Neil350
04-05-2013, 02:32 PM
A lot of the 93 guys seem to have questions which is understandable, owning a 93 for so long you begin learn they are just different enough to become annoying quickly. One thing to keep in mind, once you remove the engine harness and ECM, your 93 really isn’t much different than a 94 LT1 sans a few sensors, the intake manifold and location of the oil pressure switch.
Timing Cover: No OBDI LT1 timing cover will work, so that’s the same as any 94 or 95. If you’re retaining a stock style timing chain, you can use a 96-97 LT1 cover. There seems to be come misconceptions on the billet cover, that’s for double roller timing sets not necessarily a 93 thing.
Throttle Body: If you look at a 93 IAC versus a 94, the IAC in the 93s screw in to the bottom IAC plate, the later cars bolt in. Whoever builds your harness needs to know what syle IAC you plan to use. If you have any after market TB and want to convert to the newer style, you will need the newer style IAC housing. On the AS&M units, these units can be interchanged. If you’re looking at ordering a new Throttle Body and your car is a six speed, you can use any 94+ TB you want. 93 autos, if you plan to keep the factory 93 4L60, it will still need the provision for the kick down cable to attach to the throttle body. So keep that in mind when ordering or buying a throttle body.
ATI Dampner: You're going to need a new crank hub, the OBD1 cars didn't have a crank reluctor, so the hubs are essentially longer. When you order an ATI it's the same part for 93-97 F-bodies. What you will find is a spacer, this spacer is used for a OBD1 LT1 to space the hub out so you have proper belt alignment. When you do the 24X you do not use the spacer as it will not be needed. I run this with a GM bolt, works fine and the belt aligns with no issue. Not sure if that's an ATI thing only, Power Bond and a few others also make nice pieces for the LT1s.
Oil Pressure sending switch: All 93s have this by the oil drain plug and level switch on the driver side of the motor. I have heard early 94s may as well, you need to let who ever builds the harness know that so they extend the harness to reach your factory switch. I left mine in the stock location and it reads fine.
Intake Manifold: I am still using the 93 intake manifold and rails. My fuel pressure regulator is an aeromotive for a 94+ that was modified by Force Fed Fabrications to work on the 93 rails when they did the fuel line set up. But your intake will be fine.
Heated O2s: You will need heated O2s, I ordered some from a 94, they work fine.
Knock Sensor: the 96-97 Knock sensor will work in place of your original, that’s what I have on mine.
Gauge Cluster: All LT1 gauges will work with the exception of the tachometer which will need some programming changes in the PCM, that goes for all LT1 clusters. I am using a 93 gauge cluster in mine still, everything reads fine. My service engine light how ever does not work.
OBDII Communication Port: On the 93s, I believe the keyless entry is programmed using the OBDI port under the driver knee bolster (The thing you've been sticking paper clips in to flash codes), from what I can tell you would loose this functionality. I still have OBDI port taped off and tucked away.
Harness: The Harness I had built by EFI Connection routed and plugged in fine, under the passenger side of the dash it plugged in to the necessary connectors with no issues. No different than any other LT1 far as I know.
ABS/VATS: The ABS in my 93 functions with the 24X, VATS is disabled in the LS1 PCM. ShoeBox has a write up on to disable the VATS relay if you're concerned. Mine worked fine with out the relay disabled.
M29/M28/700R4: I am not using a 93 trans so I can’t comment on that. Some other folks here have how ever and I am sure they can comment.
Intake for MAF: If you ordered a cold air specific for a 93, it's going to be longer where it meets the elbow, you'll have to trim it back to fit a MAF sensor.
Other Notes: Other than those things, it’s no different than a 94+ car.
The A/C Still works, my cruise is gone so I can't comment on that.
Timing Cover: No OBDI LT1 timing cover will work, so that’s the same as any 94 or 95. If you’re retaining a stock style timing chain, you can use a 96-97 LT1 cover. There seems to be come misconceptions on the billet cover, that’s for double roller timing sets not necessarily a 93 thing.
Throttle Body: If you look at a 93 IAC versus a 94, the IAC in the 93s screw in to the bottom IAC plate, the later cars bolt in. Whoever builds your harness needs to know what syle IAC you plan to use. If you have any after market TB and want to convert to the newer style, you will need the newer style IAC housing. On the AS&M units, these units can be interchanged. If you’re looking at ordering a new Throttle Body and your car is a six speed, you can use any 94+ TB you want. 93 autos, if you plan to keep the factory 93 4L60, it will still need the provision for the kick down cable to attach to the throttle body. So keep that in mind when ordering or buying a throttle body.
ATI Dampner: You're going to need a new crank hub, the OBD1 cars didn't have a crank reluctor, so the hubs are essentially longer. When you order an ATI it's the same part for 93-97 F-bodies. What you will find is a spacer, this spacer is used for a OBD1 LT1 to space the hub out so you have proper belt alignment. When you do the 24X you do not use the spacer as it will not be needed. I run this with a GM bolt, works fine and the belt aligns with no issue. Not sure if that's an ATI thing only, Power Bond and a few others also make nice pieces for the LT1s.
Oil Pressure sending switch: All 93s have this by the oil drain plug and level switch on the driver side of the motor. I have heard early 94s may as well, you need to let who ever builds the harness know that so they extend the harness to reach your factory switch. I left mine in the stock location and it reads fine.
Intake Manifold: I am still using the 93 intake manifold and rails. My fuel pressure regulator is an aeromotive for a 94+ that was modified by Force Fed Fabrications to work on the 93 rails when they did the fuel line set up. But your intake will be fine.
Heated O2s: You will need heated O2s, I ordered some from a 94, they work fine.
Knock Sensor: the 96-97 Knock sensor will work in place of your original, that’s what I have on mine.
Gauge Cluster: All LT1 gauges will work with the exception of the tachometer which will need some programming changes in the PCM, that goes for all LT1 clusters. I am using a 93 gauge cluster in mine still, everything reads fine. My service engine light how ever does not work.
OBDII Communication Port: On the 93s, I believe the keyless entry is programmed using the OBDI port under the driver knee bolster (The thing you've been sticking paper clips in to flash codes), from what I can tell you would loose this functionality. I still have OBDI port taped off and tucked away.
Harness: The Harness I had built by EFI Connection routed and plugged in fine, under the passenger side of the dash it plugged in to the necessary connectors with no issues. No different than any other LT1 far as I know.
ABS/VATS: The ABS in my 93 functions with the 24X, VATS is disabled in the LS1 PCM. ShoeBox has a write up on to disable the VATS relay if you're concerned. Mine worked fine with out the relay disabled.
M29/M28/700R4: I am not using a 93 trans so I can’t comment on that. Some other folks here have how ever and I am sure they can comment.
Intake for MAF: If you ordered a cold air specific for a 93, it's going to be longer where it meets the elbow, you'll have to trim it back to fit a MAF sensor.
Other Notes: Other than those things, it’s no different than a 94+ car.
The A/C Still works, my cruise is gone so I can't comment on that.