Q: 97 buick lesabre timing question?

while checking data on a scanner i noticed that my timing was at -17° at idle, when it should be over 20° and also when going down the highway it never goes over -5°. when getting on the gas it will actually go down to -30°. i also checked another vehicle to make sure it wasn't my scanner and the other vehicle showed 25° idle. so what could be going on here? any thoughts? but also the car runs well the only reason i used the scanner was i think i should be getting better fuel mileage, i am only getting about 20 mpg.

A: 97 buick lesabre timing question?

i am not getting a "check engine light" either.

Q: 97 buick lesabre timing question?

while checking data on a scanner i noticed that my timing was at -17° at idle, when it should be over 20° and also when going down the highway it never goes over -5°. when getting on the gas it will actually go down to -30°. i also checked another vehicle to make sure it wasn't my scanner and the other vehicle showed 25° idle. so what could be going on here? any thoughts?

A: code p1870?

sorry, it is a '97 buick lesabre limited