Just purchased an 84 Z28, with 350 Block & 400 Turbo Trans. Was looking for fuel injectors but can't find, where are they? also was wondering what's this part that's just hanging from the motor. Will post pic.. all help would be thankful.

 

"Part hanging from motor" looks like the it used to be the O2 sensor connector.

Is this 350 TBI? TPI? otherwise (actually with performance potential maybe) port injected? Injected at all, as opposed to carbed?

 

I strongly believe it's TBI.. it's a edelbrock 350, with a Holley 4 barrel carb.. my only problem is, it'll turn over & run, but dies after you let off acceleration. Just trying to change out most of the fuel parts.

 

TBI stands for Throttle Body Injection. IF you have a CARB, that would indicate a carb car. Have you tried turning up the idle with the idle stop screw?
Oh, and you don't have fuel injectors. Try adjusting the parts you have before replacing any

 

Post us a pic of the top of your engine so we can clarify. Sounds like you got a carb. That is indeed the 02 sensor.

 

Edelbrock doesn't make 350s. They make various parts with their name on them that fit them, such that the engine might LOOK LIKE an "Edelbrock 350", with that name splashed all over everything; but in reality, it's not.

Fuel injection systems all rely on pressurized fuel being shot into the intake tract somewhere somehow. Most use injectors of some sort, which are little valves that can be opened in some precise fashion to control the amount of fuel being fed. Modern electronic ones all use electrically controlled injectors. They also use an oxygen sensor in the exhaust stream, to monitor the presence of oxygen, which information is then used by the electronic control system to adjust the amount of fuel it tells the injectors to feed to the engine.

TBI is a type of electronic fuel injection. So is TPI. Both of these types of EFI have been available on the 350 over the years.

A Holley carb is a ... carburetor. It is NOT fuel injection. Carburetors rely on the air flow through them producing a drop in the air pressure, which then "sucks" fuel into the intake. The fuel internal to them is at atmospheric pressure. Carbs were also used on 350s for many decades but are considered obsolete except for certain specialized applications, and even there, are being gradually supplanted as EFI systems become more capable.

If you have a Holley carb you do not need the O2 sensor, because it is not electronically controlled.

How do you know that it has a Turbo 400 transmission? This is not a trivial thing to transplant into one of these cars, unlike a 350 which is a direct bolt-in to a V8 one.

 

I think your confusion is coming from the O2 sensor.

The carbureted versions of these cars also has an O2 sensor so this is not an indication that it once had fuel injection.

Chances are the car was always carbed and someone just installed a Holley in place of the original computer command control (CCC) Quadrajet.

GD

 

 

Here's a pic.
The fuel filter is also in the fuel line of the carb, correct?

 

Yeah man no fuel injectors there, it's a Holley four barrel with electric choke. Fuel filter should be in the fuel line, I'm not familiar with a Holley but quadrajets have one that is behind where the fuel line threads into the carb. Also yours is a dual line, I'd do away with all the rubber fuel supply lines and get a hard line for it, most auto parts stores carry them.

 

Yup, that's all pretty much a hack job on top of that motor. If I had to name ONE THING that has caused the greatest number of cars to burn to the ground throughout time, it would be, rubber fuel lines.

Another thing that absolutely needs to go, is that Triangle Of Death thing on top of the carb. Those are NOTORIOUS for catching fire and dripping molten foam plastic goo into the carb where it re-solidifies and becomes all but impossible to remove especially from all the little orifices. Get that off of there ASAP and put a real air cleaner on it.

But yeah, that's a carb, not any kind of injection. No need for the O2 sensor except to plug the hole in the manifold.

Yes, the fuel filter would be in the fuel line leading to the carb, if there is a filter at all.

Why do you think that's a 350? It very well might not be, you know. Check the block casting number to be sure; conveniently located in the most accessible and conspicuous place possible: on top of the bell housing flange, behind the driver's side head. [/sarcasm]



NO OTHER piece of info will tell you FOR SURE what size the motor is. Strictly speaking, that one won't either; but at least it will tell you FOR SURE whether the block started out life with a 3.736", 4.000", 4.125", etc. bore dia.

 

get that thing up in the air and snap us a pic of the transmission pan as well, we can let ya know for sure what trans you got. And get rid of the heater hose with the tap in it for flushing the heater core that thing will eventually cause you to possibly toast your engine.

 

There are too many possible causes for that motor not idling to even start a list. One thing I see is the choke fully open. Assuming the engine was cold when you snapped the picture, the choke is disabled. That will make it not want to idle when cold. Next thing I see is black soot around the inside of the carb, indicating it's probably backfired atleast once. One thing Holley's are famous for is power valves that rupture when the motor backfires and then dump fuel into the engine.

One big red flag is that someone built a racecar not so well, ran it and then sold it. In between these two things they probably ran it hard. What kind of shape the motor is in is a big question.