theoscholz1
C70 diesel engine running lean
Summary of the thread
A 2013 Volvo C70 diesel with low mileage is experiencing weak engine performance, a check engine light, and rough, jerky acceleration, suggesting a lean running condition. Possible causes include a faulty mass air flow sensor, intake manifold leaks, EGR valve issues, oxygen sensor problems, or a defective catalytic converter. The issue was ultimately traced to a defective injection valve/injector, which was repaired, resolving the problem.
Did this summary help you solve your problem?
4 comment(s)
theoscholz1 (community.author)
Thanks for the tip! I haven't checked those specifically, but I did give the engine bay a quick look-over and didn't see anything obvious. Was your Saab's check engine light also on? And did it feel like a definite 'jerk' when you tried to accelerate?
lindaphoenix1
Yep, check engine light was definitely on, and the acceleration was jerky, almost like it was struggling for fuel. Given your Volvo is a diesel, it could also be related to the EGR valve, oxygen sensor, or even the catalytic converter. But honestly, with those symptoms, and the low mileage, it's probably best to get it checked by a professional. Could save you a lot of headache.
theoscholz1 (community.author)
Thanks a lot for your help! I took it to the shop, and you were right – it turns out an injection valve/injector was defective and causing the lean running condition. Cost me 515€ to get it fixed, but at least it's running smoothly again!
rmh_community_comment_box_header
community_crosslink_scanner_headline
community_crosslink_scanner_intro
community_crosslink_scanner_title
community_crosslink_scanner_price
community_crosslink_rmh_headline
community_crosslink_rmh_intro
community_crosslink_rmh_title
community_crosslink_rmh_subtitle
community_crosslink_rmh_brand
VOLVO
community_crosslink_rmh_model
C70
lindaphoenix1
Sounds frustrating! I had a similar issue with my old Saab 9-3. Reduced power and rough running. It turned out to be a faulty mass air flow sensor causing the engine to run lean. Have you checked that or the intake manifold for any leaks?