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  1. Replies
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    16,803

    Not really a matter of whether it's OBD-1 or...

    Not really a matter of whether it's OBD-1 or OBD-2. They both function to eliminate detonation (knock) and prevent engine damage. If you are not running the KS, your tune has to account for that. ...
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    Now we know why only the F-Body doesn’t have a...

    Now we know why only the F-Body doesn’t have a dual KS. They couldn’t figure out how to make it fit either.....

    I don’t run a KS. Don’t play well with a solid roller camshaft.
  3. Thread: INJUNEER

    by Injuneer
    Replies
    6
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    121

    Thank you very much. Greatly appreciated! I'm...

    Thank you very much. Greatly appreciated!

    I'm old, retired, and have a lot of time on my hands :) . My Formula is going to be up for sale.... I haven't driven it in 5 years. And since they...
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    I know how that works :D ..... old age is a...

    I know how that works :D ..... old age is a bitch.

    Maybe you were thinking about the port right above the oil filter. But that’s exposed to oil and used for the oil pressure sensor on 93’s and...
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    The F-Body KS uses the block drain port,...

    The F-Body KS uses the block drain port, passenger side. There is another block drain in the same place on the driver side. The Corvette LT1 has dual knock sensors, one KS on each side in those...
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    125

    Forgot to add..... if the problem is between the...

    Forgot to add..... if the problem is between the VSS and the PCM, you would have DTC 24.
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    Just curious.... have I given you the link to the...

    Just curious.... have I given you the link to the free download of the 1994 factory service manual? With that, you can look the codes up and not have to rely on random questionable info from the...
  8. Thread: Haggard-hawk

    by Injuneer
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    826

    Good find. The "Y87 3800 Performance Package"...

    Good find.

    The "Y87 3800 Performance Package" for the V6 cars, introduced in 1996, included the 3.42 posi (auto trans), 14.4:1 steering, 4W discs, dual outlet exhaust, and 235/55-16 tires.
  9. Thread: Vss question

    by Injuneer
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    2
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    100

    In Scan9495 log, what readings appear in the VSS...

    In Scan9495 log, what readings appear in the VSS field (column M)? Are they always "0"?

    There is DTC 24 - Vehicle Speed Sensor Circuit

    In order for the code to set:
    - Trans output speed less...
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    For future reference: Courtesy of Shoebox ...

    For future reference:

    Courtesy of Shoebox

    http://shbox.com/1/harness.htm

    http://shbox.com/1/95-97_hoses.jpg

    http://shbox.com/1/heater_hoses.jpg
  11. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    Thanks for the positive feedback. Funny thing...

    Thanks for the positive feedback. Funny thing is, these issues are seldom the same, and every time I work on a new problem, like this one, I learn something new - win-win situation. In this case it...
  12. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    At this point, it's beyond my ability to resolve....

    At this point, it's beyond my ability to resolve. If you want to run a Scan9495 log showing the startup attempt, in .csv format, I'll see if there is anything in there that points to the problem.
  13. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    You keep mentioning the “pulse” and “spike” on...

    You keep mentioning the “pulse” and “spike” on the white wire. Have you ever actually measured the AC voltage with the engine cranking, as recommended several times?
  14. Thread: Pcm ground

    by Injuneer
    Replies
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    1,374

    He already swapped out the coil. But maybe the...

    He already swapped out the coil. But maybe the new one is defective.

    Can't remember if I already posted this:

    http://shbox.com/1/coil_testing.jpg
  15. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    Still not clear in my mind.... guess old age is...

    Still not clear in my mind.... guess old age is taking it's toll. When you had the Opti off, and spun it, you got the 5V DC pulse at the Opti harness, and injectors pulsed. The proves the Opti is...
  16. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    Are you saying that when you reinstalled the...

    Are you saying that when you reinstalled the Opti, and tested for AC voltage on the white wire to pin B, there was no reading?

    If the ICM is not getting that signal on the white wire to fire the...
  17. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    Did you measure the AC voltage on the white wire...

    Did you measure the AC voltage on the white wire to pin B of the ICM connector, as suggested in previous post?
  18. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    Turn it SLOWLY. The low res circuit will produce...

    Turn it SLOWLY. The low res circuit will produce 8 pulse for one revolution of the Opti. There are 4 varying space longer pulses, alternating with 4 short pulses. The high res circuit produces...
  19. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    You will have to run a ground wire from the Opti...

    You will have to run a ground wire from the Opti case to the block.
  20. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    Shoebox’s procedure emphasizes the D pin...

    Shoebox’s procedure emphasizes the D pin resistance is measured key OFF.

    Follow up with the measurements at the ICM. The 1-4 volts AC on the white wire (pin B) is the key to determining if the...
  21. Thread: Pcm ground

    by Injuneer
    Replies
    55
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    1,374

    If you have a STOCK setup, when you put the key...

    If you have a STOCK setup, when you put the key in the lock cylinder, and they key has the correct resistance, the theft deterrent module (TDM) passes 12 volts to the starter relay (TDR) so the...
  22. Thread: Pcm ground

    by Injuneer
    Replies
    55
    Views
    1,374

    If it cranks the engine when you turn the key to...

    If it cranks the engine when you turn the key to “start” it’s done right.
  23. Thread: Pcm ground

    by Injuneer
    Replies
    55
    Views
    1,374

    Ask Moe to confirm he deleted it. But if the PCM...

    Ask Moe to confirm he deleted it. But if the PCM isn’t setting DTC 46 and you don’t have a TDM in the circuit, it sounds like it's been programmed out. How did you address the other part of the...
  24. Thread: Pcm ground

    by Injuneer
    Replies
    55
    Views
    1,374

    The 94/95 F-Body LT1 control does not have the...

    The 94/95 F-Body LT1 control does not have the low oil pressure interlock. The Corvette LT1 does.

    What is the VATS issue? The PCM is looking for a 60Hz signal from the theft deterrent module...
  25. Thread: Pcm ground

    by Injuneer
    Replies
    55
    Views
    1,374

    The PCM has 4 ground terminals. Two of them (A2,...

    The PCM has 4 ground terminals. Two of them (A2, C32) have black/white wires that connect to the same large splice, where it joins grounds from:
    - oil level sensor
    - MAF sensor
    - a single wire...
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