4th Generation (1993 - Present)
4.8 Miscellaneous
Q:
I heard that starting in 1999 GM has included a "black box" in the F-bodies and Corvettes that can tell what was happening in my car during a crash. Is this true, and if so, what does this black box record?A:
Yes, there is a black box, which records data from your car right before an accident. However this isn't new. Reports as far back as 1992 say there has been a device in these cars that record air bag and ABS activity during an accident. These devices were rumored to record data only on the moment of impact. More recently, these new devices record data up to 5 seconds before an impact. The things that are supposedly recorded are:These devices were originally installed for field research purposes only. Having these devices in our cars gives GM more information about what happens to their cars during tests. This information can also help GM in legal situations where the effectiveness of their safety systems is in question. There has been no known cases thus far about this information being used against the driver of the vehicle. There is also no known way to defeat this system.
Q:
Where can I get ramps for my F-Body? None seem to work.A:
There are a couple of brands that work. Rhino and Tru-Cut Automotive both sell ramps that will work. Tru-Cut Automotive ramps have an availble (optional) "Extension Kit" that will allow for lowered vehicals to drive up them without scraping, and should be available at Pep Boys, K-Mart and Autozone to name a few.
Q:
Why does the gas gauge plummet after the 1/2 mark?A:
The main reason for this, is that the gas tank is sort of shaped like a 'V'. The gauge just takes the depth of gas in the tank. As gas gets lower down in the tank, it's used faster than at the top of the tank due to the smaller volume. Thus gas is used quicker. The half way mark is actually only 1/3 full. So when the needle starts going towards the 'E', find the next gas station because 'E' is means EMPTY.
Q:
Why does the trip odometer on my 1999 F-body sometimes reset back to 0 during cold weather? I know I didn't reset it.A:
There is a Technical Service Bulletin that you can refer to when taking you car into the dealer for it. Apparently its something wrong with the gauge cluster on the 1999s only. The TSB number is 99-08-49-009. The problem only exists when the car is cold and the battery drops below approximately 85% normal operating voltage. This causes the instrument cluster to reset itself. The regular odometer is not affected, and no other areas of the car are affected.
Q:
How does the PASS-Key II system work?A:
PASS-Key II works with a small resistor chip embedded in your ignition key. This chip gives a certain resistance. When the ignition key is inserted into the car for the very first time at the factory the computer controller memorizes the exact resistance of that chip and will not start again w/o it.This provides pretty good protection against all but the more sophisticated thief. A knowledgeable thief can get around it with the right equipment, but the time to steal goes up considerably.
Q:
How can I display the error codes from a Service Engine Light?A:
According to the 1994 F-Carline Service Manual, page 6E-6 states in part:"Although it is recommended that a diagnostic scan tool be used to read diagnostic trouble code(s), it may be possible to flash trouble codes on certain vehicles equipped with a 12 pin DLC connector."
If your car does not have the 12 pin DLC connector, you may not be able to manually "flash" your trouble codes. The language "may be possible" appears to suggest that this method should work with most, if not all, 12 pin DLC equipped cars.
THE CONNECTOR ----------------------- | 1 2 3 4 5 6 | | 7 8 9 10 11 12 | ----------------------- Pin 6 = Ground 5 = Diagnostic Terminal 2,12 = Serial data 1 = TCC (Torque Converter Clutch Solenoid)
DISPLAYING THE TROUBLE CODES
Some people with 94 models and on have had trouble using the following method, but it still won't hurt to try it. Ground Pin 5, the diagnostic terminal (into Pin 6), with the ignition off - then turn the ignition to the on position without starting the engine will flash the "Service Engine Soon" light in the following sequence. flash, pause, flash-flash, long pause flash, pause, flash-flash, long pause flash, pause, flash-flash, long pause Following this "12" code repeating three times will come
any trouble codes stored, flashing each of them three times. If you do not see the "12" flash three times, your diagnostic circuit could be defective. Otherwise you probably need a GM scan tool.
Some vehicles will display stored trouble codes, then "12" again, followed by energizing "most system controlled relays." The fuel pump relay will not energize. The idle air control valve will fully extend to enable checking minimum idle speed.
