Engine Performance problem
1999 GMC Suburban V8 Four Wheel Drive Automatic 143000 miles
1999 GMC Suburban 7.4 454 that every few months will no start. Wait about 10 minutes it fires right up. Also, the passlock light is blinking on the dash. When the truck is warm after coming out of a store the engine fires but seems like not a good spark. Have had a few issues where you can smell strong gas out of the tailpipe. Engine seems to lack power when it is warm but I cannot confirm that it is just a feeling.
I have read several ideas to fix this but not one concrete answer. Some say passlock module others say the brain behind the instrument cluster.
The fuel pump has been replaced twice and the fuel pressure regulator once. Has new plugs and wires. Code reader comes up with no codes.
Has anyone been able to track this issue down to something?
Sunday, March 28th, 2010 AT 2:37 PM