[Diy_efi] Chevy / Jaguar conversion spark knock

[Jeff Behrens]

Has the engine always done this or just since the
conversion?  Going back to the basics of bad fuel or
too hot of a plug may be another route to look into. 
Try adding some octane booster and see if it helps.

Jeff
Automation specialist 
Linweld automation
--- Mike Worley <Mike.Worley at cae.com> wrote:
> 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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