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Type: Posts; User: Joshie225

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  1. Replies
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    Thanks for the spreadsheet. Indeed there is much...

    Thanks for the spreadsheet. Indeed there is much more dwell variation with voltage than with temperature.

    Expressing not understanding isn't complaining. I better understand now. And with the...
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    You've coded an ignition system that is far more...

    You've coded an ignition system that is far more complex than I thought necessary. The coil needs a certain amount of time to charge fully. If the voltage is low it needs more time. If the MAP is low...
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    Hmm. How can I say this nicely? ...I can't so......

    Hmm. How can I say this nicely? ...I can't so...

    What I'm interested in knowing is what went wrong.
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    I'm sorry. How did the wheels come off? I'm not...

    I'm sorry. How did the wheels come off? I'm not understanding what's happening.

    I'd like to be one of the people with a running setup, but the world as it is gives me scant opportunity to use the...
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    The coils GM uses for coil-per-cylinder ignition...

    The coils GM uses for coil-per-cylinder ignition have dwell limiting built in so there's a hard ceiling on primary current to keep the coil and switching unit from burning up. Adding in coil current...
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    I brought up wearing of the spark gaps due to the...

    I brought up wearing of the spark gaps due to the distributor-equipped Express Van that have, as ku4ro found, "...map reference for the coil." That code could be there for long-term durability....
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    Forgive me butting in. I know nothing about code,...

    Forgive me butting in. I know nothing about code, but I do about electrical theory and the dielectric strength of gasses. Lowering the ignition output is of course possible at lower cylinder...
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    The dealer couldn't help. They also didn't have a...

    The dealer couldn't help. They also didn't have a Tech 1 or Tech 2, but something newer. The tech couldn't find any changeable options in the CCM, but was able to read the VIN and it matches. I...
  9. MAF screen is intact. I was thinking about...

    MAF screen is intact.

    I was thinking about fuel pressure and checked the vacuum line to the regulator. But if the pressure were high at low load the PCM would have to pull fuel then rather than...
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    This meets my expectations. I have an appointment...

    This meets my expectations. I have an appointment tomorrow at the local Chevy dealer and they have a Tech 2. Hopefully they also have the correct adapter for the 16-pin OBD 1.
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    I'd read that thread before. All I need to change...

    I'd read that thread before. All I need to change is the engine type so that CCM code 81 goes away and takes the "SYS" message with it. There is nothing else wrong so the CCM does not need tobe...
  12. Understood. I won't mess with the VE tables while...

    Understood. I won't mess with the VE tables while in the stock configuration.

    Vacuum leaks are much more influential under light load and the fuel trims are fine there. I've had the MAF sensor...
  13. This is interesting. Does this mean that if I...

    This is interesting. Does this mean that if I want the speed density tables to be accurate that I need to disable the MAF before tuning?
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    Here's the situation... The CCM was recently...

    Here's the situation...

    The CCM was recently replaced, but before I bought the car the end of March. The dash displays the "SYS" message indicating a current-DTC malfunction. In CCM Diagnostic...
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    Wanted: Tech 1A

    My 1994 Corvette needs CCM reprogramming. Does anyone have a Tech 1A for sale or rent? EBay only has adapters at the moment.

    Thanks,
    Josh
  16. Dave W, Thanks for chiming in! I ran the...

    Dave W,

    Thanks for chiming in! I ran the EEHack analysis myself which is how I knew the PCM was adding as much as 17% extra fuel. I was wondering if this is common on MAF equipped cars on E10 fuel...
  17. I wanted to bump this and ask specifically; Why...

    I wanted to bump this and ask specifically; Why are my trims are so out of whack? It looks like it PCM is compensating for a lean condition at anything above light load. I don't need the exact...
  18. My CCM appears to function well except when...

    My CCM appears to function well except when communicating with the PCM in diagnostic mode, and perhaps at other times, leading to the persistent "SYS" message. I had forgotten about the CCM code 81,...
  19. From what I can tell the car is 100% stock other...

    From what I can tell the car is 100% stock other than a K&N drop-in air filter that came with the car. The wideband is not yet installed. When I get the car on a lift to change the O2 sensors I'll...
  20. Newbie's 1st Log 1994 LT1 Corvette, Can you have a look?

    I got my SparkFun FTDI breakout to 16-pin ALDL cable assembled last night and was soon communicating with my 1994 Corvette. Today I took it for my first ever data logging drive.

    The log begins...
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    The adapter cable I made failed to work so I got...

    The adapter cable I made failed to work so I got my hands on the SparkFun FTDI breakout and now I'm talking with EEHack. It's odd. The only stored code in the main window was for low coolant temp,...
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    Sounds good! I'll start poking around in the...

    Sounds good! I'll start poking around in the software while my ALDL connector is on the way. If I get impatient I'll just insert bare pins and see if she talks.
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    Thanks Steveo! I've downloaded EEHack and...

    Thanks Steveo!

    I've downloaded EEHack and TunerProRT, but haven't yet installed them. I have a fair bit of reading to do while I wait for my cable parts to arrive. Can you say more about the...
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    1994 Corvette Owner in Vancouver, WA

    Hello! I'm here as I bought a '94 Corvette recently and I intend to do some PCM tuning and trouble shooting. My car is a 6-speed so I intend to disable the skip-shift and read the DTCs which my CCM...
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