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Funkyflynz

Vano noise? Flat spot and changing idle

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Hey team,  have a weird issue.

when idling... When idling the rpm will jump from 1200 (cold) down to 500, the car sounds like its labouring for a while (10-30sec) then jump back up to 1200.  When hot it will drop down to 400.  

When driving...whilst driving the car hits flat spots randomly, it doesnt cough or splutter rather it just becomes unresponsive like there nothing there.  Engine tone changes.  
 

Poking around i seem to have some noise coming from the vanos, not sure if this is normal or signs of an issue?  Related or not?

 

Any thoughts/advice would be appreciated. 

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Hi Lee

No it doesn't sound good, have you tried the long screw drive to your ear. This will help pin point the area of the noise.

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52 minutes ago, sweetm3 said:

Hi Lee

No it doesn't sound good, have you tried the long screw drive to your ear. This will help pin point the area of the noise.

Thanks, yes, it sounds like its from the vanos.  Might be the typical vanos rattle but ive not heard it before.  Have a vanos rebuild planned and part ls on the way.  But a rattle should t be causing these flat spots. 

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Remove and test the throttle position sensor, cleaning mine fixed my erratic idle. As for the flat spots, check for any ECU codes, especially hidden (secondary) codes, you'll need to use INPA or DIS for that, not a consumer code reader.

 

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2 hours ago, M3AN said:

Remove and test the throttle position sensor, cleaning mine fixed my erratic idle. As for the flat spots, check for any ECU codes, especially hidden (secondary) codes, you'll need to use INPA or DIS for that, not a consumer code reader.

 

Thanks, will give that a try.   I need to get on to INPA . Been putting it off as i prefer spanners 😂😂

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Did you have any luck with figuring this out ?  I am having similar issues with funny idle and some ECU codes.

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5 hours ago, Chanderpaul said:

Did you have any luck with figuring this out ?  I am having similar issues with funny idle and some ECU codes.

Ive ordered a new tps and a vanos rebuild kit.  Will update once ive tried done each

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