just completed the timing belt job for my 1.8T a4 quattro and the engine has a rough idle. I believe my timing is correct as I carefully did everything and made sure nothing moved.

Any experience or solutions to this problem?

 

Just double check everything, vacuum lines, boost hoses, electrical grounds etc. Should be something stupid like that. Have you driven it yet?

 

not yet....still up on jacks

 

more info.....

i ran the engine for like 15 secs with out coolant and everything good with rough idle only in park


then i attached the service carriage everything, refill with coolant and ran the engine again and start having more rough idle

 

disconnected the battery for 15 mins and reconnect it and put key in ignitiong for 20mins(i heard that may help)

now the idle is slightly "bouncing" and not surging as before.


I also have a CEL(P0137) which is low voltage for one of my o2 sensors
Since one of my o2 sensors is malfunctioning, could that be giving the wrong fuel/air mxture to the ecu/engine.
Could this also be the problem??

 

hey guys, i think i got the same problem. my s4 b5 won't start after i changed the t-belt.

 

started the car this morning and everything is running good

last night i let the car idle by itself for like ten mins and rev it at 1-2k rpm for a few mins

i guessing the throttle body ned to align itself(not sure as im a noob, lol)