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Author Topic: TT225 codes 17705, 17544, and 16891  (Read 970 times)
0h4TTquattro
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« Reply #15 on: June 22, 2019, 05:19:50 AM »

I hope I found the issue. Silicone hoses need to be tighter than I thought. I also replaced all the rubber vacuum lines for, n249, evap and booster. Im still waiting for the new pcv hose. First one was kayser and where they ground the audi logos they compromised the integrity of the pipe.  Ill post back when I find it. 

Im going to fill the system with smoke then pressurize, the low pressure smoke machine I have is worthless, I feel. Ive tried it a number of times.
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Blazius
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« Reply #16 on: June 22, 2019, 08:25:48 AM »

I hope I found the issue. Silicone hoses need to be tighter than I thought. I also replaced all the rubber vacuum lines for, n249, evap and booster. Im still waiting for the new pcv hose. First one was kayser and where they ground the audi logos they compromised the integrity of the pipe.  Ill post back when I find it. 

Im going to fill the system with smoke then pressurize, the low pressure smoke machine I have is worthless, I feel. Ive tried it a number of times.

If you make a diy smoke machine with baby oil , soldering iron and bicycle pump, its more than enough to see if you got a leak.
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0h4TTquattro
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« Reply #17 on: June 22, 2019, 10:01:52 PM »

I have a stinger smoke machine that's regulated to 3/5 psi and it didn't produce enough pressure to show me I had a leaking wastegate actuator or a small leak in one boost hose.  Neither showed up.  There was engine oil leaking from the boost hose that's the only reason I found it and I tested the wastegate actuator with a hand pressure pump to find that. 

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0h4TTquattro
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« Reply #18 on: June 23, 2019, 07:17:53 PM »

The fuel pump is putting out between 20-25 psi.  I checked the fuel pressure on my other car the gauge is accurate.   I was getting misfires at idle once a week as well.
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Blazius
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« Reply #19 on: June 24, 2019, 03:05:53 AM »

The fuel pump is putting out between 20-25 psi.  I checked the fuel pressure on my other car the gauge is accurate.   I was getting misfires at idle once a week as well.

Well time to replace it then.
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0h4TTquattro
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« Reply #20 on: June 24, 2019, 05:17:08 AM »

 If I knew how to log id have found it a long time ago. I find it hard to believe logging is next to useless as suggested. Ive learned more from reading on the vcds help forums than anywhere else. 

The pcv is barely leaking the lean code was the pump.  Requested vs actual was consistent for the most part. It was enough to cause the 17705 code but it still produced 15 psi.
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