My mom has a 1991 Chevy Lumina Apv Van. It's running okay right now but it is knocking. When she cranks the car to start it, it doesn't make that noise but when she starts putting on foot on the gas pedal to go that is when the knocking starts. She has a V-6 engine in it.
I'am no mechanic but it sounds like it may be coming from the engine. It cranks right up with no problem, the only time the knocking noise comes into play is when she gives it gas to go.
I'm hoping that somebody can help her diagnose this problem so she can get it fix asap. I have 2 handicapped brothers that have to ride in the van. If you'll need any more info just ask me. Thank you for your time and god bless you'll.