P1126 and low rpm hesitation - all troubleshooting listed- Help greatly appreciated!

[blue62]

Originally Posted by ike84

Hey fan, glad to hear you're making progress. I could be wrong but I think that p1126 is a lean condition? Your negative fuel trim would support that. If you've got new injectors and good pressure then I would suspect a small leak. I know you said you smoked it but as we all know small leaks can be a pita for even the best to find.

Somebody else chime in on this, I don't wanna steer you wrong.

Sent from my POCOPHONE F1 using Tapatalk

Yes a vacuum leak of some sort has been my thought from the beginning.
Faulty injectors, Faulty O2 sensors, Or a Faulty MAF sensor can all cause a lean situation.
Porschefan has replaced or proven all those things good so I am still betting on a vacuum leak of some kind.

[porschefan76]

Originally Posted by blue62

Yes a vacuum leak of some sort has been my thought from the beginning.
Faulty injectors, Faulty O2 sensors, Or a Faulty MAF sensor can all cause a lean situation.
Porschefan has replaced or proven all those things good so I am still betting on a vacuum leak of some kind.

I am truly hoping this turns out to be vacuum! I will get that smoke machine back on the intake ASAP (weather/plastic window ugg). Thanks again!

[Gilles]

just curious, could a Dry fuel injector Seal could cause a vacuum leak..?
.

[porschefan76]

Originally Posted by Gilles

just curious, could a Dry fuel injector Seal could cause a vacuum leak..?
.

Hi Gilles. Having just replaced all of my fuel injectors, on the fuel rail side, I think you'd have a fuel leak (pressurized fuel rail). On the intake manifold side, I suppose you would have an vacuum leak, yes.

If you have to replace your injectors or o-rings, I used a small amount of the recommended white lithium grease on all of the o-rings and it really made everything go back together nicely and prevents the o-rings from twisting upon insertion. Thanks!

[Gilles]

Thanks for the tip!

[porschefan76]

Originally Posted by Gilles

Thanks for the tip!

No problem! Good luck! Bank 1 injectors are worlds easier to replace than Bank 2 due to tight working quarters with respect to the fuel return line nut.

[porschefan76]

Quick update - all information I am able to find states 17 to 23 inches of HG (8.35 psi to 11.3 psi) for proper intake vacuum. This contradicts the Porsche information I had (5.8psi to 8.7 psi) but I imagine being within a +/- 1 psi might be acceptable.

Only posting this because if I have proper intake vacuum, it seems less likely I have a vacuum leak, so I'm hoping those numbers jump out. If not, I think this leaves me with the EVAP system (electric valve stuck open? but no CEL or code?) and then it's on to mechanical problems with the engine (timing, valve seat issues, compression).

Thanks for your time!