*excellent info* 93 specific info list
07-04-2005, 04:59 PM
#1
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Location: Kusel, Germany
Posts: 367
*excellent info* 93 specific info list
Since my original post made it so many pages, I have decided to clean it up and start a new one. I am just copying and pasting from the original so thanks for all the replies.
I have noticed a few posts about the differences that the 93's have. Soooo, here is a list that I have been working on for a while trying to find as many differences with the 93's as I can. If you have any other differences or corrections PLEASE let me know.
Mechanical
93's had slightly smaller front brake pads
93’s have “Pink” rods
Non-vented Optispark until 1995
Does not have a MAF (it is speed density)
93 had 2 different gearboxes. The M29 that came with the 3.23 car and the M28 that came with the 2.73 cars. Here are the transmission gear ratios:
M28 M29 94+
3.36 2.97 2.66 1st gear
2.07 2.07 1.78 2nd gear
1.35 1.43 1.30 3rd gear
1.00 1.00 1.00 4th gear
0.80 0.80 0.74 5th gear
0.62 0.62 0.50 6th gear
For gear change - You must change the speedo gear in the tailshaft of automatics. The speedometers on the '93 A4's were not electronic like in later years. M6’s require an electronic calibration box to correct speedo. However, the speedo can be corrected for 3.23 and numerically lower gears by modifying the eprom.
Headers/manifolds are different. EGR gasses are only taken from right above #8 cylinder. The tube above #1 is for air injection. (94+ have an extra hole on the passenger side for a 2nd A.I.R. input.
Fuel rails don't have a front x-over tube and thus use an intake manifold without the recess for it. The fuel line junction at the driver's side is near the TB instead of near the back (making it much easier to get at!).
93’s came with 22lb injectors instead of 24lb
The fuel system schrader valve is mounted on the drivers side fuel rail instead of behind the intake manifold.
93s are usually more responsive to fuel pressure changes. It must have something to do with having a speed density system.
Heater hose has a “T” in it going to the throttle body and also in the upper radiator return hose until the 1995 model.
The front brakes are different. I believe the rotors and pads are smaller (unconfirmed). I can measure my front brakes if someone with a newer lt1 can measure theirs.
Fuel pressure regulator is mounted on the passenger side as opposed to being on the driver side for 94+. Thus requiring a 93 specific FPR. TPI AFPR's are also useable on 93's.
93’s have a non-electronically controlled 4L60 automatic transmission (internals are swappable with 700R4’s).
The throttle body in an automatic equipped 93 has a connection for the TV cable. 94+ do not have the connection.
Pink rods instead of powdered metal rods (unconfirmed)
1.46” valve springs instead of 1.25” in the newer LT1’s (unconfirmed)
Oil pressure sender is directly above the oil filter instead of on the back of the intake manifold (unconfirmed that 94+ is on the manifold)
93’s have a metal fan on the CS 144 alternator and is rated @ 124 amps. The positive ‘bat’ wire for it is attached with a bolt.
The 94+ cars have a 140 amp alternator with a plastic fan. It uses a stud and nut to attach the positive 'BAT cable.
Hardened pushrods until 95
Traction control was not an option on 93's.
93 Formulas and Trans Ams did not have the 'performance shift' option.
93's only hold 4.5 quarts of engine oil according to the owners manual
93's only have the A.I.R. pump mounted to the frame. Later years are mounted to the engine block.
Electrical
93 is the only year 4th Gen that you can flash the computer codes by using a jumper wire between pins A & B (upper right 2 pins)on the DLC (under dash next to steering column). After the jumper is installed turn the ignition to "on" (not start). The engine light will then flash the codes. A 12 code will be given at the beginning and the end of the sequence which just tells you that the self diagnostic is good.
O2 sensors have only one wire and they are not heated. If converting to long tube headers you will have to upgrade to later heated style O2 sensors to keep them hot because they are moved further back.
Removeable computer chip instead of reprogramable PCM. This is actually nice if you are a tuner since all you have to do to change programming is swap chips. Although, that makes it a little tougher to do your own custom programming, as it requires burning your own chips. There is very little information out there about doing this.
