PGM-FI System is SEQUENTIAL

[dano28]

This came up during the stupid thread about running your car with with one spark plug wire removed.

It seems that there is an impression out there that says that ALL four injectors fire at the same time. This would be an exceedingly stupid way to waste fuel. Frankly, I have never heard of such a thing on any car.

I could probably search and find a better reference but for now, this should do.

In the free online service manual for the 94 Accords ( the best one for the F22A's) Section 11 page 20 it states:

"The PGM-FI system on this model is a sequential multiport fuel injection system"

Now...if you believe differently, post YOUR reference.

[RICHIE*GT35R]

I don't know on Honda. But in BMW from 1984 to 1986 ALL four injectors fire at the same time. Then in 1987 they change it to sequential. This is on the six cylinders engine

[dano28]

I don't know on Honda. But in BMW from 1984 to 1986 ALL four injectors fire at the same time. Then in 1987 they change it to sequential. This is on the six cylinders engine

So let me get this straight.... on the BMW 84-86 six cylinder engines ALL four injectors fire at the same time. Hahahaha

I doubt that very much.

Damn, even the Civic punks that hang out at my local Dairy Queen know better than this.

In the Chilton's manual for 1984-1995 Accord and Prelude, section 4 page 21 it states " The CYL sensor is used to detect rhe position of No. 1 cylinder, the signal is used to trigger the sequential fuel injection"

Come on lets see YOUR reference material..

[RICHIE*GT35R]

So let me get this straight.... on the BMW 84-86 six cylinder engines ALL four injectors fire at the same time. Hahahaha

I doubt that very much.

In the Chilton's manual for 1984-1995 Accord and Prelude, section 4 page 21 it states " The CYL sensor is used to detect rhe position of No. 1 cylinder, the signal is used to trigger the sequential fuel injection"

Come on lets see YOUR reference material..

Then doubt it!!! I'm a master tech for 14 years for BMW. I know what I'm saying, I own 2 E30, one 84 and 85 both vehicle injectors fire at the same time. It's used to be call batch fire and I meant ALL 6 injectors LOL

[F20A CB7]

Then doubt it!!! I'm a master tech for 14 years for BMW.

Owned

[foamypirate]

Several GM V6's used batch fire injection as well. It's not like the fuel goes to waste; the atomized fuel just hangs around in the runner until that specific cylinders intake valves open.

It's not as efficient as sequential, but it does work.

[IAmTheNight]

There is such a thing as simultaneous and batch multiport fuel injection:

From Wikipedia:
"Multi-point fuel injection injects fuel into the intake port just upstream of the cylinder's intake valve, rather than at a central point within an intake manifold, referred to as SPFI, or single point fuel injection. MPFI (or just MPI) systems can be sequential, in which injection is timed to coincide with each cylinder's intake stroke, batched, in which fuel is injected to the cylinders in groups, without precise synchronization to any particular cylinder's intake stroke, or Simultaneous, in which fuel is injected at the same time to all the cylinders.

All modern EFI systems utilize sequential MPFI. Some Toyotas and other Japanese cars from the 1970s to the early 1990s used an application of Bosch's multipoint L-Jetronic system manufactured under license by DENSO."

Another read:
http://www.picoauto.com/tutorials/fuel-injection2.html


However, our Accords are sequential.

From Haynes manual:
"On these models, the crank angle sensor (CRANK) determines the timing for the fuel injection and ignition on each cylinder. It also detects engine RPM. The TDC sensor determines the ignition timing at start-up (engine cranking) and the CYL sensor determines the position of the cylinder for sequential fuel injection to each cylinder. All three sensors are built into the distributor.

Further reading:
http://en.wikipedia.org/wiki/PGM-FI

By the way, did anyone know that CB7Tuner is mentioned on the Honda Accord page on Wikipedia? I wonder who put that there....

[dano28]

Then doubt it!!! I'm a master tech for 14 years for BMW. I know what I'm saying, I own 2 E30, one 84 and 85 both vehicle injectors fire at the same time. It's used to be call batch fire and I meant ALL 6 injectors LOL

I assuming you are only addressing my statement that I never heard of any FI system that fired all injectors at the same time. Ok, I'm wrong about that but are you saying that the engines used in CB7's do NOT have sequential FI ?

What the hell is an E30 ??

[visualpoet]

I assuming you are only addressing my statement that I never heard of any FI system that fired all injectors at the same time. Ok, I'm wrong about that but are you saying that the engines used in CB7's do NOT have sequential FI ?

What the hell is an E30 ??

WTF? Are you trying to start a fight? He clearly said "I don't know on Honda. But in BMW...". He's not saying you're wrong, he's saying there are batch fired cars out there, that's all. Relax. E30 is a bmw chassis

[JoshM]

What the hell is an E30 ??

Yay Google!
http://en.wikipedia.org/wiki/BMW_E30

[Shag Wagon]

How long before this gets closed or deleted?? Or somebody gets banned.....

[visualpoet]

How long before this gets closed or deleted?? Or somebody gets banned.....

I haven't seen anything here that would require anything that drastic. It's just a discussion. No flaming or name calling or anything like that.

[dano28]

How long before this gets closed or deleted?? Or somebody gets banned.....

Yes, yes heaven forbid someone try to clear up an erroneous concept concerning 4th gen Accords. Besides, I already admitted that I was wrong about ALL fuel injection systems being sequential. That's more than most here will do if they are clearly wrong.

Besides, I can't be banned, I'm 73 and can say anything I want to.

[JoshM]

Besides, I can't be banned, I'm 73 and can say anything I want to.

Since when does age play a part in the "banning" process?

[visualpoet]

Since when does age play a part in the "banning" process?

He's "grandfathered" in?