jbuddy
Well-known member
I replaced my fuel pump on my standard 2003 jetta alh with an 11mm pump and now the car idles really rough most of the time. Group 1 IQ shows 0.8
I tried adjusting the IQ with vcds to bring it up but just made it worse so
put it back to stock. I changed fuel filter and preheater valve as well.
Did a diesel purge. I"m puzzled, any ideas what I should try next.
thanks
I tried adjusting the IQ with vcds to bring it up but just made it worse so
put it back to stock. I changed fuel filter and preheater valve as well.
Did a diesel purge. I"m puzzled, any ideas what I should try next.
thanks