coil ( or coil pack) if no wires, Bad fuel injector..I would start in the order I listed.

my money would be on the coil cover, especially if it had been a long time since the last tune up. it is certainly worth trying, as this is part of a routine tune up anyways. good luck!