FIELD SERVICE MODE
Starting the engine with pin 5 grounded will place the system in "Field Service Mode" Open loop will result in the Service Engine Soon light flashing more than twice per second. Closed loop will result in (1) Light flashing once per second, (2) Light staying off when running lean, and (3) Light staying on if running rich.
CLEARING THE TROUBLE CODES
Turn the keyswitch to the off position. To clear any trouble codes, disconnect the power feed for 30 seconds. If this is done at the battery, and your car stereo is equipped and programmed with a four digit pin code, you may have to re-enter that as well to use your stereo again. A better place to remove power is at the fuse.
13. Open circuit at left oxygen sensor 14. High temperature indicated at engine coolant temp. sensor 15. Low temperature indicated at engine coolant temp. sensor 16. Low voltage at battery 17. Circuit fault/error at camshaft position sensor 18-20. N/A 21. High voltage at throttle position sensor 22. Low voltage at throttle position sensor 23. Low temperature at intake air temperature sensor 24. Fault in vehicle speed sensor 25. High temperature at intake air temperature sensor 26-27. N/A 28. Fault in transmission pressure switch assembly 29-32. N/A 33. High voltage (low vacuum) at manifold pressure sensor 34. Low voltage (high vacuum) at manifold pressure sensor 35. Idle speed can not be set to desired RPM 36. 24X signal 37. Fault in torque converter clutch brake switch 38. N/A 39. Fault in torque converter clutch circuit 40. N/A 41. Fault in ignition control timing circuit 42. Error in ignition control 43. Fault in knock sensor circuit 44. Left oxygen sensor lean 45. Left oxygen sensor rich 46. PASS-Key II circuit 47-50. N/A 51. PROM error 52. N/A 53. High voltage at battery 54. Low voltage at fuel pump 55-57. N/A 58. High temperature in transmission fluid 59. Low temperature in transmission fluid 60. N/A 61. A/C performance 62. N/A 63. Right oxygen sensor open circuit 64. Right oxygen sensor lean 65. Right oxygen sensor rich 66. Low A/C refrigerant pressure 67. A/C refrigerant pressure circuit error 68. A/C compressor relay short circuit 69. A/C compressor relay open circuit 70. High A/C refrigerant pressure 71. Low temperature at A/C evaporator 72. Signal error at vehicle speed sensor 73. High temperature at A/C evaporator 74. N/A 75. EGR solenoid #1 error 76. EGR solenoid #2 error 77. EGR solenoid #3 error 78. N/A 79. Transmission fluid hot 80. Transmission slipping 81. N/A 82. 3X signal, ignition control error 83. N/A 84. CAGS open circuit (95's and up only) 85. PROM error 86. Analog to digital converter error 87. EEPROM error 88-89. N/A 90. Torque converter clutch error 91-92. N/A 93. Pressure control solenoid Circuit current error 97. Voltage low in transmission system 98-99. Invalid PCM Program Q: How can I determine a particular wire by its color and location?
A:
The wires can be found as follows:UNIT/OPERATION WIRE COLOR POL WIRE LOCATION -------------- ---------- --- ------------- 12V red + ignition harness Starter yellow (or purple) + ignition harness Ignition pink + ignition harness Accessory orange (must enable) + right of dr.kick panel Tach white or white/black ac coil/dist. assembly * Power Lock lt. blue ** 5wi either kick panel - Power Unlock dk. blue ** 5wi test from pass. sw. Parking Lights brown drivers kick panel Door Trigger white - behind left rear spkr Headlights yellow + Wiper green + black conn. steer col. L.F. Win Up/dwn dk. blue - brown A in drivers door R.F. Win Up/dwn lt. blue - tan **** A in drivers door Trunk Pin same as door trigger - Trunk Release black + at switch Horn Trigger black - black conn. st. column Brake Wire yellow + at brake switch Reverse Lights green + black conn. st. column * White for the V6 and white/black for the V8. ** For keyless-entry versions, there are also red/black and orange/black lock wires in the passenger kick panel which are 5-wire and still mastered from the passenger switch. *** There are also gray/black in drivers kick panel (non-delay without connection for trunk). The gray may be found in the harness below the speaker. So do not use the orange wires from dome light and door lock B+ circuits for 12V source as they shut off with timer. **** Bypass module for drivers window and connect directly to motor leads. In passenger door motor wires are dark blue and brown.
