[AlexT]

Hi everyone,
Does anyone know if it's normal for Z20LET throttle bodies to shudder slightly when throttle is completely open? Also seems to make a static/electric noise. The pedal feels slightly lazy/delayed when engine is running.
We've tested the throttle body sensor wires, throttle pedal wires and pretty much every other engine related wire, and can't find anything wrong. Also changed the throttle body for another one, which made no change. Any ideas? I'm quite new to this so not sure if I'm worrying over nothing. Thanks in advance

Videos:

Astra GSI juddery throttle body | Z20LET

Anyone have a clue if this is normal? Tested wires for throttle body and throttle pedal with no issues found. Throttle body seems to screech and judder, and...

youtube.com

Astra GSI juddery / noisy throttle body | Z20LET

Anyone have a clue if this is normal? Tested wires for throttle body and throttle pedal with no issues found. Throttle body seems to screech and judder, and...

youtube.com

 

[ayresyy]

The noise is fairly normal, doesn't appear to be huge amount to worry about there. Is it effecting the way the car drives?