I read and hear that things like spark plugs and O2 sensors are supposed to be grey or light tan when the mixture is right.

my problem (or question) is when I took my heads off recently the exhaust valves had an unmistakeable RED deposit covering them along with my spark plugs and O2 sensor. the guy at the motor shop said it was a sign of slight detonation but I have also heard that the color can come from gas additives which I use every once in awhile.

anyone ever had experience with red deposits?


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88 WS6 T/A 305 TPI--
K&N,Air foil,hypertech chip, thermostat+fanswitch
free mods, dynomax catback, urethane motor+trans mounts, PST front end poly stuff,
SSM SFCs, Bilsteins
very trick homemade ramair, Accel 300+ ignition system. Ported plenum, intake and heads with 1.94I valves.
Planning: Heddman 1-5/8 longtubes, NOS 150 plate, replace the "peanut"! and Eibach Sportlines.
check it out at:
http://www.geocities.com/transam617

 

When I used to use Sunoco Ultra 94, I got reddish orange deposits on my plugs.

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88 GTA 5.7 TPI Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.

 

HEY !

that is what I had been using for 3 months before I took everything apart.
I hope thats what this is because I dont like the idea of running under detonation all the time. maybe I ll get a scanner and see how much if any detonation I have.

 

I wouldn't think you would have detonation using 94 octane gas.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei distributer
'95 3.23 rearend
hotchkis rear suspension
PST front polygraphite suspension
"speed kills. buy a f@&d, live forever."

 

I like to call it "rust"!

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No guts, no glory.