2000 4.7, What kind of Spark Advance Should I see on the Road?

So I recently replace my #1 Knock Sensor. My understanding is that when the engine throws a code on this, it will retard timing significantly, and really lower mileage. And I must say that since I bought this a month ago, in this condition, we have really had some sade fuel bills.

Anyway I just replaced the sensor at last, and connected the BluDriver and tablet to view Live Data on the road. On the freeway in the 65 to 70 mile per hour range we are seeing around 27.5 to 28 degrees of advance.

I can find nothing after hours of searching on line as what to expect.

We did check our freeway mileage after 50 miles and it looks like we are getting about 15.5 mpg out there.

Can anyone share what they see on your 1st Gen 4.7's.

My Alldata only shows what timing we should see at idle.

Thanks Guys!

 

Can't answer your timing question but the 15.5 mpg is right around what I see on my 2000 AC 4x4 4.7l. I believe this is typical of the 1st Gen 4.7s.

 

Your timing is set by the computer using rpm, load, knock sensor input, so the exact number is different for different cars. That 28 degrees sounds about right to me though. I’m going by when I played around with advance curves on old muscle cars back in the 70’s.