The Cavalier made me do it.
My plans were to keep my Bi-Fuel Cavalier for many years. I have spent countless hours in excessive maintenance and upkeep to ensure that it would last, however a measly part may doom my Cavalier. It is the AF-ECM (Alternative Fuels Engine Control Module). The AF-ECM is not one of GM's better designs. It has some problems and the first is it's case. It is made of aluminum and aluminum corrodes. The second problem is it's location. It is located behind the drivers side front fender skin. This makes it susceptible to weather. So when you mix the two together the seal on the AF-ECM begins to corrode. Once the corrosion begins, in time, it will force the lid apart until moisture enters and damages the unit. The current bluebook price of my Cavalier is about $2100.00 and a new AF-ECM from GM (52369822), plus reflashing the microcode, diagnostic time and tax is about $2035.00. So salvage or Ebay is the only way to go. The worst part of this story is that when people salvage bi-fuel Cavaliers for parts, they have no idea the AF-ECM is behind the left fender skin. So the part never gets salvaged and rarely makes it to EBAY. In all the years I have been scouring EBAY for Cavalier parts, I have never seen an AF-ECM. Over six years, I have replaced two AF-ECM's in my current Cavalier. Both came from local junk yard salvages. When the current AF-ECM goes, so will my relationship with Cavaliers. At that point there will be a bunch of lucky EBAY'ers who will be bidding on a ton of Cavalier CNG parts that I have collected over the years. So you are wondering what this has to do with a Silverado conversion. Well when the Cavalier goes, I am going to need a new vehicle and the Silverado is going to be it. In conclusion "The Cavalier Made Me Do It"