I agree: this bilateral asymmetry seems to either point at two clogged
injectors on one side, or something leaky with air on one side.

A few months ago I found a leak on the rich side and tightened that
down. No leak found on the lean side. So, near as I can tell, neither
side presently has a leak.

What's a really good way to be sure?

The O2 sensor receives exhaust from both sides and the ECU will adjust
the mixture for an average reading. If one side is running rich (like my
left side) then the ECU will compensate by leaning out the overall
mixture, causing the right side to be too lean. This, according to my
theory. The plugs on the what-should-therefore-be-lean side look like
plugs should look. On the rich side they look a bit black and sooty.

--

Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR

On 9/12/2007 2:43 PM Chris S. wrote:

> Intake leak on the "normal" side causing a leaner condition?
>
> */"Mike \"Rocket J Squirrel\" Elliott" <camping.elliott@GMAIL.COM>/* wrote:
>
>     The testing continues.
>
>     # 1 (right front) compression > 120, plug looks normal.
>     # 2 (right rear) compression > 120, plug also looks normal.
>     # 3 (left front) compression > 120, plug indicates mixture is rich.
>     # 4 (left rear) compression > 120, plug also indicates richness.
>
>     right left mixture asymmetry?
>
>     --
>
>     Mike "Rocket J Squirrel" Elliott
>     71 Type 2: the Wonderbus
>     84 Westfalia: Mellow Yellow ("The Electrical Banana")
>     74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
>     KG6RCR
>
>
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