Hello everyone,
So my car has started doing something wierd when idling from cold:
- Car starts at 1100rpm with no issues like normal
- Revs drop to 850ish after 20 seconds or so
- Engine intermittently emits a hiss like a blow off valve
- Engine sputters and revs nearly die
- Engine management then corrects this and the engine surges to around 1200rpm and then returns to idling normally
This only happens when cold and the car idles with no issues when it is warm (maybe a slight hissing sound?). The car also seems to drive fine, and the mpg doesn't seem to be badly affected?
My thoughts are maybe a boost leak or a vaccuum leak? Potentially a seal might have become damaged that lets air escape when it's cold, but expands and seals the hole when it's warm?
I will try and get a video, but my engine is still warm from driving home
I would really appreciate any thoughts or suggestions. Thanks in advance!
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