|
Red |
Blue |
Grey |
Black |
1 |
Crank Sensor (96 only) |
GND |
IAC Coil A High |
A/C Request |
2 |
GND |
Trans Press Control Sol Low |
IAC Coil A Low |
Low Resolution Signal |
3 |
Injector # 1 |
Ignition Positive Voltage |
Right Rear O2 Low(96 only) |
Distributor Ref Low |
4 |
Injector # 4 |
|
Right Rear O2 High (96 only) |
|
5 |
Injector # 6 |
|
IAC Coil B Low |
Ignition Control |
6 |
Injector # 7 |
Trans TCC PWM Sol |
IAC Coil B High |
Sensor GND |
7 |
FP relay |
Serial Data Class 2(96 only) |
Right Front O2 Low |
Trans 1-2 Shift Control |
8 |
|
A/C Clutch Control |
Right Front O2 High |
VSS Out |
9 |
EGR Control |
MIL Control |
|
|
10 |
Cooling Fan R2&3 |
EVAP Purge Sol. |
|
|
11 |
Cooling Fan R1 |
Trans TCC Sol. |
TCS Active signal |
|
12 |
EBTCM TP sensor Signal |
A/C Pressure sensor |
|
Trans 2-3 Shift Control |
13 |
Tachometer Out |
|
Performance Mode Switch Signal |
Skip Shift Control or 3-2 downshift |
14 |
Air Pump Relay |
|
Brake Signal Switch |
Distributor Ignition feed |
15 |
Trans Mode Lamp Control |
Skip Shift Lamp |
PNP Switch |
+12V Battery |
16 |
|
|
Trans Pressure Control Sol. |
Sensor GND |
17 |
|
|
Left Rear O2 low(96 only) |
|
18 |
GND |
|
Left Rear O2 High(96 only) |
|
19 |
Injector # 2 |
|
Left Front O2 Low |
MAF signal |
20 |
Injector # 5 |
Output/Field service Enable |
Left Front O2 High |
High Resolution Signal |
21 |
Injector # 3 |
|
IAT sensor |
A/C Clutch Status |
22 |
Injector # 8 |
Knock Sensor |
TP sensor |
|
23 |
TCS Retard Control |
|
MAP sensor |
EVAP Vacuum Switch (96 only) |
24 |
|
A/C Temp Sensor |
|
|
25 |
Fuel Enable signal |
|
ECT sensor |
|
26 |
|
|
|
|
27 |
|
|
|
|
28 |
|
Trans Fluid Temp Sensor |
Trans Range Signal A |
5 Volt Reference |
29 |
|
|
Trans Range Signal B |
5 Volt Reference |
30 |
|
Serial Data |
Trans Range C |
Ignition Positive Voltage |
31 |
VSS Signal Low |
|
|
Bat Positive voltage |
32 |
VSS Signal High |
|
GND |
|
Q:
Why do the fans and service engine light come on just after cold start?A:
It's probably a blown air pump fuse (20 amp). Take the cover off the fuse box under the hood and locate the fuse. If it's blown, simply replace it. If it keeps blowing, then you probably have a faulty air pump which should be replaced as per the Technical Service Bulletin (#636502).
