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Aug 3, 2018 | 03:33 PM

Thread Starter

Road Warrior

Joined: Nov 2005

Posts: 1,484

Likes: 82

From: Mountain View, California

Read this plug

500 miles on failed rebuild. I'm a little concerned about how shiny the side electrode is. Should I be?

Last edited by Z; Aug 3, 2018 at 03:36 PM.

Aug 3, 2018 | 03:37 PM

cprhed

Stellar HDF Member

Joined: Feb 2015

Posts: 2,961

Likes: 1,178

From: South Dakota

Idon't know. 500 miles? is that correct? I would not expect a plug to look bad after only 500 unless there were major issues with fuel/air or timing

Last edited by cprhed; Aug 3, 2018 at 03:39 PM.

Aug 3, 2018 | 04:04 PM

Thread Starter

Road Warrior

Joined: Nov 2005

Posts: 1,484

Likes: 82

From: Mountain View, California

I wasn't thinking so much that it looked bad, I was just surprised that the face of the side electrode is clean as a whistle. Could be normal for such low miles, I just don't know.

Aug 3, 2018 | 06:31 PM

joe40x

Road Warrior

Joined: Mar 2014

Posts: 1,623

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From: nowhere

Looks very, very lean to me. How did the rebuild fail? Pistons gall?

Aug 3, 2018 | 07:55 PM

xcbullet

Stellar HDF Member

Joined: May 2015

Posts: 2,097

Likes: 307

From: mid Michigan

Those spots of grey are piston coming off on it . It's hard to see in pick but in day light those could be confirmed as shiney aluminum spics on the ground strap in third pic

PS: get rid of the iridium's

Last edited by xcbullet; Aug 3, 2018 at 08:03 PM.

Aug 3, 2018 | 07:59 PM

Kingglide549

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Joined: May 2018

Posts: 4,576

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From: Viet Vet, crossroads

Tea leaves again.
Why guess when you buy an AFR unit and read the ratio?

Aug 6, 2018 | 12:09 AM

Thread Starter

Road Warrior

Joined: Nov 2005

Posts: 1,484

Likes: 82

From: Mountain View, California

Quote:

Originally Posted by xcbullet

Those spots of grey are piston coming off on it . It's hard to see in pick but in day light those could be confirmed as shiney aluminum spics on the ground strap in third pic. PS: get rid of the iridium's

Those plugs were in my engine when the pistons went south so I'm hoping the debris is from that itteration. You're not the first one to diss the iridiums. What's your preference?

Quote:

Originally Posted by joe40x

Looks very, very lean to me. How did the rebuild fail? Pistons gall?

That is exactly right. And thanks for your observation about an apparent lean state. What made you conclude piston gall as previous failure mode?

Quote:

Originally Posted by Kingglide549

Tea leaves again.
Why guess when you buy an AFR unit and read the ratio?

I am with you, and an taking that advice. thanks for it.