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1.7 CDTI Surging/Hunting on Idle

49K views 31 replies 14 participants last post by  olsenshane17 
#1 ·
wondering if anyone has/had the same issue.
My 1.7 cdti intermittently surges now & then. not always. the slight fluctuation that is is doesn't really point towards the maf.
Ive changed the SCV, Fuel Filter and ran some good fuel cleaner through it.
no faults are present and never any codes stored.
Still the same. driving me nuts
 
#30 ·
Hi, well how old is it does it have a dpf? it could be when its feeling the dpf that its surging. Next time its doing it look at your instant MPG on your computer it will be on 0.4-0.8 g/h instead of the usual 0.0-0.1 g/h on idle.

Failing that your right sounds like the SCV, but if you've changed that then the Fuel pressure sensor on the fuel rail. Those looked at id have a look at the cam belt timing. The crank could be one notch out.
 
#31 ·
I have the same surging issue. 2015 1.7 turbo diesel. Halfords put an engine cleaner through the car bit never solve the issue. When the surging happens, very intermittent, there's a strong fume smell which makes me think its not burning diesel properly.
 
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