1993 and early-1994 cars don't have dual speed fans making them much easier to put in a manual “on” switch. They have no #3 (J) fan relay. For these cars you can just ground D2 for the primary fan and F5 for the secondary one.
Batch fire injection (each pair of injectors fire simultaneously instead of individually) instead of port injection. No real detriment as far as performance or fuel mileage is concerned.
93s don’t have a provision for the lt4 knock module.
No CAGS on the M6 so you don’t have to worry about the annoying skip shift feature!
Temp guage on 93's start at 100*. 94+ temp guages start at 160*
Wire harness for the fuel injectors is not tagged with the position # as newer model f-bods are.
The "change oil" light is not used on 93's
Appearance
93's do not have the oil cap extension tube. The cap is connected directly to the valve cover.
Pontiacs could get steering wheel radio controls.
Chevys f-car had Yellow highlighted switches and instrument cluster the Pontiacs did not
93 Camaros do not have “Camaro” indented or printed on the passenger side air bag cover.
No stretchy stuff on the sun visors to hold things
93’s and 94’s are the only ones with a dot-matrix pattern on the t-tops
Chevys Did not have leather as an option, but the Pontiacs did
convertible was not available as an option
Pace car option was available
All 93 Z28 Camaros came with black tops standard. V6's couldn't get them. In later years it became an option.
All 93 TA's had the GT package with leather & upper level wing
For the best information concerning a 93 F-body visit the NEW Speed Density Board! http://www.speeddensity.org/
Last, but not least – The 93’s are just plain faster!
Still in question:
When did the change in wiper size come in to play?
Are the valve springs a different diameter than later model?
Can you correct the speedo for gearing other than 2.73’s or 3.23’s for 6-speeds by programming the chip?
I have noticed a few posts about the differences that the 93's have. Soooo, here is a list that I have been working on for a while trying to find as many differences with the 93's as I can. If you have any other differences or corrections PLEASE let me know.
Mechanical
93's had slightly smaller front brake pads
93’s have “Pink” rods
Non-vented Optispark until 1995
Does not have a MAF (it is speed density)
93 had 2 different gearboxes. The M29 that came with the 3.23 car and the M28 that came with the 2.73 cars. Here are the transmission gear ratios:
M28 M29 94+
3.36 2.97 2.66 1st gear
2.07 2.07 1.78 2nd gear
1.35 1.43 1.30 3rd gear
1.00 1.00 1.00 4th gear
0.80 0.80 0.74 5th gear
0.62 0.62 0.50 6th gear
For gear change - You must change the speedo gear in the tailshaft of automatics. The speedometers on the '93 A4's were not electronic like in later years. M6’s require an electronic calibration box to correct speedo. However, the speedo can be corrected for 3.23 and numerically lower gears by modifying the eprom.
Headers/manifolds are different. EGR gasses are only taken from right above #8 cylinder. The tube above #1 is for air injection. (94+ have an extra hole on the passenger side for a 2nd A.I.R. input.
Fuel rails don't have a front x-over tube and thus use an intake manifold without the recess for it. The fuel line junction at the driver's side is near the TB instead of near the back (making it much easier to get at!).
93’s came with 22lb injectors instead of 24lb
The fuel system schrader valve is mounted on the drivers side fuel rail instead of behind the intake manifold.
93s are usually more responsive to fuel pressure changes. It must have something to do with having a speed density system.
Heater hose has a “T” in it going to the throttle body and also in the upper radiator return hose until the 1995 model.
The front brakes are different. I believe the rotors and pads are smaller (unconfirmed). I can measure my front brakes if someone with a newer lt1 can measure theirs.
Fuel pressure regulator is mounted on the passenger side as opposed to being on the driver side for 94+. Thus requiring a 93 specific FPR. TPI AFPR's are also useable on 93's.
93’s have a non-electronically controlled 4L60 automatic transmission (internals are swappable with 700R4’s).
The throttle body in an automatic equipped 93 has a connection for the TV cable. 94+ do not have the connection.
