[Diy_efi] Chevy / Jaguar conversion spark knock

[Mike Worley]

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 



-----Original Message-----
From: Scott Pearson [mailto:mrcad472 at iowatelecom.net]
Sent: Thursday, May 29, 2003 9:34 AM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock


When you're changing the base timing, are you also changing it in the
EPROM?
I had a 305 powered S10 in the other day that had the base timing set at
"0", set it to the 6 deg advance that was specified and the knock went
away.

- Scott
----- Original Message -----
From: "Mike Worley" <Mike.Worley at cae.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 28, 2003 12:27 PM
Subject: [Diy_efi] Chevy / Jaguar conversion spark knock


> I have been struggling with a resolving a spark knock in my now Chevy
> powered Jaguar convertible.  The engine and computer / harness is from
a
> 1991 Camaro.  Its a 305 TBI.  Even running at -4deg retard base timing
I
> still have spark knock upon even light acceleration (when warm).  The
> sensor doesn't seem to catch it.  There are no error codes showing up
> and I do seem to have some RPM drop when doing the bang on the block
> test.  I wanted to remove the sensor but due to the close quarters I
> cannot seem to break it free.  Its stamped steel construction doesn't
> lend its self to much muscle and every thing seems to slip.  I have do
a
> spare and was wondering if there is alternate spot to mount it on the
> Chevy block or intake???  I guess what's more important would be why
is
> knocking in the first place...  The engine runs strong, is tight, good
> compression and only 45K miles.   Does anyone have the correct part
> numbers for the sensor and associated signal conditioning amp for the
> 350 TBI engine.  I want to make sure the right parts are installed.
>
> Mike
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