Hi,

I have a 2010 porsche panamera(970) 4.8 V8 400 hp.I was short test of scan tools and the following codes are: P1583, P0301, P0302, P0300
I was change the spark plugs with ignition coil and camshaft position sensor
I was clean up the the assembly injectors.
The engine has always got at trouble codes as mention above.
Now all of that was executed but the engine is still on misfiring at the 4000 RPM.
Do i need to touch the troutle body and other possible regulator basic adjustment?
I really need your advise what we can do regarding of this trouble.

 

Hello Asihara! did you fix the panamera? i have the same issue!

 

Usually if a single plug or coil is bad it'll only flag a single cylinder. The fact that it is reporting multiple cylinders on multiple banks it seems more likely it is related to a boost leak or air flow sensor problem.

 

So you have replaced the coils or did you find a a leaking area?

 

On the Panamera I've had a single failed coiled that I've replaced successfully. It reported the specific cylinder that failed as a misfire code.

I've not had the specific problem you've mentioned on the Panamera, but have on other cars. Just using process of elimination based on the information provided and error codes. Also, I called it a boost leak (thinking turbo cars), but your leak is likely after the airflow sensor but prior to entering the head given it's N/A.

 

In my case I have 1.2,3 cylinders misfiring after 4000 rpms.
I have replaced the coils,sparks plugs cam sensors for both banks ,fuel injectors and high pressure pump and the misfiring is still there!😐

 

I believe if it was coil/spark plug or one of those sensors you would have gotten a specific code for the sensor or cylinder. I believe you are losing air after the airflow sensor but prior to entering the engine. I'd do a leak check. If someone follows behind you do they see black smoke above 4000 rpm? That would be a further indication it's adding fuel for air that isn't there. If you have access to check Air Fuel Ratio that is another one to check. Not sure what tools you have available. Air leak/looking for abundance of air is a pretty cheap thing to check before replacing more parts.

 

The misfires it's also when the car is stationary , I don't have a black smoke behind! The car is working with map sensor ! I have done a smoke test with zero leaks!

 

My car had an air leak and threw error code P038 (?) that mystified my indy. He ran all kinds of tests and had never seen a failure of this type before despite commonality w/ CTT's. Turns out the failure was a tank vent valve (P/N 948 110 020 74) which was leaking vacuum and boost intermittently.

Following subsequent testing they also replaced the Vent Tube (P/N 248 107 229 75) and after that I have had no issues and no more error messages. Car has Vivid tune and IPD plenum and pulls like a freight train again.

This involved quite a bit of diagnostic work and troubleshooting - I hope yours is much easier to fix and that this info may help you out. BTW, my car was 10 years old and 62k miles at the time of this incident.

 

Did you manage to find what was the issue and fix it?

 

What code(s) do you have, Paul? You said you have 1, 2 and 3 misfiring. Are you certain? From the radiator: passenger side - 1,2,3,4, pass side 5,6,7,8

Edit - sorry for the bad info earlier. MrTutis set me straight

 

Hmm, I have a repair manual and for the V6 it calls cylinders 1 2 3 (left side) and 4 5 6 (right/driver side). But I've seen that some mechanics are numbering then differently too. Where did you find that sequence?

 

According to AllData and post #48 on this thread, the 6 is numbered 1/3/5 and 2/4/6. You are correct on the 8

 

Weird, because V8 and V6 seem to be identical. Also here - https://www.6speedonline.com/forums/...ring-oder.html is different sequence. Omg, how come there are so many different interpretations...

Do you have alldata account? Is it worth buying? I have 16000 pages pdf that seems pretty detailed with everything, but now I'm getting sceptical about that

 

The V6 order in the post I linked doesn't make sense when comparing to the firing order. Firing all three cylinders (in a row) on one side seems like a bad way to design a V engine...

Anyways if you are having misfire under high load acceleration it is suggested to check/clean the intake valves of carbon build up.

Official tool:

https://porsche.snapon.com/special-t...temId=66390123

It notes Walnut Shell (24 Grit Fine) as the stuff to use, walnut shell also referred to by @NormalFellow (who's been sorely missed around here)...