Hi there everybody, still looking at options for my 1993 firehawk, was working on other projects and now I will start on this firehawk, and have some questions looking for some advice, well I inherit a 1993 firehawk automatic, the engine is seized overheated, any way I am looking at several options and a neighbor is selling his 1994 firebird for cheap, engine and transmission run great salvage title , what issues will i encounter with this engine swap?
thank you

 

Fuel lines in the engine bay are different, as is the injector/ fuel rail. 1993 is ECM with a chip, 94 is PCM with flash EEPROM. Engine harness is different. Move the fuel lines, PCM and harness with the engine. The 93 4L60 is just a 700R4 with a different name, no electronic control except torque converter lockup signal, so for the 94 trans (4L60E) the engine harness and PCM would be needed to control it. Different gearing in the 93 4L60 given to most if not all of the F-Bodies, but that's beside the point. Injectors in the 93 were 22# instead of 24# but also irrelevant if you're doing the swap.


If you go ahead with this, post some pics of the progress and keep the questions coming.


See if you can find your car here for kicks:
http://www.firehawkowners.com/year/1993.html

 

I assume from your post, that you are saying to transfer the ecm from the 1994 into the 1993 and transmission from 1994 to 1993, what do I need need to do to keep both the 1993 ecm and 1993 transmission, and just transfer the 1994 engine into the 1993?

 

If you're looking from a simplicity stand point, just use the bare long block from the 94. Reuse your 93 intake manifold with throttle body, injectors and rails, exhaust, emissions equipment if you keep it, engine harness and 93 transmission. Done. If you have a bare 94 long block and a 93 long block next to one another, the only real difference you'll notice off hand is that the 93 has the oil pressure sending unit by the filter where as the 94 has it in the back. You can leave it there if you want. What makes 93s different is all the stuff that goes on the motor. Plenty of people have converted 93s to the later 94+ PCM for ease of tuning.

Why should you reuse your complete 93 intake manifold? The fuel rails are different for one, the throttle body on your 93 is different from the 94. How is it different? Because 93s had a provision for a kick down cable on the linkage for automatics, secondly 93s had a different IAC on the throttle body. The later cars bolted in, 93s screw in and the pig tail is different.

Engine Harness: Very different from the 94, ECM vs PCM, single wire oxygen sensor, different IAC. Just reuse the 93 if you want to get it running for now. If you feel later down the road you want to convert to MAF you'll have the stuff to do it. Both cars if stock will have unvented opti sparks.

Transmission: If you're car is an auto, you need the 93 specific throttle body.

Exhaust manifolds: 93 EGR is different than 94, it screws in to the back cylinder, where the later cars had a flange. Also 93s, the air pump only hooked to the driver side, later cars it crossed over to both manifolds I believe. Just reuse the 93 stuff if you want to keep smog.

Accessories: You can reuse the 94 stuff if you wanted, 93s had a specific suction/discharge hose on the A/C but the later compressors will work. I am not sure really what all was different there. 94s had a better alternator, I'd use that. Power steering pump shouldn't be an issue. Harmonic balancer will be the same.

 

Thank you BizZzatch350 and Gojira94 very informative post thanks indeed , if i was to move the harness and computer from the 1994 to 1993 what issues should I expect to get all the gauges to work, sorry if it is a dumb question but I'm new to lt1s, will all the gauges work or I need to do some tweaking

 

It should all work fine. I run an LS1 PCM in my 93, still has the factory gauges. Is this car an auto originally, probably would want to use the 94 trans if you had it.

 

Older post some wiring involved. For you case, just reuse the 93 ECM

https://ls1tech.com/forums/lt1-lt4-m...cm-93-z28.html

 

I'm liking the idea of transferring everything including transmission 4l60e from the 1994 to 1993, since i have the complete 1994 car as a donor, besides this two wiring connectors anything else that will prevent the car to start and drive,? Also any issues with the transmission swap? Thanks in advance

 

If you do that you'll need to reuse the 94's injectors since they're larger and the 94's throttle body due to the different IAC pig tail as earlier mentioned. I would still reuse the 93s intake manifold and fuel rails for simplicity. The transmission will bolt in the same, drive shaft, torque arm and all that. Far as not starting VATS will not be an issue as the key hasn't changed. Back in the 90s a lot of guys swapped to the 94+ PCM set ups for local tuning capability. I know MTI did it on some customer's 93s when they still worked on them back in the 90s. So you're not in uncharted territory just territory seldom traveled these days. I am sure if you search the archives on CZ28.com you can find threads on this.

 

ok, I know from the simplicity standpoint, would be to just move everything from the 93 to 94 block, my main concern is that this 1994 firebird is running 13s on the quarter mile with stock ecu, just a mild cam, I don't know the horsepower rating on the 1994, but my question is will the 1993 22 injectors decrease the acceleration on the 1994 engine, the 1994 also has a 2500 stall converter, which im pretty sure i can reuse on the 700r4 from the 1993, do you guys think this by transferring only the block from the 1994 to the 1993 will I get this numbers too on the 1993?

 

Ok I got a deal on a 1994 camaro started with engine swap already here are some pics of the camaro engine bay and the firehawk engine bay, will keep it simple and just go the bare block swap 1993 firehawk
1994 camaro
1994 camaro
Engine out from the camaro

 

You could reuse the converter for a little added performance. Looks like the other motors had some headers as well. 93 injectors won't hurt it, my 93 when it was bolt ons ran the stock injectors. The cam may cause issues with the tune depending on how aggressive it is. You may be able to get away with it. If it was running the stock tune, it either is a super mild cam or it had a lot on the table left. For example my 93 with Long Tubes, cold air and converter was in the high 12s.

 

Try to find out what cam it has then get a tune/chip. http://www.pcmofnc.com/product-categ...-86-92-tuning/

 

Check that converter swap, I believe the early LS1 Corvette converters will work in the 700R4. However the 4L60E Fbody converter is somewhat different and will not work in a 700R4.

 

The torque converter is a 30 spline which will fit the 700R4- 4l60e from 1986-2007.

 

My error, the the early LS1 Corvette converter fits the 4l60, it's the early LS1 Fbody that's different.

 

Ok I have the engine installed already still putting water pump and accessories what do I do with the oil sending unit as they have different locations on the blocks? The 94 block Is in the 93 engine bay already, Any help on this is appreciated ? How do I get this to work?

 

Use your old sensor from the '93 or buy new, mount it above the oil filter where it goes. Leave the other alone.

 

Thank you! so once again to recap sorry I'm a bit slow, so I use the 1993 oil sending unit, insert it on the 1994 block near the oil filter and for the hole behind the intake I cover it, is that correct? more pictures of 1994 engine in 1993 engine bay attached 


 

Yes, remove the plug above the filter and use it to plug the '94 sensor hole.