​2019 Porsche 991.2 Turbo S with an E85 tune and 200 CEL cats. Wide open throttle from stop, in 2nd gear i heard a very loud gunshot misfire. YES, it sounded like a real gun shot. ECU faults were just a misfire code on cylinder 1. Deleted it. when driving up hill at WOT I noticed lower than expected power delivery and acceleration. Reached 27 pounds of boost, then I heard another gunshot and also had a misfire code for cylinder 1. After this misfire, power super low - down maybe 60% to 70% but in limp mode- and I had PSM and AWD warnings on. Deleted fault codes. Car drives without any problems but is down minimum 60% in power. I thought I popped off one side of the charge air hoses coming from the turbos/ intercoolers at each of the times I heard the gunshot and now have no boost.
Checked all hoses and I/C end caps. Everything is in order. Logged VTG requested vs actual, is also OK. There is no turbo spool sound at all. Car does not sound as restricted as it usually does, actually sounds better but has hardly any power. There is ZERO boost. Drove it once today to do some logging. At WOT it goes into limp mode and sets AWD and PSM dash warnings.

​Somehow the ECU is limiting power, boost, or throttle opening. I thought that flashing back to the 91 octane file would get rid of the limitation but it did not.

Any idea what to try next?

 

 

I'm clueless and so just the right guy to hazard a useless guess: cracked/blown out intake manifold?

 

The car would pull in extra air and show a misfire code and a lean code. Misfires in that case would stop at higher rpm.

 

Spark plugs may need checking?

 

I'm more interested how you have an e85 tune, and run 27psi as that is well beyond the limits of these cars. Built motor and fuel system with standalone? If so talk to your builder/tuner. If it is stock fuel system, and trying to run e85, then probably went lean and popped something.

 

Can you post all of the codes you're getting? Might help someone on this forum to narrow the cause. An issue like that could have a few different causes and if you're able, get the car up in the air and check all exhaust and intake hoses and bolts. As sirius9 said too, definitely check the sparkplugs for signs of issues.

 

There are no misfires showing while the car is monitored on the Autel.

Porsche fault code 00ED5A.

This for the crankshaft position sensor. I ran a the adaptation procedure with the Autel because I didn't have the VCI for PIWIS with me. The PIWIS procedure is much more involved and needs an open flat road to drive between 1,500 and 2,500 RPM in a high gear for 15 minutes. That is pretty much impossible to find in LA. I need to find a dyno or smog facility that will let me do it. Four wheel dynos are a little harder to find and are usually booked well ahead. I'll check the adaptation status before I'll rent a dyno. If it is "2" it needs adaptation.

 

This shows the data on one page and very easy ly readable. Much better than PIWIS.

The DME is limiting the throttle valve opening to 20.8%. my car is making too much boost. The map sensor cannot read High enough. That leads to data that doesn't make any sense to the DME and it shuts down the throttle body. I need to get a different set of map sensors that can read up the four bar and retune for those map sensors.

 

Don't need a 4w, put the car into dyno mode and throw it on a hub dyno safely.

For e85 I'm guessing you're on motec/cyvex? Iirc they have proprietary logging formats each but can be tapped externally with a laptop. How's the oil looking and what's in your overflow tank after that?