School me on TBI in my 91 K5

[84CUCV]

Well, how does it work? Not sure at all. Is there a way to give me a run down? also, some pros and cons would be great as well. thx

 

[stkcode]

Pros....

- Can run at steep angles
- Can adjust for elevation changes (advance/retart timing)
- Better cold engine starts
- Slightly better fuel economy
- No more vapor lock
- Small improvement in power (not much)
- Cheaper than mpfi (to convert to / modify)

Cons....

- Harder to limp home on, depending on what goes on early retirement (sensors, fuel pump, etc.)
- Can be harder to diagnose a bad sensor, as another circumstance maybe creating the false readings.
- Not as efficient as mpfi, since fuel still atomizes in the intake like a carb.
- OBD is not as nice as OBD II
- Still uses mechanical distributor/throttle linkage (can't bump the timing as quickly/easily as with newer motors)

 

[84CUCV]

What is ORD and MPFI? thx

 

[stkcode]

As I recall, OBD stands for On Board Diagnostics.

MPFI stands for Multiport Fuel Injection, where their are one injector per cylinder, located in the intake, generally fed from 2 fuel rails (one per side). The throttle body in MPFI acts as an air valve.

You may wish to visit:

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

 

[GMCJason]

There's a lot of information here, too:

http://www.fullsizechevy.com/forums/...d.php?t=212064

Get's more into performance issues but those questions will come soon enough, just wait.

 

[84CUCV]

thx guys