 SparK plug reading help needed, Using dual weber idf's |
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| tornik550 |
 Aug 5 2012, 12:46 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
Are these statements regarding spark plug reading correct?
1. To check to see if my main jet mixture is correct- drive around at high rpm for awhile then quickly shut off the engine. Then look at the porcelain furthest from the electrode. If white- too lean, if black too rich. 2. To check idle circuit mixture, idle the engine for about ten minutes, shut down the engine. Look at the porcelain closest to the electrode. If white-lean, if black- rich... FYI- I do have an air fuel gauge hooked up. I just want to verify my readings. |
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| ConeDodger |
Aug 5 2012, 02:16 PM
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#2
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Apex killer! Group: Members Posts: 23,588 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California 
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My understanding is that the advent of unleaded fuel made spark plug reading archaic...
You can trust your A:F gauge... Have some faith (IMG:style_emoticons/default/biggrin.gif) |
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| VaccaRabite |
Aug 6 2012, 05:54 AM
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#3
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En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Unless you shut off the engine and coast the car to the side for the road, reading plugs these days only tells you what its doing at idle, not when the engine is under load and you really care about it.
Zach |
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| brant |
Aug 6 2012, 06:54 AM
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#4
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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I don't believe its possible to accurately read spark plugs with modern gas
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| sean_v8_914 |
Aug 6 2012, 07:33 AM
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#5
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
it works. its still a viable way to get you in the ball park but...
"in the ball park" does not really win the game a wide band O2 is a home run chalky white will run hot. sooty black could wash down cylinders and ruin oil |
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