Hi everyone,
My names John, I have recently bought myself a 2004 Mk1 Leon Cupra R BAM. Paid just £1400 for it which is cheap, its in fairly good condition for its age however it was cheap because it has boost issues, I am confident home mechanic, being able to do clutches, head rebuilds, all suspension, brakes etc so I thought it would just be a sensor or something simple.
It starts fine hot or cold, runs fine etc just no boost, its just flat and wont rev over 5000ish rpm.
So first thing I did was plug it into my OBD reader and it was coming up with a Coolant temp sensor fault and Lambda Sensor 1 bank 1 fault.
I got a new temp sensor and fitted it that cleared that code, and I fitted a new lambda sensor but the code came back again and still no boost. So thought well I'll try a few other sensors to see if that does anything.
Changed MAF sensor, MAP sensor, N75 valve, N249 valve (has been bypassed but still plugged in), checked the fusebox on the inside of the drivers door but not sure if theres another fusebox to check? But still no boost. It sometimes boosts to 0.5 bar for a few seconds but then cuts again, and I have had it boosting at 1.5 bar once or a second but cut again. When I got it, the nuts on the actuator were loose so I tightened them, not sure if theyre in the wrong place its possible for it to not boost at all? Ive tried adding preload and playing with it but no luck.
So I'm back to the Lambda sensor, tried 2 second hand sensors now both working in previous cars and then Ive tried a brand new one from Euro Car Parts and still throwing up a code, sometimes itll come up with P0030, sometimes P0031 and sometimes P0032. All wiring looks to be fine, it still has the cats in so not because of a decat but it has been remapped. The guy had it running fine up until a few weeks before i got it, I also know the person who owned it before the guy i bought it from too and he said its not changed since he had it and it was fine when he had it too.
So where do i go from here, im stuck. Had the full front end stripped, checked for any leaks or splits in intercoolers and boost pipes and vac lines etc and all ok.
Any ideas or help would be appreciated as I want to get out and enjoy it!
My names John, I have recently bought myself a 2004 Mk1 Leon Cupra R BAM. Paid just £1400 for it which is cheap, its in fairly good condition for its age however it was cheap because it has boost issues, I am confident home mechanic, being able to do clutches, head rebuilds, all suspension, brakes etc so I thought it would just be a sensor or something simple.
It starts fine hot or cold, runs fine etc just no boost, its just flat and wont rev over 5000ish rpm.
So first thing I did was plug it into my OBD reader and it was coming up with a Coolant temp sensor fault and Lambda Sensor 1 bank 1 fault.
I got a new temp sensor and fitted it that cleared that code, and I fitted a new lambda sensor but the code came back again and still no boost. So thought well I'll try a few other sensors to see if that does anything.
Changed MAF sensor, MAP sensor, N75 valve, N249 valve (has been bypassed but still plugged in), checked the fusebox on the inside of the drivers door but not sure if theres another fusebox to check? But still no boost. It sometimes boosts to 0.5 bar for a few seconds but then cuts again, and I have had it boosting at 1.5 bar once or a second but cut again. When I got it, the nuts on the actuator were loose so I tightened them, not sure if theyre in the wrong place its possible for it to not boost at all? Ive tried adding preload and playing with it but no luck.
So I'm back to the Lambda sensor, tried 2 second hand sensors now both working in previous cars and then Ive tried a brand new one from Euro Car Parts and still throwing up a code, sometimes itll come up with P0030, sometimes P0031 and sometimes P0032. All wiring looks to be fine, it still has the cats in so not because of a decat but it has been remapped. The guy had it running fine up until a few weeks before i got it, I also know the person who owned it before the guy i bought it from too and he said its not changed since he had it and it was fine when he had it too.
So where do i go from here, im stuck. Had the full front end stripped, checked for any leaks or splits in intercoolers and boost pipes and vac lines etc and all ok.
Any ideas or help would be appreciated as I want to get out and enjoy it!
