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Originally Posted by Ranger My money is on the wires. I, as well as many others have had a misfire develope right after the fuel rail replacement. Replace the rest of the wires with OEM wires. Also check for a leaky FPR. |
Agreed with Ranger. Many people posted about misfires after the fuel rail recall service was done, and wires has been the number 1 suggestion. As far as I know, no one has come back to complain that it didn't work. I also have a 96 SLS, and had misfires before the fuel rail was replaced. At about 85k miles, it started with an occasional miss, then it got worse and worse. The wires fixed it right up. Now I'm at 95,5xx and still running great. I would start with the wires, especially if it's got more than about 70k on the clock.
The fuel pressure regulator is easy to check. It's the only thing on the fuel rail with a vacuum line attached to it. Start the engine and pull the vacuum line off the FPR. If fuel leaks from the nipple, the FPR is bad and needs to be replaced. That will definitely cause a rich condition and hard hot restarts. Other than that, they might not have seated an injector or an O ring properly, or maybe an injector is leaking.
Start with the wires. You will need AC Delco wire set 748J, and you can find good prices at
www.rockauto.com or
www.gmpartsdirect.com. The plugs should be AC Delco 41-950. If you have Bosch plugs in there, replace them with the good stuff because the Bosch's are junk.
