joo070772
New member
- Location
- Campbell, CA
- Car(s)
- 2009 VW MK5 GTI TSi
Hello,
After registering for the first time, there is a problem with my 09 GTI TSi, so I post it.
2009 MK5 GTI TSi 127,XXXmiles & 6MT 5 doors.
Around April 2020, due to air intake problem:
+ April, 2020:
Replaced: Intake Manifold (3 times) + Cleaned the carbon build up + Fuel Injection System + Throttle Body + Spark Plugs including ignition coils.
I have a problem since a month ago, it's a long story.
+Idle hunting:
I checked that the RPM went down late when the car stopped, and after parking,
I stepped on the accelerator and it went down like an RPM hunting (No CEL).
The following day, the same symptoms were repeated when going to work, and the CEL was turned on.
1. Generic OBD2 reader: P0100 & P0507 -> Replaced new OEM MAF sensor then, cleared codes by myself.
2. After starting, RPM is unstable and the above symptoms appeared and CEL was back on: P0100 & P0507 & P0171.
3. Went to VW Speciality shop:
The owner replaced the Mass Air Flow sensor first (Throttle Body Side), and the MAF sensor was replaced.
And the problem is still existed -> CEL P0100 was ON.
Because it was a strange same symptom above, so the MAF sensor connector and wires were replaced but the P0100 kept turning on & PCV repaired (Not replaced whole new one).
4. If cleared P0100 with VCDS/VAC-COM, causing RPM to become unstable and stalled.
3 weeks ago, the owner couldn't find what the problem was,
So I took over the car because there was no problem operation with the CEL going around with the lights on.
The owner said there could be a problem with the PCM (He was not sure), which he couldn't solve & he said that just drive it.
5. I checked and erased CEL several times few days after took over.
The engine didn't turn off (if CEL deleted), so far and the car shook a little bit and the CEL turned on again after re-starting.
I can drive even if I remove the CEL now, but the car is a little shaky, and when the CEL is lit, RPM Hunting is created likely above, but nothing is rattling.
6. Since last week, the idle hunting has gotten worse (CEL), so visited another VW shop urgently.
They replaced both the PCV valve and the ignition coil + Spark Plugs (They told me that it's black color) with a new one, and after the test drive,
The above CEL came out again, first removing the PCV valve breather hose, then blocking the air intake port (pictured).
According to them, the Diverter valve is OK.
And then everything goes back to normal (no CEL).
They asked to get an oil catch can quickly.
This is California, so if I use the oil catch can, there is a problem with smoke test.
My question is:
Connecting the PCV valve breather hose to the air inlet:
1. Misfires.
2. Vacuum leak occurred.
If disconnect the PCV valve breather hose to the air inlet, all back to a normal.
It's drivable.
Here are some CEL Codes I noticed:
4 weeks ago:
P0100 & P0507 & P0171.
01.29.2021.
P0606 & 0101 & 0507 & 2279 & 0171.
Cleared and P0101 & 2279 again.
Cleared and P0101 & 0507 again.
01.30.2021.
Cleared and P0101 again.
Cleared and P2279 & 0101 & P0171 & 0507 again.
01.31.2020.
Cleared and P0101 & P0171 & P0507 again.
I understand that has to be rescanned on it however just wanted to get some tips.
Cause I spent over $4K since 2020 @ another 2 of VW shops.
I don't know what to do.
Be safe & healthy.
Regards
Joel J Benedict Lee
After registering for the first time, there is a problem with my 09 GTI TSi, so I post it.
2009 MK5 GTI TSi 127,XXXmiles & 6MT 5 doors.
Around April 2020, due to air intake problem:
+ April, 2020:
Replaced: Intake Manifold (3 times) + Cleaned the carbon build up + Fuel Injection System + Throttle Body + Spark Plugs including ignition coils.
I have a problem since a month ago, it's a long story.
+Idle hunting:
I checked that the RPM went down late when the car stopped, and after parking,
I stepped on the accelerator and it went down like an RPM hunting (No CEL).
The following day, the same symptoms were repeated when going to work, and the CEL was turned on.
1. Generic OBD2 reader: P0100 & P0507 -> Replaced new OEM MAF sensor then, cleared codes by myself.
2. After starting, RPM is unstable and the above symptoms appeared and CEL was back on: P0100 & P0507 & P0171.
3. Went to VW Speciality shop:
The owner replaced the Mass Air Flow sensor first (Throttle Body Side), and the MAF sensor was replaced.
And the problem is still existed -> CEL P0100 was ON.
Because it was a strange same symptom above, so the MAF sensor connector and wires were replaced but the P0100 kept turning on & PCV repaired (Not replaced whole new one).
4. If cleared P0100 with VCDS/VAC-COM, causing RPM to become unstable and stalled.
3 weeks ago, the owner couldn't find what the problem was,
So I took over the car because there was no problem operation with the CEL going around with the lights on.
The owner said there could be a problem with the PCM (He was not sure), which he couldn't solve & he said that just drive it.
5. I checked and erased CEL several times few days after took over.
The engine didn't turn off (if CEL deleted), so far and the car shook a little bit and the CEL turned on again after re-starting.
I can drive even if I remove the CEL now, but the car is a little shaky, and when the CEL is lit, RPM Hunting is created likely above, but nothing is rattling.
6. Since last week, the idle hunting has gotten worse (CEL), so visited another VW shop urgently.
They replaced both the PCV valve and the ignition coil + Spark Plugs (They told me that it's black color) with a new one, and after the test drive,
The above CEL came out again, first removing the PCV valve breather hose, then blocking the air intake port (pictured).
According to them, the Diverter valve is OK.
And then everything goes back to normal (no CEL).
They asked to get an oil catch can quickly.
This is California, so if I use the oil catch can, there is a problem with smoke test.
My question is:
Connecting the PCV valve breather hose to the air inlet:
1. Misfires.
2. Vacuum leak occurred.
If disconnect the PCV valve breather hose to the air inlet, all back to a normal.
It's drivable.
Here are some CEL Codes I noticed:
4 weeks ago:
P0100 & P0507 & P0171.
01.29.2021.
P0606 & 0101 & 0507 & 2279 & 0171.
Cleared and P0101 & 2279 again.
Cleared and P0101 & 0507 again.
01.30.2021.
Cleared and P0101 again.
Cleared and P2279 & 0101 & P0171 & 0507 again.
01.31.2020.
Cleared and P0101 & P0171 & P0507 again.
I understand that has to be rescanned on it however just wanted to get some tips.
Cause I spent over $4K since 2020 @ another 2 of VW shops.
I don't know what to do.
Be safe & healthy.
Regards
Joel J Benedict Lee