Thread: studder at idle
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Old November 15th, 2019, 05:17   #1
jbuddy
Member
 
Join Date: Sep 2008
Location: Hampton NB
TDI(s): 03 Jetta TDI
Default studder at idle

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
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