Pink rods instead of powdered metal rods (unconfirmed)
1.46” valve springs instead of 1.25” in the newer LT1’s (unconfirmed)
Oil pressure sender is directly above the oil filter instead of on the back of the intake manifold (unconfirmed that 94+ is on the manifold)
93’s have a metal fan on the CS 144 alternator and is rated @ 124 amps. The positive ‘bat’ wire for it is attached with a bolt.
The 94+ cars have a 140 amp alternator with a plastic fan. It uses a stud and nut to attach the positive 'BAT cable.
Hardened pushrods until 95
Traction control was not an option on 93's.
93 Formulas and Trans Ams did not have the 'performance shift' option.
93's only hold 4.5 quarts of engine oil according to the owners manual
93's only have the A.I.R. pump mounted to the frame. Later years are mounted to the engine block.
Electrical
93 is the only year 4th Gen that you can flash the computer codes by using a jumper wire between pins A & B (upper right 2 pins)on the DLC (under dash next to steering column). After the jumper is installed turn the ignition to "on" (not start). The engine light will then flash the codes. A 12 code will be given at the beginning and the end of the sequence which just tells you that the self diagnostic is good.
O2 sensors have only one wire and they are not heated. If converting to long tube headers you will have to upgrade to later heated style O2 sensors to keep them hot because they are moved further back.
Removeable computer chip instead of reprogramable PCM. This is actually nice if you are a tuner since all you have to do to change programming is swap chips. Although, that makes it a little tougher to do your own custom programming, as it requires burning your own chips. There is very little information out there about doing this.
1993 and early-1994 cars don't have dual speed fans making them much easier to put in a manual “on” switch. They have no #3 (J) fan relay. For these cars you can just ground D2 for the primary fan and F5 for the secondary one.
Batch fire injection (each pair of injectors fire simultaneously instead of individually) instead of port injection. No real detriment as far as performance or fuel mileage is concerned.
93s don’t have a provision for the lt4 knock module.
No CAGS on the M6 so you don’t have to worry about the annoying skip shift feature!
Temp guage on 93's start at 100*. 94+ temp guages start at 160*
Wire harness for the fuel injectors is not tagged with the position # as newer model f-bods are.
The "change oil" light is not used on 93's
Appearance
93's do not have the oil cap extension tube. The cap is connected directly to the valve cover.
Pontiacs could get steering wheel radio controls.
Chevys f-car had Yellow highlighted switches and instrument cluster the Pontiacs did not
93 Camaros do not have “Camaro” indented or printed on the passenger side air bag cover.
No stretchy stuff on the sun visors to hold things
93’s and 94’s are the only ones with a dot-matrix pattern on the t-tops
Chevys Did not have leather as an option, but the Pontiacs did
convertible was not available as an option
Pace car option was available
All 93 Z28 Camaros came with black tops standard. V6's couldn't get them. In later years it became an option.
All 93 TA's had the GT package with leather & upper level wing
For the best information concerning a 93 F-body visit the NEW Speed Density Board! http://www.speeddensity.org/
Last, but not least – The 93’s are just plain faster!
Still in question:
When did the change in wiper size come in to play?
Are the valve springs a different diameter than later model?
Can you correct the speedo for gearing other than 2.73’s or 3.23’s for 6-speeds by programming the chip?
07-04-2005, 07:14 PM
#3
Registered User
Join Date: Oct 2002
Location: Stillwater, OK
Posts: 308
Re: *excellent info* 93 specific info list
A couple of quick questions..
1) Does my Automatic with a 3.23 rear have a 3 series carrier?
2) Where do I buy the 3.42 speedo gear for the 1993? Do they make them?
3) If my tranny needs a rebuild, can I buy a 'built' 700R4 and plug it in?
1) Does my Automatic with a 3.23 rear have a 3 series carrier?
2) Where do I buy the 3.42 speedo gear for the 1993? Do they make them?
3) If my tranny needs a rebuild, can I buy a 'built' 700R4 and plug it in?
