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Re: 1991 S10 flashing check engine light no cummunications
Posted to Technical Discussion Forum on 8/17/2015 3 Replies

Ok we did something today we drove it with the AB terminals grounded it started running like crap with the engine running and flashed a code 51 at some point.

Code 51 is an ECM or Prom failure code

given that I have no communication with a number of scan t... Login to read more.

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