Ping and poor mileage

[JZ67]

My engine seems to ping when it is warm and mileage has always been a bit crappy since I got it. 2001 4.6 SOHC. Engine runs great, no other real issues other than pinging and mileage. I'm thinking EGR valve?

[bbriann]

Kind of sound like a custom tune with too much advanced timing.
Previous owner may have tweaked the computer tune and may not have told you.

[Stephen06GT]

What octane fuel are you using and does the ping go away with higher octane?

[JZ67]

Kind of sound like a custom tune with too much advanced timing.
Previous owner may have tweaked the computer tune and may not have told you.

From what I know, it's a stock tune.

[JZ67]

What octane fuel are you using and does the ping go away with higher octane?

I use 87 but have run them all with no differences.

[ZR]

I'd look to.......
-possible plugged cat
-clean MAF and retest
-low fuel pressure / lean (filter been done recently??)
-how long since plugs changed?

[1BAD92LX]

Maybe it’s got some carbon build up in the combustion chambers. Fire a can a sea foam through it.
Slack/loose timing chain? Working at Honda I see that a lot.

[Laffs]

ZR has you on a good path. I'd also check for vacuum leaks and see if you can have your injectors checked. I've had a couple 2V buddies have their stock injectors get sticky after 150k.

[ZR]

No downside to running a full can of SeaFoam through your next tank of fuel.

[JZ67]

I'd look to.......
-possible plugged cat
-clean MAF and retest
-low fuel pressure / lean (filter been done recently??)
-how long since plugs changed?

Cleaned the MAF. I have only put on about 3k since I have owned the vehicle. To the best of my knowledge, the plugs were new when I bought the car. Not sure about the fuel filter. I haven't driven it since cleaning the MAF a couple of days ago.