Welcome, Guest. Please login or register.
July 21, 2018, 10:59:44 pm

Login with username, password and session length
Director PLEASE!!!!
Add your location information to your personal profile. Thanx!
435248 Posts in 37264 Topics by 9537 Members
Latest Member: Mgabski
Search: Advanced search
Advertiser Inquiries
+ My Community
|-+ Library Tech Library Tech
| |-+ Tech Articles/Sticky's Section
| | |-+ Ford EFI Diagrams and Specs
| | | |-+ Injector Firing Order
0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: Injector Firing Order  (Read 1072 times)
Joel5.0
El Hombre
Administrator
Big Block
*****
Offline Offline

Posts: 22510


Location: Puerto Rico
Miracles?.... by appointment only!


« on: May 20, 2015, 09:26:44 am »

Firing order does not effect spark at the plugs because that is still determined by what order you put the plug wires on the distributor cap. But if you have a sequential fire fuel injection computer, then the computer program opens the injectors in the same order as the camshaft timing. This can cause issues when running a “High-Output” computer with an older camshaft. If you leave the injectors in the HO order you might notice a slight effect on idle quality. There are no effects once the engine speed picks up because the injectors open so fast.

There are 2 ways to "correctly" fix a computers mismatched firing order:

1. The best option is to change to a HO camshaft to match the computer.
2. Or you can reprogram the computer to match the cam firing order.

Other people with mismatched computers swap the injector pins at the computer plug. This causes more problems than it's worth because of the computers Adaptive Fuel Strategy.


An example of how the computer deals with mixed up injectors:

1. The R O2 sensor sends a rich signal to the computer.
2. The computer will then shorten the pulse width to Right side of the engine. But
    two of those injectors have been MOVED to the Left side of the engine!
3. Because 2 of the injectors that have been directed to minimize the injector pulse are
    now on the other side of the engine, this causes the left side of the engine to run lean.
4. So now the L O2 will send the lean signal to the computer.
5. The computer will then lengthen the pulse width to Left side of the engine. But
    two of those injectors  have been MOVED to the Right side of the engine!
6. So now the R O2 sends another rich signal to the computer.
7. Cycle repeats, each time getting worse.

You end up with 1, 2, 5 & 7 running 25% rich, and 3, 4, 6 & 8 running 25% lean!
Therefore it is strongly discouraged to mix around the fuel injectors.



Logged

ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
Pages: [1] Go Up Print 
« previous next »
Jump to:  



Powered by MySQL Powered by PHP Valid XHTML 1.0! Valid CSS!
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines



408 Stroker