Q:
How fast is my LT1 car?A:
Numbers are always different depending on who drove the car, how it was driven, the conditions of the track, how much weight was in the car, etc. And of course every car is not created equal. However these numbers, taken from the August '94 Chevy High Performance magazine, will give you an idea.GM's advertised numbers are:
0-60 1/4 mile Top Speed Model ---- ------------ --------- ---------------- 6.1 14.8 @ 97 155 Z28 Coupe 6.3 14.8 @ 97 155 Trans Am Coupe M6 4.9 13.5 @ 104 160 Firehawk Coupe M6
Auto magazine reviews resulted in:
Magazine Date Page 0-60 1/4 mile Top Speed Model -------- ----- ---- ---- ------------ --------- ----------------- C&D 01/93 121 5.4 14.2 @ 99 153 Formula Coupe M6 MT 01/93 52 6.2 14.7 @ 96.9 n/a Z28 Coupe M6 MT 01/93 80 6.3 14.8 @ 97.6 n/a Trans Am Coupe M6 R&T 01/93 6.3 14.8 @ 95.5 n/a Trans Am Coupe C&D 02/93 32 5.3 14.0 @ 100 154 Z28 Coupe M6 C&D 02/93 32 5.5 14.2 @ 99 152 Formula Coupe M6 MT 02/93 41 5.6 14.0 @ 98.8 n/a Z28 Coupe M6 MT 06/93 52 5.8 14.4 @ 97.9 151 Z28 Coupe M6 MT 06/93 52 6.1 14.7 @ 97.2 152 Formula Coupe M6 MT 08/93 82 5.8 14.4 @ 97.9 n/a Z28 Coupe M6 C&D 10/93 5.8 14.6 @ 97 104 Z28 Ragtop M6 CR 10/93 682 6.6 15.1 @ 94 n/a Trans Am Coupe A4 MT 10/93 36 6.2 14.5 @ 96.2 n/a Z28 Ragtop A4 AW 11/22/93 19 5.8 14.3 @ 99 n/a Z28 Coupe M6 C&D 12/93 5.4 14.1 @ 101 156 Z28 Coupe M6 R&T Spec 1994 6.2 14.8 @ 95.1 n/a Z28 Coupe C&D 08/94 6.1 14.6 @ 96 153 Trans Am Coupe A4 MT 08/94 41 5.7 14.2 @ 98.8 159.3 Z28 Coupe M6 R&T Sport 1995 53 6.3 14.8 @ 95.5 n/a Z28 Coupe M6 R&T Sport 1995 130 6.7 15.1 @ 95.0 n/a Formula Ragtop M6 AM 06/95 53 n/a n/a 152 Trans Am Coupe M6 AM 06/95 56 n/a n/a 155 Z28 Coupe M6 R&T 06/95 79 6.4 14.9 @ 93.6 155.3 Z28 Coupe M6 R&T 06/95 90 6.5 14.9 @ 93.9 157.8 Trans Am Coupe A4 MT 07/95 51 5.6 14.0 @ 101.6 157 Trans Am Coupe M6 MT 07/95 48 5.7 14.2 @ 100.2 155 Z28 Coupe M6 C&D 06/97 50 5.3 13.9 @ 104 159 Trans Am Coupe M6 (1998) CHP 04/98 40 n/a 13.34 @ 105.75 n/a Z28 Coupe M6 (1998)
Other cars reviewed in the auto magazines include:
Magazine Date Page 0-60 1/4 mile Top Speed Model -------- ----- ---- ---- ------------ --------- ---------------- C&D 06/93 9.2 17.0 @ 79 110 3.4 Camaro Coupe A4 PP 06/93 6.2 14.7 @ 96.9 n/a Z28 Coupe M6 MT 07/93 49 4.9 13.5 @ 103.5 n/a Firehawk Coupe M6 MT 09/93 51 9.7 16.8 @ 77.6 n/a 3.4 Camaro Coupe A4 CR 10/93 682 9.8 17.3 @ 79 n/a 3.4 Camaro Coupe A4 C&D 05/94 8.9 16.8 @ 82 107 3.4 Camaro Coupe M5 C&D 04/95 4.1 12.6 @ 114 183 Lingenfelter 383 M6 MT 05/95 76 5.3 13.9 @ 103.6 n/a Firehawk Coupe M6 MT 05/95 102 7.4 15.7 @ 88.3 n/a 3800 Camaro Coupe A4 MT Spec 05/95 4.9 13.4 @ 109.7 n/a Rippie Camaro M6 MT Spec 05/95 5.1 13.3 @ 113.1 n/a Lingenfelter 383 M6 MT Spec 05/95 5.1 13.2 @ 111.0 n/a Paxton Camaro M6 MT Spec 05/95 5.1 13.5 @ 107.4 n/a Vortech Tran Am M6 C&D 06/95 4.8 13.3 @ 109 172 Callaway Camaro C8 M6 R&T 06/95 79 5.2 13.6 @ 110.2 177.1 Vortech Camaro M6 R&T 06/95 89 4.5 12.7 @ 114.7 192.1 Lingenfelter 383 M6 C&D 07/95 7.7 15.9 @ 86 114 3800 Camaro Coupe A4 Key to Magazines: ---------------- AM Automobile AW Autoweek C&D Car and Driver CR Consumer Reports MT Motor Trend PP Petersen's Performance Cars R&T Road & Track CHP Chevy High PerformanceHow fast is my LS1 car?
