99Classic
Newbie
No. The computer does not change the timing based on the cam sensor. The base ignition timing comes from the CRANK sensor. The distributor/cam sensor needs to be aligned with the crank sensor so that the rotor phasing is close--otherwise the spark could jump to the wrong distributor cap terminal. The computer uses the cam sensor to determine which cylinder is misfiring, and nothing else.
So, no, being way off on the "Cam Retard" or "Cam Offset" or whatever the scan tool calls it is NOT compensated-for elsewhere. It needs to be within tolerance (+ - 2 degrees.)
Got me beat. Only -20F overnight here, but with high relative humidity and 12 mph wind, the candyass wind-chill is considerably "colder"
I can't even picture that.
Yeah I'm up in Canada and with the wind chill she hit -58⁰ farenheit last night. Not too fun lol.
When I adjusted the timing we got it on the proper tooth but the closest we could get it was +6⁰ of cam retard after turning the distributor all the way clockwise. Maybe need another tooth clockwise then turn it back counterclockwise? Or would this be just gear wear? Bad sensor? Seems to run really good aside from having the original 230k mile plug wires.
On the lifter side of things, haven't had much time with school, work, etc. The sound isn't a knock per se. More of a hard hollow tapping noise. Only does it if its been sitting 4+ hours. So if the engine completely cools before that it doesn't do it. So not exactly temperature based.
Also the lifter plungers didnt push down when I was adjusting the rockers. 1/2 turn after pushrod lash was 0 gave me no compression, but 1/4 turn did. These new lifters seem to have decent travel in the plunger so I'd bet the old ones are still plugged up. I'd bet this entire issue is with the lifters.
Also lastly, the truck seems really sluggish lately. I know shes got quite a few miles but she just seems lower on power than she should be. Maybe the lifters are causing it. Same with the crap mileage at 9mpg combined.
Thanks for the info on the sensors and stuff, I just figured the timing was advanced automatically. Not getting any codes though for it being +6⁰.