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sacred screw and alternate throttle bodies

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Pescatore:
Does it idle rough at any engine temperature?
Maybe it's not TB related.

blackcat:
I would start with the easy stuff first, adjust the valves and have you tried balancing the throttle bodies? Do you have Guzzidiag and have you reset the TPS?  I disconnected the stepper motor on my 07 Norge around 08 and never had a problem adjusting the idle.

Kaladin:

--- Quote from: Pescatore on November 07, 2025, 09:59:03 PM ---Does it idle rough at any engine temperature?
Maybe it's not TB related.

--- End quote ---
Yes, at any temperature.

Kaladin:

--- Quote from: blackcat on November 08, 2025, 06:31:23 AM ---I would start with the easy stuff first, adjust the valves and have you tried balancing the throttle bodies? Do you have Guzzidiag and have you reset the TPS?  I disconnected the stepper motor on my 07 Norge around 08 and never had a problem adjusting the idle.

--- End quote ---
I have reset the TPS and changed the inner spark plugs.   I'll try balancing the throttle bodies today after the game.

Bison:
Hello folks,
If the sacred screw has been played around with would both the plugs be the same colour?
If you have done all the above you could try the CO2 trim?. My 2007 was snatchy at low revs and the gearbox clattered at idle. I have a Beetle map. My CO2 trim read zero, I adjusted it to +2, the difference is marked, the gearbox clatter has all but gone, and when tested it will pull smoothly from 30mph in 6th,(not that I would recommend it). I'm checking to see what the fuel consumption is like, but the plugs look ok, perhaps slightly rich, if it's using much more fuel I'll adjust it back to +1.
Alan.

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