07-04-2005, 10:04 PM
#4
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Join Date: Apr 2002
Location: South East Texas
Posts: 60
Re: *excellent info* 93 specific info list
This is refreshing. I haven't been on this site in probably over a year and I still remember that old 93 specific info post!
My 93 has leather, looks factory. Bought the car used, but have had it almost 10 yrs.
Holds 5 quarts of oil.
As for the auto, I'm pretty sure you can't just swap in a 700. The 4l60 was a non-electronic 4l60E. It shares most internals with a 700 though, but I think all 3 of them share a lot of parts. I don't think there is that much of a difference in price to justify a swap??
Something I've always noticed about my car is that it sounds different compared to a newer LT1 car with same exact exhaust. It is much more raspy, and I've had a couple people ask if it had a mild cam. Everyone I've known with a 94+ LT1 notices it. I've never known anyone with a 93 to compare it too. Let me know if anyone else has noticed this. I think somewhere I read that the 92-93 LT1 had different LSA??
Also, this is something I've noticed about it different from 94+. The starter sounds different(still stock), less cheap maybe. Sounds like it's spinning faster. When ever I start up a 94 it always sounds/feels cheap or something. Maybe the 93 has more insulation around that area? I guess the benefit of owning a first year car is that the cost cutters don't get too much of a hack at it.
My 93 has leather, looks factory. Bought the car used, but have had it almost 10 yrs.
Holds 5 quarts of oil.
As for the auto, I'm pretty sure you can't just swap in a 700. The 4l60 was a non-electronic 4l60E. It shares most internals with a 700 though, but I think all 3 of them share a lot of parts. I don't think there is that much of a difference in price to justify a swap??
Something I've always noticed about my car is that it sounds different compared to a newer LT1 car with same exact exhaust. It is much more raspy, and I've had a couple people ask if it had a mild cam. Everyone I've known with a 94+ LT1 notices it. I've never known anyone with a 93 to compare it too. Let me know if anyone else has noticed this. I think somewhere I read that the 92-93 LT1 had different LSA??
Also, this is something I've noticed about it different from 94+. The starter sounds different(still stock), less cheap maybe. Sounds like it's spinning faster. When ever I start up a 94 it always sounds/feels cheap or something. Maybe the 93 has more insulation around that area? I guess the benefit of owning a first year car is that the cost cutters don't get too much of a hack at it.
07-05-2005, 10:53 PM
#5
Registered User
Join Date: Jul 2005
Posts: 313
Re: *excellent info* 93 specific info list
i am pretty sure my car has 3.42 gears in the rear, i bought the car used, and he said it come with them factory..i guess he was mistaken..anyways...i have an important question...i was thinkin bout buying a 180 degree thermo. and one of my buddies said not to, because he had one and it did not run as good, so i called GM Performance and they said that he was correct, it was best to let the 192 degree factory thermo in it, because you will get the most out of your engine and fuel mi. would be better..this really puzzles me, can someone help me?
07-18-2005, 08:05 PM
#7
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Join Date: Mar 2002
Location: Waynesboro, PA
Posts: 4,827
Re: *excellent info* 93 specific info list
Couple of things:
Just because your car holds 5 quarts of oil doesn't mean that it's the factory recommendation. Recommendation for the 93's is 4.5 quarts.
3.23 ro 2.73 were the only gears available in the 93's. If it's got 3.42's then they were swapped in.
The "pink" statement was about the piston RODS. The factory 93 pushrods (and up to 95 IIRC) are hardened.
Just because your car holds 5 quarts of oil doesn't mean that it's the factory recommendation. Recommendation for the 93's is 4.5 quarts.
3.23 ro 2.73 were the only gears available in the 93's. If it's got 3.42's then they were swapped in.
The "pink" statement was about the piston RODS. The factory 93 pushrods (and up to 95 IIRC) are hardened.
06-14-2006, 08:30 PM
#9
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Join Date: Mar 2002
Location: Waynesboro, PA
Posts: 4,827
Re: *excellent info* 93 specific info list
Originally Posted by lethal93ta
some 93 cars with an M6 had 3.42 gears in them from factory, my friend has one of them. his was a rare yellow formula.
