SyTyAddict
Member
A while back I was having problems with knock at idle, I had fixed that, but have continued to have problems with knock at WOT. I have a O-meter knock gauge on the dash, so I know when I need to let out of it.
Somehow I seemed to have fixed the (mostly) fixed the issue, but am puzzled as to what contributed to making it better. I had hooked the compressor up to the intake (innertube leak test) and noticed it was dumping air out of the oil filler tube. I sealed up the tb pcv hose and the problem got somewhat better. I removed the tb side pcv valve to realize that it on the was not closing when pressure is applied to the intake. I replaced it with the proper SyTy pcv valve (It had the a cheapo parts store one before) that I had off of a disassembled Ty motor and verified it sealed when pressure is applied and put it back together. It is in the stock configuration with a breather on the driver side valve cover.
The over thing I did was replaced the t-stat, previously the vehicle would get up to temp but not hold operating temp during cruise, it would sometimes drop enough that the tcc would unlock. It was like it would sometimes stick open or was to slow to cycle open and closed; it was extremely inconstant. It had a 180* Robert Shaw, but would only see it touch 180* on a very hot day (temps read off of Tunerpro). I have since replaced it with a 160* Stant Superstat.
I took it out for a spin and it seemed to run somewhat better part throttle, I then rolled into it with very little knock. I logged a full run from 20-100mph and it was running great. Previously it would show lots of knock if I went 60% or more throttle in 1st or 2nd gear, it now runs rather well for such a conservative tune.
Sorry for the long read, I would appreciate input as to what may have been the contributing factor to the knock issue.
Somehow I seemed to have fixed the (mostly) fixed the issue, but am puzzled as to what contributed to making it better. I had hooked the compressor up to the intake (innertube leak test) and noticed it was dumping air out of the oil filler tube. I sealed up the tb pcv hose and the problem got somewhat better. I removed the tb side pcv valve to realize that it on the was not closing when pressure is applied to the intake. I replaced it with the proper SyTy pcv valve (It had the a cheapo parts store one before) that I had off of a disassembled Ty motor and verified it sealed when pressure is applied and put it back together. It is in the stock configuration with a breather on the driver side valve cover.
The over thing I did was replaced the t-stat, previously the vehicle would get up to temp but not hold operating temp during cruise, it would sometimes drop enough that the tcc would unlock. It was like it would sometimes stick open or was to slow to cycle open and closed; it was extremely inconstant. It had a 180* Robert Shaw, but would only see it touch 180* on a very hot day (temps read off of Tunerpro). I have since replaced it with a 160* Stant Superstat.
I took it out for a spin and it seemed to run somewhat better part throttle, I then rolled into it with very little knock. I logged a full run from 20-100mph and it was running great. Previously it would show lots of knock if I went 60% or more throttle in 1st or 2nd gear, it now runs rather well for such a conservative tune.
Sorry for the long read, I would appreciate input as to what may have been the contributing factor to the knock issue.