redfishsc
Tired of fixing lousy engineering.
So I've owned 2 1990 half tons (4.3 and 5.7) and a 93 S10.
The S10 was only 4 years old when I got it with 25k miles. The 1990 4.3 was 8 years old with about 90k, and the 1990 5.7 was a solid 25 years old well over 200k.
They all had valve rattle when accelerating "lightly to moderately". No rattle noticeable at WOT or cruising.
Rattle disappeared if I ran 92 octane.
I assume this was spark knock/detonation.
Should I have been running colder spark plugs? I can't remember what plugs I was using, that was too many years ago. I was using whatever Pep Boys sold me.
I've owned 2 Vortec 5.7s and I drive a 2004 half ton with the 4.3 for work, never once hear valve rattle, I suppose because of the knock sensor doing it's thing.
The S10 was only 4 years old when I got it with 25k miles. The 1990 4.3 was 8 years old with about 90k, and the 1990 5.7 was a solid 25 years old well over 200k.
They all had valve rattle when accelerating "lightly to moderately". No rattle noticeable at WOT or cruising.
Rattle disappeared if I ran 92 octane.
I assume this was spark knock/detonation.
Should I have been running colder spark plugs? I can't remember what plugs I was using, that was too many years ago. I was using whatever Pep Boys sold me.
I've owned 2 Vortec 5.7s and I drive a 2004 half ton with the 4.3 for work, never once hear valve rattle, I suppose because of the knock sensor doing it's thing.