I have an 89 iroc-z 305 TBI.
I'll be honest and let you know, I understand the basics to a combustion engine, but when I look at this one, I'm kinda overwhelmed. (I use to work on 90's Hondas.)
Does anyone have a good slide show, video, or anything that shows how the engine run/functions/works?
I can't really find anything other than people just starting their cars and hitting the gas.


(If you get on YouTube and search how (manual) transmissions or EGRs work, I'm looking for things like that.)

 

http://www.animatedengines.com/otto.html

 

That clears up some of the questions I had. But I was looking something more in depth about TBI 305s and 350s.

 

Works pretty much like any other EFI engine. o2 sensors determine if the engine needs less or more fuel, the computer makes adjustments, injectors fire.
The only difference is because the injectors are before the throttle plates the air they are exposed to is at a constant pressure, where as post throttle body injectors are subject to vacuum except when at WOT, when there is little or no vacuum in the manifold. Because of this they don't require vacuum reference fuel pressure regulators.

 

Started to lose me at the end.
More then likely it's because I'm just not familiar with these engines yet. That, and the jargon.

 

The terminology that I used is in no way specific to these motors or any brand in particular. If you did in fact no how to work on a 90's Honda than you should be familiar with those terms.

 

Then I was vague when I said worked on them. My apologies. I ment nothing professionally or properly trained. More like on my own in the drive way.
To better put it; what's broken? Where is it? How do I fix/replace it?
From there I either had to poke around, Google/YouTube it, and/Haynes Book it.
For the most part got all of it right but was some what on my own.

It all comes easy to me, but in no way do I know everything or at least all that I should.

 

Ok, well I'll start with the basics then, the 305s and 350s have gone basically unchanged since their origin. The first year of the 350 was 1967 and the 305 came about in 1976. They are all 8 cylinder, 16 valve V8s with a basic cam in block engine with lifters under the intake manifold, what is called the valley, and pushrods which extend up from the lifters thru the heads, where the rockers are actuated by the push rods and act on the valves. The 305 and 350 share a common crank, meaning they have the same stroke (up and down movement of the piston) with a different bore (diameter of the piston). There are many different variations of small blocks, the main differences being heads, pistons, cams, intakes, ect. The 305 TBI motor that is in your car as well as mine is known as an LO3. All chevy V8s are defined by a 3 character engine code like this, usually consisting of 2 letters followed by a number.

 

The intake system is a TBI, short for Throttle Body Injection which was first offered in F-bodies (Camaro's and Firebird's) in 1988. This consists of a 2 barrel throttle body with 2 fuel injectors mounted in it about the throttle plates, the flaps which open and close with the gas pedal. The two fuel injectors operate at a constant fuel pressure which is set by a pressure regulator located at the rear of the throttle body, I believe the small blocks were set to 12 PSI from the factory.

 

Alrighty.
Do you have a source for your information too?

That I get and understand. I know the crank shaft rotates the the distributor shaft (where some how the oil pump is connected) and as it turns to fire/send the spark to the wires and plugs, some kind of electromagnet sends a signal to the injectors to spray. The fuel I sprayed/sucked in by the vaccum of air where it is mixed. If I'm at all correct. Or am I jumping the gun a wee bit?

 

I don't have any particular source for my information, my dad was a chevy mechanic when he was younger so a lot of it comes from him, and he's never steered me wrong with anything SBC related. Some of it comes from this site.

The crank shaft does not drive the distributor/oil pump directly, the crank drives the cam, which then drives the distributor, which in turn drives the oil pump. There is a pickup coil inside the distributor, which I believe is what sends the signal to the ECU to drive the injectors, but don't quote me like that.

 

Heh. I'm learning as I go. Advise from here helps a lot. Bout the only way I learn other then my old YouTube method.
Best way to understand how something works is to know its history.

The reason I ask all of this though, as seen in all my other threads, my engine is completely FUBER when it comes to wires and vacuum lines. And once I get past that, then I'll need to know/understand the mechanics and moving parts.

 

google is my friend....

http://en.wikipedia.org/wiki/Fuel_injection