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#76 |
Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: 4l80e shifting ?
have you traced all the pins/wires end to end? I only ask as maybe there is a break/disconnect somewhere in the wiring?
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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#77 |
Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: 4l80e shifting ?
that's my next move I guess...
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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#78 |
Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: 4l80e shifting ?
maybe this is the problem....
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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#79 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 4l80e shifting ?
His instant message should have read
"Tune is correct as I have checked it, but clearly I just stepped on my d!ck as I didn't make the harness right".
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING ![]() |
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#80 |
Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: 4l80e shifting ?
fixed now I hope....
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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#81 |
Registered User
Join Date: Jul 2013
Location: Austin, Texas
Posts: 349
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Re: 4l80e shifting ?
I have a PSI harness as well, with a freshly built 4l80 and Circle D converter. Thought my ISS was bad as I'm getting p0171 as well. Now I'm going to double check and make sure these goons pinned the harness correctly.
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#82 |
Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: 4l80e shifting ?
I've got two harness' and pcm's from PSI and both times they've been f**ked up! my 6.0l/4l80e was pinned wrong and my 5.3/700r4 pcm was tuned for a 4.3 v6! ...never again.
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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#83 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 4l80e shifting ?
Very common issue with PSI, Didn't know that when Mooseknuckles started this thread 4 years ago.
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