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Re: Code 77
Posted to Technical Discussion Forum on 8/12/1998 3 Replies

Ok, here is an EGR diagnostic from a 93 M van with a vacuum modulated valve (backpressure)

DTC 32 (vacuum modulated)
The PCM will check EGR operation when:

[...trimmed text...]

The ECM monitors EG... Login to read more.

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