996 Carrera 4S 03

[domingo]

I have a C4S 03, and have taken it to the dealer several times for the last 2 years for service because the check engine light turns on and the car docent fail at all.

They have changed, all the oxygen sensors, all the spark plugs, all the ignition coils, the ignition wires set. And still the light turns on.

The codes it's giving are this PO300 Porsche Fault code 507 misfire detection and PO306 Porsche fault code 509 misfire cylinder 6, this last code changes from cylinder 6 to 5 sometimes.

What can I do? The dealer docent have a clue of what to do next, I have told the to call Germany for assistance but I get no answer. :lightbulb:

[mikehenry]

I have a 996 4s and had somewhat the same problem. Fially when they were replacing the lifters, they took the engine apart and the camsaft came out in 2 pieces. There was no friction between the 2 halfs, so it would run for awhile with out trouble , but then the engine light would come on .. Has run perfectly since. mike

[Loren]

I have a C4S 03, and have taken it to the dealer several times for the last 2 years for service because the check engine light turns on and the car docent fail at all.

They have changed, all the oxygen sensors, all the spark plugs, all the ignition coils, the ignition wires set. And still the light turns on.

The codes it's giving are this PO300 Porsche Fault code 507 misfire detection and PO306 Porsche fault code 509 misfire cylinder 6, this last code changes from cylinder 6 to 5 sometimes.

What can I do? The dealer docent have a clue of what to do next, I have told the to call Germany for assistance but I get no answer. :lightbulb:

Check the coil packs and spark plugs on cylinders 5 and 6. Double check the electrical connectors too.

[Dharn55]

Are you saying that the camshaft ws broken in half, and part of it was not spinning and the engine still ran OK except of the error codes?

[domingo]

I have a C4S 03, and have taken it to the dealer several times for the last 2 years for service because the check engine light turns on and the car docent fail at all.

They have changed, all the oxygen sensors, all the spark plugs, all the ignition coils, the ignition wires set. And still the light turns on.

The codes it's giving are this PO300 Porsche Fault code 507 misfire detection and PO306 Porsche fault code 509 misfire cylinder 6, this last code changes from cylinder 6 to 5 sometimes.

What can I do? The dealer docent have a clue of what to do next, I have told the to call Germany for assistance but I get no answer. :lightbulb:

Check the coil packs and spark plugs on cylinders 5 and 6. Double check the electrical connectors too.

Yes I have already checked the coil packs & spark plugs on cylinders 5 & 6 and they seem to be OK.

[number9ine]

I have a 996 4s and had somewhat the same problem. Fially when they were replacing the lifters, they took the engine apart and the camsaft came out in 2 pieces. There was no friction between the 2 halfs, so it would run for awhile with out trouble , but then the engine light would come on .. Has run perfectly since. mike

Dude. I wanna see pics of this...

[PutPut6]

Swap the coils from cylinders 1 and 2 to 5 and 6. If the misfires stay at cylinder 5 and 6, you most likely need to start looking inside the engine mechanically. If it's coils, the misfire will move to cylinders 1 and 2. But if all the coils have already been replaced and you're still getting the misfire faults, I'm suprised the dealer didn't recommend checking engine internals.