New Chev Firing Order

[Bruce Plecan]

-----Original Message-----
From: WAYNE JOHNSON <flying.monkey at juno.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, October 22, 1998 12:56 PM
Subject: Re: New Chev Firing Order


>Cylinders 4&2 fire 90deg. apart instead of 5&7. My guess is it has to do
>with crankshaft harmonics.
><arcstarter at hotmail.com> writes:
>>It was written:
>>>>      While working on this 99 Chevy truck I found they changed the 
>>firing
>>>>order from 18436572 to 18736542......since it is coil on plug I only 
>>found
>>>>this out by checking the camshaft....does anyone know why the firing 
>>order
>>>>change and is the 98 vette the same???????
>>>>-Carl Summers
>>I heard some story about ignition cross-fire inside the distrib.  
>>Something about the adjacent cylinder (on the distrib tower) being on 
>>the intake stroke accidentally firing instead of the one under 
>>compression. Perhaps the firing order was changed to reduce this 
>>effect?
>>Just a guess.
>>-Bill

7+5 rob each other in intake tract pulsations.  7 stealing from 5,
5 being the one to knock first..
Bruce
>>
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