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+--- Thread: Egr codes cm 870 after rebuild (/showthread.php?tid=9188)
Egr codes cm 870 after rebuild - Benjamin9669 - 11-02-2023
Egr out of calibration.
Truck runs like a dream after rebuild. At idle it will whistle stop whistle stop whistle stop followed by a check engine light and than it will go off, than going down the road it will boost 36-37psi in 13 or when it boosts a bit it’ll throw a cel. But the only codes is for egr. Main one is egr out of calibration. Maybe rawze would have some input on this?
RE: Egr codes cm 870 after rebuild - Rawze - 11-02-2023
egr valves on CM870's are notorious for sticking. Maybe take it off and clean it, ensure it is operating normally.
Also check the EGR Delta-P sensor and tube that feed it.