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Old 06-08-2021, 08:38 AM   #1
89'HBV6
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Join Date: Mar 2020
Location: Washington State / the Left Coast
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Vehicle: 89' D21 KC SE V6 5spd 2WD - 87' D21 KC SE V6 5spd 2WD
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Default How to: Read your spark plugs...

First posted elsewhere. Thought it needed it's own thread.

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A plug will tell you much about how each cylinder is running. Spring for a new set of GOOD (NGK) plugs (CHEAP!) and run them for 2-7 days. Pull each, lay them out side by side and see/document (in PIC) what they look like on the tips. This will tell you much...

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EDIT: Here's an example shot from an inline 4 I have...

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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

Last edited by 89'HBV6; 06-08-2021 at 08:53 AM.
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