S4 codes... Please Help!!!!
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1st Gear
Joined: Jun 2006
Posts: 20
S4 codes... Please Help!!!!
Hi, I've been having problems with my 2001 S4. The problem is as follows, as soon as you floor the throtle the car get's 20psi boost, if you hold it at full throtle for more than three seconds, the boost cuts off and remains at 5psi. After some time (5min) of driving, something happens where it finanlly boost to 20psi again. And then again, 20psi for 3 seconds and then 5psi for five minutes untill something resets and allows me to boost at 20psi. There are no leaks. It's been pressure tested. It has to be something electrical because it cuts my boost down and remains that way untill it resets. Here are the codes from a VAG.
17963 - Charge Pressure: Maximum Limit Exceeded
[/align] P1555 - 35-00 - -
[/align]17884 - EVAP Leak Detection Pump: Insufficient Vacuum
[/align] P1476 - 35-10 - - - Intermittent
[/align]
[/align]It has brand new K03's, brand new wastegates, new wastegate vaccum lines. Everything started happening after I put in the new turbos. With my old K03's I was boosting 15psi and now with the new turbos it goes up to 20psi but like I said only for three seconds at a time. Please help me.
[/align]
[/align]Could it be the ecu, MAF, O2 sensors, orginal boost controller N75, ??????
[/align]
[/align]I'm quessing since with the old turbos it was boosting 15psi and now with the new turbos it's boosting 20psi, something doesn't like the extra 5psi and tells the ecu to go into like a safe mode or something?
[/align]
[/align]Thank you in advance for taking the time to help me out.
17963 - Charge Pressure: Maximum Limit Exceeded
[/align] P1555 - 35-00 - -
[/align]17884 - EVAP Leak Detection Pump: Insufficient Vacuum
[/align] P1476 - 35-10 - - - Intermittent
[/align]
[/align]It has brand new K03's, brand new wastegates, new wastegate vaccum lines. Everything started happening after I put in the new turbos. With my old K03's I was boosting 15psi and now with the new turbos it goes up to 20psi but like I said only for three seconds at a time. Please help me.
[/align]
[/align]Could it be the ecu, MAF, O2 sensors, orginal boost controller N75, ??????
[/align]
[/align]I'm quessing since with the old turbos it was boosting 15psi and now with the new turbos it's boosting 20psi, something doesn't like the extra 5psi and tells the ecu to go into like a safe mode or something?
[/align]
[/align]Thank you in advance for taking the time to help me out.
Member
Joined: Sep 2006
Posts: 36
RE: S4 codes... Please Help!!!!
17963 is saying your boosting too high, which we already know because your boosting to 20psi.
And its probably related to 17884 some how. The Leak Detection Pump is located in the left rear wheel well behind the fender liner. It monitors to see if theres a leak in the system. Theres a rubber reed inside that moves up and down and opens and closes and is tests for leaks. Its saying theres insufficient vacuum which means the vacuum line that hooks up the pump which the pump receives its signal off of isnt getting strong enough vacuum pressure.
This problem is not electrical related, or atleast i highly doubt it. When the car boosts to 20psi its throwing that charge pressure code which is putting the car in limp mode for a short period of time to protect you from over boosting and causing detonation or damage to the turbos and motor, that is why you can only boost to 5psi after this occurs.
Id say maybe you have one of the vacuum lines on the waste gates hooked up wrong which are allowing the turbos to spool to infinity. There can also be something wrong between the lines off the intake manifold and to the Leak detection pump. When you do a pressure test, it doesnt test every single vacuum line on the car, it just tests the common leaks.
Theres a line that comes off a nipple off the back of the intake manifold, it goes into a 4 way check valve(which may be malfunctioning) One of the lines off the four way check valve goes into a hard plastic line which runs along the driver valve cover which then loops around into a rubber line, then turns back into a hard line and goes into the driver front fender well. If you take the driver fender liner out you'll see the hard line that goes into a Vacuum Resevoir, which then T's off and goes to the Leak detection pump. I would check this line thourougly because something is likely wrong along this path.
Another possibility is theres a leak somewhere along the path to the leak detection pump and the turbos are overspooling to make up for the slight loss you have.
I'd be willign to bet these two codes are related somehow.
And its probably related to 17884 some how. The Leak Detection Pump is located in the left rear wheel well behind the fender liner. It monitors to see if theres a leak in the system. Theres a rubber reed inside that moves up and down and opens and closes and is tests for leaks. Its saying theres insufficient vacuum which means the vacuum line that hooks up the pump which the pump receives its signal off of isnt getting strong enough vacuum pressure.