A:
Once again, each car will perform differently, however various magazines have tested the new cars, and came up with quarter mile times between 13.6 and 13.9 stock for 1/4 mile times, and top speeds between 160 for the Camaro to 162 for the Trans Am WS6.
Q:
GM part numbers for common replacement parts.A:
Part Number |
Description |
10105379 |
Stock 48mm throttle body gasket |
12524653 |
Intake manifold gasket set |
12552469 |
Exhaust manifold gasket set |
10168457 |
Stock .049" head gaskets |
12369145 |
Head Gasket Kit (includes intake/heads/exhaust/etc) |
10128293 |
Front cover (timing cover) gasket |
12552428 |
Front cover Optispark Seal |
10128316 |
Front cover crank seal |
12553792 |
Water pump drive seal |
10217886 |
Water pump bearing seal |
10128343 |
Water pump gasket (2) |
12527741 |
LT1 Water Pump |
10046089 |
Centerbolt Valve Cover Gasket |
12337972 |
EGR Valve Gasket |
10055726 |
EGR Tube Gasket |
10108676 |
Oil Pan Gasket |
12370835 |
LT4 Extreme Duty Roller Timing Set |
12555885 |
LT4 Roller Timing Set Cam Gear (95+ LT1) |
12555886 |
LT4 Roller Timing Set Crank Gear (95+ LT1) |
12555887 |
LT4 Roller Timing Set Roller Chain (95+ LT1) |
10128346 |
LT1 Link-Chain Timing Set Crank Sprocket |
10128485 |
LT1 Link-Chain Timing Set Link Chain |
10128349 |
93-94 LT1 Link-Chain Timing Set Cam Sprocket |
10126039 |
95+ LT1 Link-Chain Timing Set Cam Sprocket |
10457293 |
Optispark Cap & Rotor Kit (inc bolts/cover/o-rings) |
22146273 |
left motor mount (LT1) |
22146274 |
right motor mount (LT1) |
12555714 |
Rear main seal housing gasket |
17113086 |
Pressure regulator seal kit |
10115875 |
1LE AC delete pulley |
16188051 |
94-95 LT1 PCM |
16188309 |
Knock module - LT1 95 Impala SS |
16217700 |
Knock module - LT1 F-Body OBD-I |
16214661 |
Knock module - LT1 F-body OBD-II |
16214671 |
Knock module - LT1 Corvette |
16214681 |
Knock module - LT4 Corvette |
16214691 |
Knock module - LT1 Impala |
26026792 |
Pinion seal |
9785792 |
Pinion crush sleeve |
9783762 |
Pinion nut |
26029185 |
Series 3 Carrier ABS Reluctor (Speed sensor reluctor) |
9417784 |
Pinion bearing outer assembly |
22510042 |
Pinion bearing assembly-inner |
9420095 |
Carrier bearing assembly |
26016661 |
Differential cover gasket |
12345977 |
Mobil 1 75W-90 Synthetic Gear Lube GL-5 |
26039989 |
93-97 f-body stock driveshaft (steel 2.5"d wall 0.065"t 40.8"l 16 lbs) |
10085375 |
1LE 87-92 f-body driveshaft (aluminum 2.75"d wall 0.130"t 12.2 lbs) |
25008308 |
3.5" MAF sensor |
2503679 |
1 bar MAP sensor |
What is Dal's phone number?
