[Supras] Two knock sensors or one?

[Bob Shapton]

Perhaps refer to service manual at:

http://www.cygnusx1.net/supra/library/TSRM/

> Hi to all,
> 
> We're trying to get my son's 1990 Supra to pass state emissions. It
> has a code 52 for knock and (I am assuming) high HC levels due to
> spark retard.  This is a non-turbo car. There is some debate as to
> whether there is a second knock sensor behind the starter. I can't
> even see a wire going that way, never mind a sensor. I really don't
> want to take the starter off, only to find there is none! Any
> suggestions? Thanks for your help!
> 
> Bill
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> 
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