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Full Version: Egr codes cm 870 after rebuild
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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?
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.
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