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I recently did a 24V timing belt on my brother's Q. I used the cam dies and the crank damper markings to set the timing - no TDC gauge.

The car immediately developed a light stutter/burble that is most evident at partial throttle and light load. At full throttle it isn't noticeable, and the car seems to make full power.

I'm wondering if I should check the timing with dies again, or if it's more likely an injector/coil connector that is rattling on/off with engine vibrations.

The way I see it, the only changes between when it ran fine and when it started stuttering are:

-Checked/set timing
-Disconnected/reconnected coil packs
-Disconnected/reconnected motronic sensor
-Disconnected/reconnected AFM
-Disconnected/reconnected TPS
-Replaced intake runner boots

Thoughts? Oh, and I guess it's my 164Q now. It's nice to have a 164 again.
 

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use brake cleaner and check for tramp air leaks at all intake runners/AFM hose/vacuum lines/IAC connection/Oil separator etc
 

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How does it run if you unplug the AFM and drop it into default mode? If it runs fine then you know it is a sensor issue. If not you know it is a hardware fault - i,e. cam timing, air leak, etc.

Good luck,

Richard
 
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