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Old 09-30-2003, 05:56 PM   #1
eljefino
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Default plugs-- hotter or colder for oil burning

My 96 SL std trans burns oil presumably through the valve seals. I say this because there's the occasional belch when I get on it after coasting. The car also bogs and knocks sometimes when it gets good and warm.

I think the oil is making it go into knock retard mode, and the dang car remembers this event for a long time. Unplugging the battery resets the fuel map and the car goes great for a while.

Anyway I want it to knock less without spending much $$$. My idea is split between--

going with a colder plug to cool down the combustion chamber, reduce knocking.

Going warmer, which self cleans better and gets the oil out of there faster.

Running stock NGK copper plugs and chevron supreme 5w30. Gets driven plenty hard on the highway enough of the time.

Burns 1 qt in 750 miles.
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Old 09-30-2003, 07:02 PM   #2
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Are you sure you're not having ects issues or maybe O2 sensor probs? If not have you tried the MMO soak to remedy the oil consumption? Maybe you could try 10w40 for a while til it get's too cold up there. I think changing your plugs will not get you the desired results under all driving conditions.
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Old 10-01-2003, 12:49 AM   #3
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The plug heat range really affects only the temperature of the spark plug, not the combustion chamber. If you had problems with the plugs being fouled by oil, a hotter heat range might help, but it doesn't sound like that's what's going on..
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Old 10-01-2003, 05:16 AM   #4
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ECTS, O2 are new as well as plugs, wires, filters, etc. I'd love to reverse engineer the knock retard programming since if it knocks once it's a pooch for a long time.

It gets chilly willy here in Maine but I might run Rotella synth 5w40 if this situation doesn't improve.

Some dodge truck guys run a different plug to reduce pinging in old school 318/360 motors with nonadjustable timing, where I got my idea.
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Old 10-01-2003, 10:18 AM   #5
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EL
And the mileage on the car is ????
...
> 95 SL 2 = 653,369 Miles 40.4 MPG, as of 5/20/11. My manual Radiator Fan Switch, courtesy of Wolfman's patient installation guidance, continues to be.......invaluable < The car was retired
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Old 10-01-2003, 11:16 AM   #6
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Something you might find interesting (but probably won't help as yours is a 96).

My 2000 had a similar sudden lack of power if I stomped on the gas hard once the engine temperature rose a little over the normal position (sitting in a traffic jam, A/C off, and then hitting the gas moderately hard would do it every time).

The problem, as yours sounds like, is the computer detects the knock and retards the timing too much and leaves it there. Mine would take over 200 kms to get back to full power.

Anyway, Saturn had upgraded ECM software available that fixed the problem 100%. Now the spark advance aggressively advances again - withing minutes (or less).

The new software doesn't turn off the A/C clutch at WOT anymore - so that's a bit of a minor negative (I have to remember to press the A/C button when I want max power...).
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Old 10-01-2003, 11:25 AM   #7
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This is a perfect example of the expression “Being on the horns of a dilemma.” To burn off contaminants, you need a hotter plug. To avoid having the plug become a potential detonation source you need a colder plug.

The real problem, though, is that oil entering the combustion chamber is the greatest source of uncontrolled combustion at all RPMs. Poor fuel has its greatest impact at lower engine speeds but oil in the chamber covers the spectrum.

The only real solution is as you are aware…getting a handle on the oil control problem. Trying to solve this through the plugs is not going to be much of a solution.
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Old 10-01-2003, 11:31 AM   #8
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Quote:
Originally posted by eljefino

Some dodge truck guys run a different plug to reduce pinging in old school 318/360 motors with nonadjustable timing, where I got my idea.
This is true. I am running one range cooler in my 3.9 V6 (which is just a 318 with two less cylinders.) It reduces pinging, but my 3.9 engine doesn't consume any oil at 150,000 miles, your situation is different.
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Old 10-01-2003, 04:23 PM   #9
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Car has 115k mi, have had it since 93k. Been maintained well in my ownership, dunno before.
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