Subject: Re: C4 Technical FAQ and Summary by anesthes on 2008/8/11 13:17:35
Quote:
bogus wrote: I didn't remember it was you, but I remember someone mentioned it.
I have to disagree.
I found in the book, Corvette Fuel Injection and Electronic Engine Management: 1982-2001, by Charles Probst (deceased), on page 10, Overview, paragraph 3.2, reads:
Multiport Fuel Injection (MFI), used in Corvettes from 1985 to 1993, delivers fuel to multiple injectors at the intake ports, ganged as left bank/right bank.
Later on the same page, caption for figure 1-15 reads:
The Corvette Multiport Fuel Injection systems deliver fuel to each individual cylinder. From 1985-93, Corvettes pulsed the eight injectors in two ganged banks of four. Sequential Fuel Injection pulses each cylinder separately.
Also, schematics on page 354 (1992/93 LT1 ECM) show two ECM ports, D11 and D10, each with four injectors. On page 359 (85-91 L98 ECM) show two ECM ports, D15 and D16.
I don't know what else to recommend.
If my source is wrong, I will notify Bentley Publishers for a revision/investigation.
The books say they are wired separately. They are, two pins.
Inside the ECM, On 1986-1989 applications they are bridged together.
Here is a logical diagram of the '165 ECM found in 86-89 L98 cars (Camaro, Firebird, Corvette)
However, if you read the code you'll find that the injector PW is a single integer, rather than a bank to bank pulsewidth. In fact, the $8D code only has two firing modes - single fire, and double fire. NOT bank to bank.
This is also why $8D still has a 100% DC limit at 6,000 RPM of 8 milliseconds.