This problem is not electrical related, or atleast i highly doubt it. When the car boosts to 20psi its throwing that charge pressure code which is putting the car in limp mode for a short period of time to protect you from over boosting and causing detonation or damage to the turbos and motor, that is why you can only boost to 5psi after this occurs.
Id say maybe you have one of the vacuum lines on the waste gates hooked up wrong which are allowing the turbos to spool to infinity. There can also be something wrong between the lines off the intake manifold and to the Leak detection pump. When you do a pressure test, it doesnt test every single vacuum line on the car, it just tests the common leaks.
Theres a line that comes off a nipple off the back of the intake manifold, it goes into a 4 way check valve(which may be malfunctioning) One of the lines off the four way check valve goes into a hard plastic line which runs along the driver valve cover which then loops around into a rubber line, then turns back into a hard line and goes into the driver front fender well. If you take the driver fender liner out you'll see the hard line that goes into a Vacuum Resevoir, which then T's off and goes to the Leak detection pump. I would check this line thourougly because something is likely wrong along this path.
Another possibility is theres a leak somewhere along the path to the leak detection pump and the turbos are overspooling to make up for the slight loss you have.
I'd be willign to bet these two codes are related somehow.
Thread Starter
|
1st Gear
Joined: Jun 2006
Posts: 20
RE: S4 codes... Please Help!!!!
ORIGINAL: pane2k
17963 is saying your boosting too high, which we already know because your boosting to 20psi.
And its probably related to 17884 some how. The Leak Detection Pump is located in the left rear wheel well behind the fender liner. It monitors to see if theres a leak in the system. Theres a rubber reed inside that moves up and down and opens and closes and is tests for leaks. Its saying theres insufficient vacuum which means the vacuum line that hooks up the pump which the pump receives its signal off of isnt getting strong enough vacuum pressure.
This problem is not electrical related, or atleast i highly doubt it. When the car boosts to 20psi its throwing that charge pressure code which is putting the car in limp mode for a short period of time to protect you from over boosting and causing detonation or damage to the turbos and motor, that is why you can only boost to 5psi after this occurs.
Id say maybe you have one of the vacuum lines on the waste gates hooked up wrong which are allowing the turbos to spool to infinity. There can also be something wrong between the lines off the intake manifold and to the Leak detection pump. When you do a pressure test, it doesnt test every single vacuum line on the car, it just tests the common leaks.
Theres a line that comes off a nipple off the back of the intake manifold, it goes into a 4 way check valve(which may be malfunctioning) One of the lines off the four way check valve goes into a hard plastic line which runs along the driver valve cover which then loops around into a rubber line, then turns back into a hard line and goes into the driver front fender well. If you take the driver fender liner out you'll see the hard line that goes into a Vacuum Resevoir, which then T's off and goes to the Leak detection pump. I would check this line thourougly because something is likely wrong along this path.
Another possibility is theres a leak somewhere along the path to the leak detection pump and the turbos are overspooling to make up for the slight loss you have.
I'd be willign to bet these two codes are related somehow.
17963 is saying your boosting too high, which we already know because your boosting to 20psi.
And its probably related to 17884 some how. The Leak Detection Pump is located in the left rear wheel well behind the fender liner. It monitors to see if theres a leak in the system. Theres a rubber reed inside that moves up and down and opens and closes and is tests for leaks. Its saying theres insufficient vacuum which means the vacuum line that hooks up the pump which the pump receives its signal off of isnt getting strong enough vacuum pressure.
This problem is not electrical related, or atleast i highly doubt it. When the car boosts to 20psi its throwing that charge pressure code which is putting the car in limp mode for a short period of time to protect you from over boosting and causing detonation or damage to the turbos and motor, that is why you can only boost to 5psi after this occurs.
Id say maybe you have one of the vacuum lines on the waste gates hooked up wrong which are allowing the turbos to spool to infinity. There can also be something wrong between the lines off the intake manifold and to the Leak detection pump. When you do a pressure test, it doesnt test every single vacuum line on the car, it just tests the common leaks.
Theres a line that comes off a nipple off the back of the intake manifold, it goes into a 4 way check valve(which may be malfunctioning) One of the lines off the four way check valve goes into a hard plastic line which runs along the driver valve cover which then loops around into a rubber line, then turns back into a hard line and goes into the driver front fender well. If you take the driver fender liner out you'll see the hard line that goes into a Vacuum Resevoir, which then T's off and goes to the Leak detection pump. I would check this line thourougly because something is likely wrong along this path.
Another possibility is theres a leak somewhere along the path to the leak detection pump and the turbos are overspooling to make up for the slight loss you have.
I'd be willign to bet these two codes are related somehow.
I'll check the vacuum lines just like you said on wednesday and i'll let you know. I had no idea they were in the wheel well.
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