detonation
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detonation - 5/21/2007 4:00:04 PM
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spiral72
Posts: 53
Joined: 9/28/2006
Status: offline
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I have a 95 Intrepid 3.3L with 215,000 miles. The car is still in excellent condition due to religious maintenance on it, but it's getting old.
I've had the same problem on a couple high mileage vehicles and am trying to work this out..... and would like some ideas.
The engine has started detonationg under a heavy load (up hill) in O.D. and even in 3rd gear on a very steep hill. I run and have always run 87 octane BP/Ameco gas. The temp is about 1/3rd (if accurate), the ignition system is about 10,000 miles old and it started this before the new parts.
The plugs look good with a normal color and I still get about 32mpg. Higher octane gas doesn't seem to help much, neither does the temperature outside summer/winter. Any ideas?
I figure (maybe) that due to carbon buildup on the top of the piston, it increases the compression ratio over time. No?
I could:
run higher octane gas (which I am going to try 93 octane on my next fill-up)
try a colder spark plug
run a cooler thermostat
redard the timing, isn't it computer controlled?
Live with it until my engine grenades.
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