08/22/2026
2007 f150 4.2 customer thought they had a bad motor mount after hearing a loud bang while driving around 30-40 mph
What he was actually hearing was a backfire thru the intake on acceleration during certain rpmβs we were able to duplicate as well as catch it on a graphβ¦
After replacing spark plugs, plug wires and ignition coil this truck is as good as new, no backfire not miss runs super smooth also fixed there ac while it was in