Gas + oil

[west_side_supra]

well i was told in the the last post that i did, that when the knock sensor turns on my timing goes retarded "runs rich" ive never touched any of the filters besides the air filter. i havnt had any money to fix crap. lost my job. im just trying to get trough college to get my automotive degree.

[mrnickleye]

I know the knock sensor, when working normally, will not allow timing advance if it picks up a pre-detonation of fuel, which causes a 'pinging'. I don't believe it will 'retard' the timing lower than the initial setting, factory 10*, others, like myself, 15*.

I believe I read a thread along time ago, here or on SM, that the computer richens the mixture. There was an argument, but I don't think it was ever confirmed.

Perhaps tomorrow I will put my car on the dyno, and smog machine, and pull the wire off the knock sensor and see if the mixture changes (by much).

But certainly driving the car with the timing not advancing as it should will cause bad fuel economy.

[west_side_supra]

ok well me and a friend did some inspecting on the car, 02sensor is fine a little dirty but not enough to mess anything up and we checked the voltmeter and it says its good. EGR filter looks good, theres a little burn mark smaller than a cigerette burn in it but looks new. we pulled off the valve covers, cams sit a little odd, the drivers side cam sits perfectly in slot where the timing gear is, but the passenger one is coming out pretty good amount is this normal? <ill post a picture showing what im talking about.) then last but not least we looked at the spark plugs, cylinders 1-5 look good and barley used cylinder 6 looks brand new why?
today we will check out the injectors and possibly change the oil filter. and if we have the time we will do a compression check.