90q 20v Running Rich

Bernard Littau bernardl at acumenassociates.com
Mon Jun 16 14:27:32 EDT 2003

Hi David,

> I have been noticing my 20v is running quite rich and the power is going
> down the tubes... Well in hopes to fix the problem I was browsing through
> the engine compartment looking for the mixture adjustment screw and I
> cannot
> find it. Could someone please point me in the right direction!

First, make sure everything else is OK.

I would start with the temperature sensors and make sure they are all
functioning correctly.

On the 10V 4kq, I would suspect a faulty engine temperature sensor, one that
is reading cold.  The temperature sensor tells the ECU to run rich (Think
Choke) while the engine is cold.

I'm pretty sure the 20V will have a similar system.


Bernard Littau
Woodinville, WA
'86 4kq

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