Got P300, P301 P303 codes

[JayG]

Was driving along, stopped at a traffic light and all of a sudden it started idling a little rough and the CEL started to flash and the computer said to drive slowly to service

Started to drive and after about 100 feet, the light went out and the engine was smooth again.

I was about 1 mile to my home, drove home and plugged in my durametric

There were 3 codes


This is the first time I have gotten ANY codes

I did a weekend at the track a week ago and all was good

I have 74k on the clock,. Plugs were changed at 60k Just did an oil change before i went to the track. All the oil changes (4)I have done since i bought the car in March 14 have been good

Any thoughts????

[tommy583]

I know it never rains in San Diego but maybe the coil packs are cracked and got wet? Just shooting in the dark here. I hope you get it sorted.

[JayG]

Its not wet here now nor did I drive over a puddle

[Original Bacon]

Originally Posted by JayG

Was driving along, stopped at a traffic light and all of a sudden it started idling a little rough and the CEL started to flash and the computer said to drive slowly to service

Started to drive and after about 100 feet, the light went out and the engine was smooth again.

I was about 1 mile to mi home, drove home and plugged in my durametric

There were 3 codes


This is the first time I have gotten ANY codes

I did a weekend at the track a week ago and all was good

I have 74k on the clock,. Plugs were changed at 60k Just did an oil change before i went to the track. All the oil changes (4)I have done since i bought the car in March 14 have been good

Any thoughts????

I know this might sound odd, but i've had a boxster for 2 years that has run like this everytime i start it up.
Code reader stated cylinder 3 misfire.
We took (1) coil from an old engine that came from another boxster in our garage, and popped in a new MAF that we had bought a while back. This thing runs like a top now. The MAF is pretty expensive so i wouldn't go for that first, but i did both at the same time so i can't say what caused it.

[tommy583]

Hmmm. Well I would start by checking the coil packs and wires. It could be as easy as loose connectors or old coil packs.

[pony13ca]

I got my MAF wet a little while ago, and threw the same codes, and idled really rough. Took it out, and gave it a good clean, and left it to dry over night. In the morning she was good as new.

[NewArt]

That bank is on the same side as the coolant overflow tube. I had this problem once with a cracked coil pack and a burp from the coolant tank. I changed the coil and displaced the tube a bit.

[JayG]

If the problem is cracked coils and them getting wet, I suppose I could spray some water up that side of the engine when it is running and see if it throws a code

Is that a good idea?

On another forum, someone suggested it might have been an injector as well