P0300 Code

[riley6]

Thought I'd start a new topic. My 996TT showed a P0300 code - 304,305, 306 at AutoZone today. BUT it runs fine, maybe alittle turbo spool up lag at slow speed (2nd gear) but this may be the car's nature (just bought it). Any ideas?

[Loren]

P0300 Misfire Detection (Sum Total)

P0304 Misfiring, Cylinder 4

P0305 Misfiring, Cylinder 5

P0306 Misfiring, Cylinder 6

Did you get a CEL?

If not these corrected themselves.

If you did get a CEL then the most obvious causes are spark plug coils or spark plugs.

Since it is only on one side it could be the camshaft control for that bank.

[riley6]

P0300 Misfire Detection (Sum Total)

P0304 Misfiring, Cylinder 4

P0305 Misfiring, Cylinder 5

P0306 Misfiring, Cylinder 6

Did you get a CEL?

If not these corrected themselves.

If you did get a CEL then the most obvious causes are spark plug coils or spark plugs.

Since it is only on one side it could be the camshaft control for that bank.

Yes I got the CEL. It temporarily cleared this morning but returned, although the driving characteristics didn't change. Camshaft control? I don't like the sound of that :o

If you didn't see my first post, I just bought this car from an out of state dealer, so he owes me to get the light cleared. But I don't want to go back if I don't have to, maybe I can have it done locally. Do you think cleaning the MAF or adding some Techron fuel cleaner could solve it?

[Loren]

Since you just bought the car I would recommend that you take it to a good Porsche shop or dealer that has a PST2 or PIWIS tester and have them go through the car.

It is odd to have misfire on all 3 cylinders of one bank.

I would ask for a recent service history too - always a chance that a spark plug replacement went wrong.

[wross996TT]

Do you think cleaning the MAF or adding some Techron fuel cleaner could solve it?

No this will not likely clear the fault...take Loren's advice.

[riley6]

Thanks guys; I will do that.

So I shouldn't even bother using the goods I bought from AutoZone (Techron and MAF cleaner)?

[wross996TT]

Thanks guys; I will do that.

So I shouldn't even bother using the goods I bought from AutoZone (Techron and MAF cleaner)?

IMO, fix the faults first...then OK to use those products.

[riley6]

Do you think I'll be ok driving the car 2 hours with the light on (still running without problem)? The dealer wants me to bring it back to him and if I take it local he is not willing to pay the consumer labor rate, as he can fix it in-house (so he says).

[wross996TT]

You should be OK, just take it easy. Or you could request a flatbed from the dealer and see if they are willing to pay for that or pay for local P-car service (this is what I would do).

[riley6]

I'm taking it to a local reputable shop tomorrow to get a complete diagnosis, then I will go from there depending on what the problem is.

[riley6]

The baby is ok :D , she just needed new sparkplugs. Looks like there weren't changed at 30K miles.

[riley6]

Is there any operation that correlates to 3000 rpm? I spoke to soon the light back on :angry: , but it seemed to come on/blink at a sustained 3K rpm.

[wross996TT]

blinking cel is NOT good...you should not drive it....did they inspect the coil packs when they changed the plugs?

[riley6]

blinking cel is NOT good...you should not drive it....did they inspect the coil packs when they changed the plugs?

I'm not sure if they did, but taking it back in the morning! They are supposed to be a reputable porsche mechanic in this area.

So do you split time between here and 6speed?

[riley6]

blinking cel is NOT good...you should not drive it....did they inspect the coil packs when they changed the plugs?

Could it possibly be something serious? :( It runs hard and smooth; maybe bucks/sensitive throttle alittle in 2nd gear at low rpm.

[Chuck Jones]

WROSS is like the CIA....he's everywhere....here, Pelican, SixSpeed, RennTech, Rennlist, 911Turbo....virtually everywhere.

Edited September 8, 2008 by Chuck Jones

[riley6]

WROSS is like the CIA....he's everywhere....here, Pelican, SixSpeed, RennTech, Rennlist, 911Turbo....virtually everywhere.

LOL...I need to join some of these other boards too.

[wross996TT]

..he's everywhere....here, Pelican, SixSpeed, RennTech, Rennlist, 911Turbo....virtually everywhere.

Actually I have set my browser to bring up certain sites...and contrary to popular belief, I just focus mostly on 996 and especially 996TT. I learn a lot from everyone and when I can I help out. BTW, what is Pelican? Also on flat-6, rennteam and turboflatsix.

[riley6]

..he's everywhere....here, Pelican, SixSpeed, RennTech, Rennlist, 911Turbo....virtually everywhere.

Actually I have set my browser to bring up certain sites...and contrary to popular belief, I just focus mostly on 996 and especially 996TT. I learn a lot from everyone and when I can I help out. BTW, what is Pelican? Also on flat-6, rennteam and turboflatsix.

Back to the topic Wross :P The car is in the shop but the tool is reading no code, so they ordered a Porsche reader. The car drives fine according to me and them, despite the CEL blinking for 5-10 seconds and stopping, while driving. Any clue what code would not be read by a generic reader?

[wross996TT]

I'm confused....a reputable shop as you call it and they don't have a Porsche scan tool. There is no substitute. Until we get the actual codes we would just be guessing.

[riley6]

I'm confused....a reputable shop as you call it and they don't have a Porsche scan tool. There is no substitute. Until we get the actual codes we would just be guessing.

Yes they are well known in Delaware and race too. But I think they deal with mostly older Porsches which is maybe why they didn't have the tool before. The owner even confessed that he doesn't like the new ones as much. I'll let you know when I get the diagnosis.

Edited September 11, 2008 by riley6

[Loren]

They need to look at "pending fault codes" -- since it keeps clearing itself.