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i just bought a 1999 tdi jetta i got it at a great price because the check engine light is on and its running at low power.... limp mode i assumed. i figured it would be a simple fix so i bought it ..... i tinkered with it for 15 hours yesterday and i'm still having the same issue.
code comes up as p1550 pressure control difference.
when i start the car the light is off for around a minute to a minute and a half it drives with full (or what i'm assuming is full power all 90 hp worth) power and then the engine light comes on and it feels as if its not making any boost. (i can still barely hear the turbo tho.)
first thing i did was change all the vaccum lines.... nothing
then i cleaned the intake (it was horrible) still no change.
i swapped the n75 with the egr regulator (i was told i could do it for testing) this still made no difference
i went back to autozone and had the codes cleared . this time it ran for maybe five minutes before the check engine light went on. i went back up and had the codes re scanned and had the same code p1550
next i unplugged the maf this didnt make too much of a difference. some but not much.
the wastegate actuator is working i hooked it directly to the line (bypassing the n75) while at idle and it sucked the rod down around 1/2 a inch maybe a bit more couldnt see too well just feel.
now i'm frusturated and stumped because i figured itd be a easy fix. it might still be i just cant figure it out.
is it possible for the boost sensor to go bad causing the computer to get confused?
how much vaccum should the system be making?
i went ahead and ordered a new n75 but it wont be here til next week. and i'm pretty sure its not the issue.
any ideas would be greatly appericated.
thanks for taking the time to read this .
code comes up as p1550 pressure control difference.
when i start the car the light is off for around a minute to a minute and a half it drives with full (or what i'm assuming is full power all 90 hp worth) power and then the engine light comes on and it feels as if its not making any boost. (i can still barely hear the turbo tho.)
first thing i did was change all the vaccum lines.... nothing
then i cleaned the intake (it was horrible) still no change.
i swapped the n75 with the egr regulator (i was told i could do it for testing) this still made no difference
i went back to autozone and had the codes cleared . this time it ran for maybe five minutes before the check engine light went on. i went back up and had the codes re scanned and had the same code p1550
next i unplugged the maf this didnt make too much of a difference. some but not much.
the wastegate actuator is working i hooked it directly to the line (bypassing the n75) while at idle and it sucked the rod down around 1/2 a inch maybe a bit more couldnt see too well just feel.
now i'm frusturated and stumped because i figured itd be a easy fix. it might still be i just cant figure it out.
is it possible for the boost sensor to go bad causing the computer to get confused?
how much vaccum should the system be making?
i went ahead and ordered a new n75 but it wont be here til next week. and i'm pretty sure its not the issue.
any ideas would be greatly appericated.
thanks for taking the time to read this .