Bernie
Newbie
In serious need of help here. I recently bought a 98 sierra with 5.7 vortec at 340xxx km.
On a good tank I'll get 200km on a full tank and no more. Occasionally it throws the odd lean code however me nor anyone else is able to figure out why. Upon hooking up a laptop and checking everything out we realized the long and short term fuel trims are maxed right out on both banks. I tried replacing one sensor out of curiosity and nothing changed, fuel trims still maxed right out. I also replaced the maf sensor and nothing. Injectors all seem to check out, good steady fuel pressure and vaccum is also good. Had a shop replace the entire exhaust system to rule out any leaks causing a lean condition can anyone suggest what else to look for?
On a good tank I'll get 200km on a full tank and no more. Occasionally it throws the odd lean code however me nor anyone else is able to figure out why. Upon hooking up a laptop and checking everything out we realized the long and short term fuel trims are maxed right out on both banks. I tried replacing one sensor out of curiosity and nothing changed, fuel trims still maxed right out. I also replaced the maf sensor and nothing. Injectors all seem to check out, good steady fuel pressure and vaccum is also good. Had a shop replace the entire exhaust system to rule out any leaks causing a lean condition can anyone suggest what else to look for?
