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Sierra 1500, fixed stalling then a code 54


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fatshady
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Aug 7, 2007, 8:26 PM

Post #1 of 1 (1811 views)
Sierra 1500, fixed stalling then a code 54 Sign In

My old 1500 has acted up intermittantly over the last year, stalling randomly, usually when coasting or stopping (see old thread on "stalling and stumbling.") On sage advice I recently changed the ignition control module at the distributor and it has stopped the stalling. I had also changed the fuel pump, strainer, filter, plugs, and fuel pressure relay before replacing the ICM. The truck ran great for about 2 days before beginning to run rough (but not stall) and yielding a code for the first time ever. The OBD-1 chart says 54 means "fuel pump relay low voltage." I am not sure if this means into or out of the relay. I cleaned up all the contacts anywhere close to the relay and wiring, but am not sure what to look at next. It seems to be getting progressively a little worse, though the symptoms don't seem to start for a minute or so after a cold start up. While the ICM did fix the stalling I had finally discovered that I had spark during the outages, but no fuel at the TBI's. One or more components (ICM only?) was evidently balking and causing the fuel flow to stop. I can't help but think that I have only partially fixed the original problem. Anything stand out to you guys, other than that I don't know what I'm doing over here?






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