Should all bolt on, even if the parts are not absolutely identical. The throttle bodies are likely to have casting differences that will not affect how it runs and drives. Buy the correct gasket for the throttle body, install on your intake manifold.

One issue you'll have to deal with is the different connector required on the TPS--the early 3-in-a-row connector, versus the later 3-in-a-circle.

For the record, I don't have a lot of faith in the small-cap HEI distributor. They're all high-mileage and old by now. It will be worth your time to inspect the cap, rotor, pickup coil and plug wires. Cap, rotor, and plug wires are easy. The pickup coil magnets crack or become weak, leading to poor signal triggering the module--and therefore misfire. Delco modules are as reliable as any other HEI, which is to say they're world-class. Same with the Delco ignition coils. It's not impossible for them to fail...it's just unlikely without a heap of time and miles.

https://www.thirdgen.org/forums/tbi/...ces-5-7-a.html

 

Thanks for the reply, do you know if I can just install a TPS made for a 1987 into the 93 TB. Hate having to cut and splice if I don't have to. Good fortune the 93 has a near new distributor so I will put that in. The Blazer has sat since 2012 give or take. I put a new battery in it and spun the starter to see if it was locked up. Turned over well enough. The fuel line coughed up some orange stuff that use to be fuel. Not sure how to drain the tank, it says it has 1/8 left. pulled the filter and cycled the key but no more fuel flow. Bad pump?

 

If the '87 has the 700R4 auto, the '93 TBI may not have the stud for the TV cable. By '93 the auto's were E automatics, no TV cable. Just something to check for before hand.

RBob.

 

The 93 is a 5 speed so your probably right its not there. Can I just by a stud and bolt it on the linkage the way carbs use to? I think I got the fuel pump thing figured out. It sprays for a second while cranking but wont free run with the key on? Im going to invest in a fuel psi gauge and mount it at the TB. I have a feeling this thing will take some trouble shooting to run.

 

Fuel pump "primes" for two seconds after the key is turned "on". It has to be off for a few seconds to run the "prime" cycle again.

You wouldn't want the fuel pump to run whenever the key is on; in a collision the fuel pump would stay energized, potentially spraying fuel out of ruptured fuel plumbing.

The pump stays on when the ECM detects that the crankshaft is turning; or when the engine has oil pressure. You could jump the oil pressure switch harness together to run the fuel pump. Some harnesses have a pigtail that can be touched to battery power which will run the pump.

 

Thanks for the fuel pump info. Is the oil psi switch the sender that's mounted just to the right of the distributor on back of the block? I just put a new cap and rotor and coil in it. Cranked it and it has spark. Might be hope yet.

 

Maybe. I thought the two connector styles could be interchanged by buying the correct sensor for the "other" application. After looking at a very limited number of throttle-body assemblies, I see that the one that I own which uses the "round" style TPS uses a different sensor-mounting system than the several I have which use the flat, in-line style sensor. It may be that there is a sensor style that will fit and have the right connector--I just don't know what the part number would be.
Yes. The oil pressure switch on top of the block is for the fuel pump, the sending unit on the side by the oil filter is for the dash gauge. For the record, the sending unit by the oil filter is a high-failure item. They read high. Or they read low. And sometimes when you remove them from the engine, they weigh a ton and slosh from all the oil trapped inside that shouldn't be there. Some suppliers sell a sending unit that's supposed to fit, but the outside diameter is too large. I went crazy trying to find one that would actually fit, the last time I needed one.

 

Ok so I jumped the oil switch. Much to my surprise it flipped on the fuel pump on even while ignition key was off. But it ran the tank out so Im happy about that. Pump did not shoot out fuel, but just kinda ran. About as fast as a syphon hose would with gravity. Weak pump? Well that's a drag about the sensor mounting. The local junkyard here has nothing even close to 1987 as everything gets crushed. I wonder if the TPS wire harness can just be cut and spliced in to function. I hate hack job wiring.

 

I found this adapter. IS this what I need to use the 93 TB. https://warrperformance.com/?product...ripack-tbi-tpi
Is there any other connections to consider? Also Can the 700 TV cable stud be added to the late TB.

 

Looks good to me.

Can't help you there. As long as there's a hole in the throttle arm, or material in the right place to drill a hole...sure.

Location will be critical. It won't take much error to make problems.