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Type: Posts; User: squared

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    ALDL PCM line length/noise

    I'm having problems with my MPVI having connectivity issues with the PCM in my boat and wondering if my ALDL-PCM wire is too long or if corrosion within the wire might be creating noise issues on the...
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    I agree. The product has been out long enough...

    I agree. The product has been out long enough now that it needs technical info that can be accessed in an online publication without having to weed through the forums. In military systems...
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    knock sensor Tip in

    I believe I understand what this term means, it's been a while since I've heard it but it's a slang term without a succinct definition. From my understanding of the term 40+ years ago, "tip in"...
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    effect of no VSS signal

    What is the impact of not having/using VSS on PCM operation? I see that it's a flag for idle zone entry, but does it effect fuel/spark calculations above idle speed? For example during steady state...
  5. Thanks, good catch. Makes sense, by all visual...

    Thanks, good catch. Makes sense, by all visual indications, it's running incredibly rich during that period and that's why the air mass reading is over the top. Cleared a MAF code, PCM takes it as...
  6. start-won't idle after clearing codes and tune upload

    2001 4.8l, running stock tune except for PE at 45% throttle. When I clear codes, upload another tune to the PCM or reset power, the engine won't idle. It starts when in the start position, but once...
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    brake switch and case relearn

    My installation doesn't use the brake input to the PCM (it's a boat). Since the circuit is 'open' when the brake is depressed in normal automotive applications, is it correct to assume that I can...
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    Did not know that, thanks. After looking at the...

    Did not know that, thanks. After looking at the editor notes, I see that on MAF fail that knock learn is set to the low octane table. That explains why during my wideband tuning since MAF is...
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    knock retard shows zero

    Scanner shows no knock retard during my tuning, but I have verified it is using the low octane table. It's an engineering prototype (my wife believes it's a boat), and I can hear the engine knocking...
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    I'm having the same issue with mine. It's...

    I'm having the same issue with mine. It's reducing the advance, but knock retard shows 0 in the channels the graph and the chart.
  11. I thought, wow look at that thread...49 posts. ...

    I thought, wow look at that thread...49 posts. Must be some great advice there based on the original question...but
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    And the answer is.... Red connector, pin 14,...

    And the answer is....

    Red connector, pin 14, which is the same pin on a Camaro which has a pressure sensor.

    Help urself
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    0411 PCM a/c pressure pin

    I'm hooking up a wideband to the A/C pressure pin on my 0411 PCM. The schematics for a 2001 silverado shows two A/C pressure inputs, one on red 55, the other on red 17. I've set up the scanner to...
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    Yep..you were right...O2 sensors cross-wired. ...

    Yep..you were right...O2 sensors cross-wired. Bank 1 O2 reading bank 2 and Bank 2 O2 reading bank 1. I figured that was the problem..guess I should have checked it. My engine came with the PCM...
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    inconsistent and erratic idle

    I'm stumped.. Bad IAC? Case learn? Checked for vacuum leaks with carb spray and there appear to be none.
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    Online Help Relevant

    The online help page seems to address version 2 and the date on the web page says 2013. The product is now at version 3.6. Is the help section still relevant and is there a plan to update the...
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    4.8 in boat poor idle, won't rev

    Initial installation, trying to get it running correctly. Engine starts with high idle, eventually drops after going into closed loop. The idle is steady until you tweak the throttle, then it goes...
  18. Here are a couple from my manual 2000 coupe that...

    Here are a couple from my manual 2000 coupe that I did last year when I was trying to diagnose a problem, it's stock. "good" is somewhat relevant as it was running like crap most the time.
    ...
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    That's a bit rediculous...

    That's a bit rediculous...
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