The idle speed on my c30 t5 running the B5254T7 (105k miles) changes in a rhythmic fashion bouncing between 800-1500rpm without any input. Upon throttle pedal input the rpm rises and stays steady as normal. I cleaned the throttle body with some carb cleaner hoping that it was just dirt blocking the butterfly valve from closing all the way, but it made little difference. Engine accessories still reduce the rpm as they always have, like AC and steering pump, before ecu brings rpm back up and bounces the idle speed around again. Any insights?
C30 T5 Jumpy Idle
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- c30 idleproblems t5 r-design
Das Brot
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The idle speed on my c30 t5 running the B5254T7 (105k miles) changes in a rhythmic fashion bouncing between 800-1500rpm without any input. Upon throttle pedal input the rpm rises and stays steady as normal. I cleaned the throttle body with some carb cleaner hoping that it was just dirt blocking the butterfly valve from closing all the way, but it made little difference. Engine accessories still reduce the rpm as they always have, like AC and steering pump, before ecu brings rpm back up and bounces the idle speed around again. Any insights?
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963 Posts
Yeah this sounds like a FPS, I had a similar experience around 150k miles. Without any misfires or other codes that would be my first attempt to fix it as it is fairly simple and cheap.
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