06-15-2006, 01:05 AM
#11
Registered User
Join Date: Jul 2002
Location: Palm Beach Gdns. Fl USA
Posts: 564
Re: *excellent info* 93 specific info list
this was the best thread years ago....and its still the best thread today...theres gotta be more stuff to add to the list...i always remember things when im working on the car to post here and add to the list...but off the top of my head i CANT REMEMBER~! happy 93' lt1 driving
Cory
Cory
06-15-2006, 01:49 AM
#12
Registered User
Join Date: May 2006
Posts: 27
Re: *excellent info* 93 specific info list
Originally Posted by 1993Fast_Z
i...i was thinkin bout buying a 180 degree thermo. and one of my buddies said not to, because he had one and it did not run as good, so i called GM Performance and they said that he was correct, it was best to let the 192 degree factory thermo in it, because you will get the most out of your engine and fuel mi. would be better..this really puzzles me, can someone help me?
I'm no expert, so I might be wrong, but I'm pretty sure someone on the board can answer your question.
06-15-2006, 07:46 AM
#13
Registered User
Join Date: Jun 2005
Location: Indiana
Posts: 1,834
Re: *excellent info* 93 specific info list
Originally Posted by Joe Gee
This is refreshing. I haven't been on this site in probably over a year and I still remember that old 93 specific info post!
My 93 has leather, looks factory. Bought the car used, but have had it almost 10 yrs.
Holds 5 quarts of oil.
As for the auto, I'm pretty sure you can't just swap in a 700. The 4l60 was a non-electronic 4l60E. It shares most internals with a 700 though, but I think all 3 of them share a lot of parts. I don't think there is that much of a difference in price to justify a swap??
Something I've always noticed about my car is that it sounds different compared to a newer LT1 car with same exact exhaust. It is much more raspy, and I've had a couple people ask if it had a mild cam. Everyone I've known with a 94+ LT1 notices it. I've never known anyone with a 93 to compare it too. Let me know if anyone else has noticed this. I think somewhere I read that the 92-93 LT1 had different LSA??
Also, this is something I've noticed about it different from 94+. The starter sounds different(still stock), less cheap maybe. Sounds like it's spinning faster. When ever I start up a 94 it always sounds/feels cheap or something. Maybe the 93 has more insulation around that area? I guess the benefit of owning a first year car is that the cost cutters don't get too much of a hack at it.
My 93 has leather, looks factory. Bought the car used, but have had it almost 10 yrs.
Holds 5 quarts of oil.
As for the auto, I'm pretty sure you can't just swap in a 700. The 4l60 was a non-electronic 4l60E. It shares most internals with a 700 though, but I think all 3 of them share a lot of parts. I don't think there is that much of a difference in price to justify a swap??
Something I've always noticed about my car is that it sounds different compared to a newer LT1 car with same exact exhaust. It is much more raspy, and I've had a couple people ask if it had a mild cam. Everyone I've known with a 94+ LT1 notices it. I've never known anyone with a 93 to compare it too. Let me know if anyone else has noticed this. I think somewhere I read that the 92-93 LT1 had different LSA??
Also, this is something I've noticed about it different from 94+. The starter sounds different(still stock), less cheap maybe. Sounds like it's spinning faster. When ever I start up a 94 it always sounds/feels cheap or something. Maybe the 93 has more insulation around that area? I guess the benefit of owning a first year car is that the cost cutters don't get too much of a hack at it.
06-15-2006, 02:43 PM
#15
Registered User
Join Date: Nov 2002
Location: jupiter, fl
Posts: 159
Re: *excellent info* 93 specific info list
Originally Posted by camaroRI
my 93 automatic had an electronic speedo? i dunno what your talkin aboooot..
oh and my 93 rear end v6 auto had 3.42 gears
oh and my 93 rear end v6 auto had 3.42 gears
as far as the speedo he is talking about the sensor in the rear of the tranny. a 93 auto v8 car was gear driven. 94 and up stll has a gear but is electronically driven.
oh and the thread is about v8 cars. i guess the v had the gears to help with lack of power. no offense to the car. just probably why.