CarTalk.com Best of Deals Car Reviews Repair Shops Cars A-Z Radio Show

Engine pings

engine pings under load and backfire when deccell

Ping can result from: fuel octane too low, engine lean from vacuum leaks, egr or pcv vslve stuck open, erroneous sensors, etc, or, knock sensor inoperative.

Make model and year of car would help.

Adjust your carb and set your timing better