Rpm Surging

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Wheelspk

Member
Joined
Mar 24, 2024
Messages
31
Location
Pakistan
Car
C3
Hello everyone!

My RPMs keep Fluctuating/ Surging what could be causing this ?
When in park the rpm goes up and down and i can hear the cars sound changing as the rpms move up and down.

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Also there is a annoying whining sound when i cold start the car which tones down when the car is warmer but is still there, me thinking its bad PS oil i changed it to new oil , bleed the system but the whinning sound is still there.

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For the idle, spark plugs (check correct gaps or replace and check) and coil packs.

I would start with the plugs and go from there.
 
For the idle, spark plugs (check correct gaps or replace and check) and coil packs.

I would start with the plugs and go from there.
Have changed the plugs , coils and gaped to .040
The idle surge remains.
 
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I had similar, traced it to the MOT evap valve jamming open.
 
+1. That was the first thing I thought of when the OP mentioned surging RPM.

Intake hoses gets hard and brittle with years, they won't hold tight, could result in surging RPM
 
Found the issue, it was the throttle body plate, it had a nasty hole in it…had to open the whole intake conform and found it…replaced it a used one and that fix the Rpm surge.
 
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An air leak is the most common thing.
 

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