MiniTransAm

iTrader: (3)

Hey guys.

Noticed the other day that I had a hesitation when the motor was cold around 2000 rpms or so. I had recently replaced the plugs with NGK TR55 copper plugs. I believe I also got colder than stock plugs as was recommended in a thread on here. Hell if I can find the thread now though. The gap on all of them was around .038

When I pulled the passenger side plugs, they looked fine. Looked like a normal used plug. However the driver side, they ALL had yellow on the electrode(?) of the plug. What could cause this discoloroation? Is is at all possible I've got a goofy 02 sensor for that side which could have the car running rich/lean?

Here's the pics. Left plug was from the passenger side and is what all 4 looked like. Right side is from driver side and all 4 looked this way.

LS6427

iTrader: (2)

02 sensor probably isn't operating properly. You won;t necessarily get a code until it fails.

Replace it with a Denso.


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99RTA

iTrader: (-1)

What color is the coolant in your car? Its possible a little is getting in that cylinder.

MiniTransAm

iTrader: (3)

I believe it's dexcool. All 4 cylinders on that side of the engine looked that way. Gonna replace the O2 sensors tomorrow and see what happens.

LS6427

iTrader: (2)

Its not coolant getting in. If it were getting into all 4 on that side you'd have major overheating issues too, with coolant boiling over.

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MiniTransAm

iTrader: (3)

I hope I don't get screwed but I'm going to put Bosch plugs in tomorrow. My father in law works at carquest and he can get me stuff for crazy cheap. Hopefully I get lucky with them. If not, I'll try to find some denso's or order some Delco's off GM parts direct.

LS6427

iTrader: (2)

Don;t waste your time with Bosch. Also, AC Delco 02 sensors are now Densos.

I believe Densos are like $39.00 here: www.rockauto.com

Part # 2344087 and #2344025


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MiniTransAm

iTrader: (3)

Denso's website says you can buy them at Carquest so I'll check into it when I go up there. Were going to the beach and taking that car on Saturday so unfortunately I can't wait for any to be shipped to me. Cross your fingers for me.