12-25-2021, 06:30 AM | #24 |
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Also got that damn 101F01 code couple weeks ago. It appeared after my valcetronic adaptation. I did adaption because had 133E10 fault which was described that my vvt is deactivated. Right after activation 101F01 came on. Tried to smoke test… no leaks were detected. Then I tried to swich MAP sensors. Nothing. Also tried to clean my VANOS solenoids. Still nothing. Also changed my valve cover. Also resetted adaptions of DME. Maybe car idles a bit smoother but still have roughness on idling and check engine light. Didnt checked boost solenoid yet. Noticed that my MAP sensor before TB shows about 1013hPa and MAP sensor after TB shows about 960hPa. Is that bad or it should be different numbers? Still cant find out whats the matter lol
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01-03-2022, 03:37 AM | #25 |
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I finally got around to doing a smoke test on the inlet tract after buying a smoke tester from Amazon and found a leak at the manifold gasket between the manifold and the head. All other locations were OK so ordered a new set of manifold gaskets, TB to manifold gasket and the DME gasket (just in case). I think this was the problem all along but never suspected a leak in this location as I replaced them a year earlier when I did the oil housing gaskets. The leak at the PCV was probably contributing to the problem so replacing it was a good maintenance task given the age of the car (2013). I did waste some money buying the sensor though. Lesson I learned was that doing a smoke test should be one of the first things you do if you get boost or lean codes.
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01-03-2022, 07:21 AM | #26 | |
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01-03-2022, 10:27 AM | #27 |
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If you disconnect the valvetronic connector the dme will default to using the TB like most cars. The drop in pressure is normal when using the TB instead of valvetronic. The valvetronic system is supposed to be better for economy and smoother but it sounds like its not working properly. I did get a valvetronic fault code a year ago and had the dealer do the learn process as I did not have ISTA setup on my laptop and have not seen the code since. Maybe try and do the learn process again using ISTA?
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01-03-2022, 03:07 PM | #28 | |
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01-04-2022, 10:41 AM | #29 | |
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01-04-2022, 11:46 AM | #30 | ||
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Yes, MAP sensors has different values (atmospheric and chargepipe measures about 1010hPa and manifold measures about 950hPa(valvetronic enabled)). When I disable valvetronic(disconnecting servomotor switch) atmospheric and chargepipe pressure is still same 1010hPa, but manifold pressure drops about to 300hPa. All measures shown when engine is idling. When valvetronic is enabled car misfires, runs roughly, when disabled, runs fine and fault code 101F01 is gone. Any thoughts? |
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01-04-2022, 12:01 PM | #31 | |
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01-04-2022, 12:10 PM | #32 | ||
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01-06-2022, 03:55 AM | #33 |
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I still think that you have a vacuum leak around the intake tract. 101F01 is a lean condition code and its mostly due to unmetered air entering the system after the MAF from a leak in the intake tract or crankcase ventilation system. You mentioned that a smoke test was done before but I would try again in multiple locations. If you changed the VC then you probably don't need to check this for a leak. I did a smoke test before the turbo and then did one at the charge pipe and only found my leak in the second test. Also don't use too much pressure during the smoke test, particularly if you include the crankcase as the PCV valve is delicate. I used a smoke tester with a 1 psi regulator as I was paranoid about the PCV as I also replaced the VC recently.
It is also possible that the high pressure fuel pump maybe not providing enough pressure but this is less likely. I would also check the MAP sensors before you start the car as was suggested earlier to confirm that they are reading correctly just in case one is faulty. They (there are three of them) should all be reading atmospheric pressure. |
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01-06-2022, 10:53 AM | #34 | |
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But how about high pressure fuel pump? I think that firstly I need to check fuel rail pressure, but dont know what numbers of measurements show good/bad condition of HPFP. But still, dont forget that I dont have any issues when valvetronic is switched off! Also met one person with same fault code and he decided to replace vvt sermomotor and eccentric shaft. It didnt solve the problem so I think that valvetronic works fine in my car and it is not the issue which causes 101F01 fault code. |
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01-06-2022, 12:12 PM | #35 |
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A vaccuum leak might show up under a low pressure smoke test but you really need to test to ~20psi if you want to check for a boost leak post-turbo. If you do this and you test using the inlet you need to disconnect the CCV hose and plug it so its not connected to the VC.
HPFP "partially failing" is very very unlikely as it is mechanical. You just check rail pressure vs target pressure. |
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01-06-2022, 01:09 PM | #36 | |
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01-06-2022, 01:20 PM | #37 | |
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If you are checking for a "boost leak" you need to test to 20+ psi because tuned you will run that amount of boost and can get surges even higher when the TB closes. Testing to only a few psi may not reveal a leak that appears under full boost. But you dont want to send 20+ psi into the CCV hose. I've really only done a "boost leak" test and for that i test by putting pressure into the inlet with the CCV hose disconnected from the VC and plugged. That way you are testing all the way from the turbo inlet to the engine but not pressurizing the crank case. |
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01-06-2022, 01:33 PM | #38 | ||
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01-06-2022, 07:41 PM | #39 |
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I think (but am not certain) that when you disable valvetronic the DME goes into open loop mode and doesn't use the O2 sensors for A/F adjustment and uses a fixed fuel map. This may explain why your car gets smoother as the A/F generally goes rich which would smooth out your idle but will increase fuel consumption. You mentioned your problems are at idle so I still think the problem is a vacuum leak as the intake pressure is a vacuum at idle.
When I did my two smoke tests I plugged up the intake in between the air filter and the turbo inlet using a glove and pumped smoke into the crankcase ccv pipe which connects to the VC. I saw a little smoke coming from the manifold area. I then reconnected the CCV pipe and then pumped smoke into the charge pipe by removing the MAP sensor and sticking the smoke pipe in there. The smoke from the manifold area became more obvious around the manifold itself although I could not pinpoint the leak. There are many videos on YT which show how to do this. The gaskets have now arrived so I will be replacing them as soon as the snow melts around my car. Also found a few videos on YT which show how to remove the manifold. |
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01-06-2022, 11:12 PM | #40 | |
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01-12-2022, 01:25 AM | #41 |
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Just an update on my 101F01, 118001, etc codes. Finally resolved the problem by replacing the manifold gaskets. Smoke test revealed leaks around the manifold. Removed the manifold and found that I must of damaged the manifold last time I replaced the gaskets although the damage (caused by using a pick to remove the gaskets) looked minor and did not cause a problem for over a year. I bought a used manifold from a wrecker and replaced the gaskets as well as the DME and the TB gaskets. Cleared old codes and restarted the car. Was immediately smoother on the cold start compared to before the repair even after two weeks out in the winter cold. Went for a test drive and re checked for codes. No codes so job done.
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01-12-2022, 11:39 AM | #42 | |
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08-19-2022, 11:10 AM | #43 | |
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08-19-2022, 12:50 PM | #44 |
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