I’ve been trying to figure out what has changed to cause a popping / backfire to happen above 4k RPM when I take my foot off the gas. It doesn't happen below 4K. I looked on the board for some information and have come across some threads that say the popping sound is normal however this is an increase. I basically haven't had, or noticed, the popping...if it was there in the first place then it has increased dramatically. This is what I have done to try to resolve the issue however it's still making popping / backfire:
I noticed that one of the valve cover washers had deteriorated so I replaced all 4 of them as well as the valve cover gasket. I've noticed that I've got some oil leaking still however I don't believe that this is the cause of my issue. (Please correct me if I'm wrong!)
I then changed the plugs from Bosch +2 to Bosch +2. I didn't know how old they were so I decided to change them. Didn't fix the issue.
I then noticed that the spark plug wires were cracked and replaced them as well. The popping sound still prevails.
So I offer this question up to the board...where do I go from here? Timing off? Valve adjustment? maybe a valve seal is going? leak down test?
It's beginning to get out of my comfort zone, I'll tear almost anything apart and put it back together however messing with the engine is a bit different for me. I'd be able to do a leak down or a compression test however the others just aren't my cup of tea
I noticed that one of the valve cover washers had deteriorated so I replaced all 4 of them as well as the valve cover gasket. I've noticed that I've got some oil leaking still however I don't believe that this is the cause of my issue. (Please correct me if I'm wrong!)
I then changed the plugs from Bosch +2 to Bosch +2. I didn't know how old they were so I decided to change them. Didn't fix the issue.
I then noticed that the spark plug wires were cracked and replaced them as well. The popping sound still prevails.
So I offer this question up to the board...where do I go from here? Timing off? Valve adjustment? maybe a valve seal is going? leak down test?
It's beginning to get out of my comfort zone, I'll tear almost anything apart and put it back together however messing with the engine is a bit different for me. I'd be able to do a leak down or a compression test however the others just aren't my cup of tea