A:
Van Devere Olds Co. 300 West Market St. Akron, Ohio 44303 |
800-362-9494 fax: 330-253-1370 |
Email: lockitup@bright.net |
What can I expect from a specific mod?
A:
Various mods give various results when combined with other mods. Sometimes the results are good, sometimes they are bad. Be extra careful with exhaust and intake mods as oversizing on either will result in a power loss. Below is a listing of some of the list members cars, and their results. Whenever possible, if the same car is tested under different mods, they are listed. While these are very informative, please realize that your results will probably be different depending on fuel pressure, environment, etc.Note - All tests below are taken at the rear-wheels unless otherwise stated. All tests are corrected using SAE standards. R Means that the car was re-tested again with a different setup. Car Owner R Year/Model Mods RWHP RWTQ ------------- ---------------------------------------------------------------------------------- Bruce Yey 1995 Z28 M6 Homemade Air Intake, 3'rd Gen Flowmaster Muffler, 276.7 317.2 HPP, 160 Degree Therm. Bruce Yey Y 1995 Z28 M6 Same as above, but added 1.6 Crane Gold Rockers 283.0 322.6 Steve Profio 1998 Z28 M6 Bone Stock 300.5 326.4 Jody Shapiro 1997 Z28 M6 Vortech 7# S/C, 160 Therm., Hypertech Blower Pgm 363.4 357.0 Borla Cat-Back (no plate) Jody Shapiro Y 1997 Z28 M6 Same as above, but with the middle Borla plate 348.5 344.7 David Fontaine 1998 Z28SS M6 Bone stock, no SLP Options, single outlet exhaust 300.0 316.9 Paul Britton 1997 Z28 A4 Bone stock 225.6 243.0 David Wilson 1996 Z28 M6 MTI Cold air, Air foil, MTI Underdrive pulley, 305.5 331.7 Ford SVO 24# Inj., SLP Flywheel, 1LE driveshaft, MSD6AL, NOS #5115,GMPP 1.6RR,Crane 10308-1 springs David Wilson 1996 Z28 M6 Same as above, but with NOS 407.3 549.2 Ehrich Koch 1996 T/A WS6 M6 Borla (1.75" plate), airfoil, Crane 99846 springs 292.0 320.0 1.6 Comp Cams Pro-Magnum Rockers Joshua Andrews 1995 Formula M6 Edelbrock Cat-Back,FIPK,Accel 300+,160 Therm., 298.8 260.8 AFPR (42 psi),HPP+ James Nance 1996 Z28 M6 K&N filter, 1LE intake elbow and driveshaft 258.5 301.4 Allen Woolley 1995 Z28 M6 Borla Cat-Back,AS&M Headers,3.73's, Accel Coil 283.0 318.0 1LE driveshaft,Crane HI6TR,Jacob wires, HPP+ and Custom Blower pgm,Random Cat. Allen Woolley Y 1995 Z28 M6 Same as above, but with Vortech 7# and Crane 1.6RR 396.8 391.2 Mike Graham 1995 Z28 A4 Decoma Cat-Back, !TB, !MAF and K&N Filter 269.2 315.3 Keith Lockliear Y 1996 T/A WS6 M6 Bone Stock 277.1 305.4 Keith Lockliear Y 1996 T/A WS6 M6 Same as above, but w/1LE driveshaft 278.2 310.4 Keith Lockliear Y 1996 T/A WS6 M6 Same as above, but w/Hypertech Underdrive Pulley 279.4 315.5 Keith Lockliear Y 1996 T/A WS6 M6 Same as above, but w/HPP+, 160 Thermostat 283.2 317.1 Keith Lockliear Y 1996 T/A WS6 M6 Complete setup : Borla cat-back, driveshaft,pulley 295.0 324.3 air-foil, HPP+, 160 Therm., Synthetic Transmission and rear-end fluid, Hypertech AFPR, !TB Coolant, Turbo Shops Power Loader II Program, K&N Filter