996T running fine on idle but chokes on load

[2000gt]

Hi guys! I got a 01 996T 6speed that I am having some problems with and would like the help of fellow P-car owners

cars has been sitting for a year. as of late I started working on it. 

have changed the following parts:

-fuel filter

-fuel pump

-spark plugs

-air filter

-new gas

-coolant flush

car did not want to start at first but after changing the plugs it, it started fine.

I dont get any codes. It does run ok on idle put once you apply gas it starts to choke and backfire,even though it will rev to redline no problem. I ran it with and without the MAF on but nothing changed. I took the exhaust off to check for clogged cats but everything was fine. It would still choke and backfire. I also have more than half tank of gas but still read below empty on the fuel gauge.

my next step was to check injectors and check for vacuum leaks or check for fuel pressure...

So has anyone experienced these symtoms before?

What else should i test?

thanks for input towards this problem in advance.

[wross996TT]

When you say you don't get any codes, I assume you have a Durametric/PST2/PIWIS to check...

 

Symptoms sound fuel related...small split in a hose inside the tank?  You say you replaced the fuel pump, did you test the full pressure...could be a shaky install?

 

You also might just make sure your battery is OK if it sat that long.  Battery gremlins on Porsche is...common.  Your fuel gage needs to be recalibrated.  You need to fill it and disconnect/reconnect the battery. (this may be why I suspect battery issues)

 

Others will chime in with their words of wisdom (from 1000 guesses) I'm sure.

[2000gt]

Hi everyone.

I was able to scan the car and get the following codes.

P0056

P0030

P0050

P0161

All are for 02 sensors. The car currently only has 2 02 sensors. Would that mean I now need 02 sensors?

I have switched the MAF around and it didn't change anything,borrowed a friend's MAF.

Car had a buff of black smoke when revved hard and you can easily smell raw fuel-running rich.

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[wross996TT]

Hmmm, should be 4, each bank pre and post cats.  What do you mean "switched the MAF around?  There is only one way to properly install the MAF.

 

In any case, I would check the sensors and the connections, clean them first.

[sportplus997]

I like the torn fuel hose inside the tank..

[2000gt]

I mean I switched it with another working maf from a different car.. This car has the oxygen sensor extensions instead of sensors for the after cats

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