Hello!
I have just bought myself a Seat Leon Mk1 FR with the 180hp 1.8t and this is my first car. I'm quite mechanically inclined and have some background working with cars, but no turbo stuff. I see this forum has a lot of knowledgeable people so thought I'd ask here.
I drove my car home from another city in Finland and did some aggressive city driving reaching 9.5l/100km on the computer. Then a couple days after I got a yellow check engine light and it felt like I lost some power. Also I think this is when a louder whining noise started coming out of the engine after 2.5krpm suggesting a boost leak? Also after this I've never again managed to get it under 10.5 l/100km even on highway trips, but I'm not sure if I'll just have to blame myself for that. I got myself a vagcom and it gave me 4 faults, SAI incorrect flow, N249 mechanical malfunction, clutch pedal sensor fail and running too lean. Cleared the codes and only the N249 fail persisted and occasionally the SAI code came back as well. I decided to measure requested and measured boost with vagcom and took some graphs. If I'm correct there is 2 measurement values and 2 target values which are all in the picture. Red and yellow represent the requested amount and green/gray the measured values. I first went through the gears, then did a pull in 6th and then one in 5th. I linked the picture below, delete the space after https
https ://i.imgur.com/JuoXrne.png
So is there 2 sensors in the system measuring boost pressure? the scale is from 500 to 2500mbar in the picture, so the actual boost seems to be around 0.2bar below the requested amount, I don't think it's normal. Also the requested boost never really goes over 0.8bar but I've heard some of these cars boost way higher. What's a typical number?
I thought of doing the N249 delete to remedy the issues possibly caused by it malfunctioning but I read that it lowers mpg in the city. Has anyone experienced such effects?
And lastly, am I the only one with an oil pressure warning going off everytime I creep forward at 1.6-1.9 krpm? It goes away as soon as I rev higher or drop down to idle, but when I'm going slow around intersections or slow traffic it keeps going off. The seller told me this might be an issue with the oil pressure sensor but the way it behaves seems weird to me.
Overall I'm happy with my purchase, just hoping to get the most out of it with some tinkering. Thanks to all the awesome forumspeople for help!
I have just bought myself a Seat Leon Mk1 FR with the 180hp 1.8t and this is my first car. I'm quite mechanically inclined and have some background working with cars, but no turbo stuff. I see this forum has a lot of knowledgeable people so thought I'd ask here.
I drove my car home from another city in Finland and did some aggressive city driving reaching 9.5l/100km on the computer. Then a couple days after I got a yellow check engine light and it felt like I lost some power. Also I think this is when a louder whining noise started coming out of the engine after 2.5krpm suggesting a boost leak? Also after this I've never again managed to get it under 10.5 l/100km even on highway trips, but I'm not sure if I'll just have to blame myself for that. I got myself a vagcom and it gave me 4 faults, SAI incorrect flow, N249 mechanical malfunction, clutch pedal sensor fail and running too lean. Cleared the codes and only the N249 fail persisted and occasionally the SAI code came back as well. I decided to measure requested and measured boost with vagcom and took some graphs. If I'm correct there is 2 measurement values and 2 target values which are all in the picture. Red and yellow represent the requested amount and green/gray the measured values. I first went through the gears, then did a pull in 6th and then one in 5th. I linked the picture below, delete the space after https
https ://i.imgur.com/JuoXrne.png
So is there 2 sensors in the system measuring boost pressure? the scale is from 500 to 2500mbar in the picture, so the actual boost seems to be around 0.2bar below the requested amount, I don't think it's normal. Also the requested boost never really goes over 0.8bar but I've heard some of these cars boost way higher. What's a typical number?
I thought of doing the N249 delete to remedy the issues possibly caused by it malfunctioning but I read that it lowers mpg in the city. Has anyone experienced such effects?
And lastly, am I the only one with an oil pressure warning going off everytime I creep forward at 1.6-1.9 krpm? It goes away as soon as I rev higher or drop down to idle, but when I'm going slow around intersections or slow traffic it keeps going off. The seller told me this might be an issue with the oil pressure sensor but the way it behaves seems weird to me.
Overall I'm happy with my purchase, just hoping to get the most out of it with some tinkering. Thanks to all the awesome forumspeople for help!
