[Diy_efi] Chevy / Jaguar conversion spark knock

[Mike Worley]

Bob

I do notice a more pronounced single knock after a start, even when
cold.  Maybe that is the test you mentioned.  After that, it is more
difficult to get it to knock until warm.  Once warm I get the knock
under any sort of load condition or slight acceleration.  No error codes
though.

Mike



-----Original Message-----
From: Robert Rauscher [mailto:rrauscher at nni.com]
Sent: Thursday, May 29, 2003 10:52 AM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock



The base timing for a '91 TBI Camaro is 0 deg BTDC.

The stock code will force knock to occur. This is done
under heavy load in order to test the ESC system. This
test is run after every engine start. Once successfully
run then PE and highway mode SA will be used.

The torque spec for installing the knock sensor is 12 ftlb.

BobR.

On Thu, 29 May 2003 10:06:01 -0400
 "Mike Worley" <Mike.Worley at cae.com> wrote:
> 
> Since I didn't have the Camaro under hood decal that
> specifically sited
> the base timing, I was depending on other feedback I got
> from the Web
> that the base timing should be 0 deg, ( set timing
> connector opened up.)
> I have not attempted using any aftermarket chips or
> reprogramming the
> timing maps, etc. First I just need to get it sorted out
> stock so I know
> where I am starting from.
> 
> Why would your S10 have reduced knock with base timing
> advanced more
> than spec? Doesn't that skew the entire timing map up
> causing more
> knock? That doesn't sound right. 
> 
> Does anyone have the definitive answer as to what the
> base timing should
> be for a 1991 Camaro 305 TBI?  Understandably there
> doesn't seem to be
> much interest in the TBI Camaro.
> 
> Thanks,
> Mike  
> '67 Jaguar 420 (no EFI here!)
> '86 Jaguar XJ6 (Lucas/Bosh EFI)
> '88 XJS convertible (Chevy 305 TBI)
> '02 Yukon XL 
> 
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