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hello. i have 1986 s10 that recently had a lq4 with a powerglide. i swapped out the powerglide to a 4l80e and did a Manuel valve body to the trans. also swapped out the headers with mid lengths. the engine is stock except for the 243 heads. the pcm is from the same van that i got the engine from. im using hp tuners and the main thing i touched was vats, egr, rear o2, and maf delete ( im going speed density) and deleted all the tranny codes. i did all this when i had the powerglide and now when i swapped in the 4l80e ( which i dont think should do ****) the idle hangs too 2500 and wont come down. the pcm is tuned right now for VE open loop
the things i tested
iac is brand new from ac delco
tps is .5v at 0% and 4.56 at wot
smoke tested the intake with rockers loosened no leak.
new manifold gasket
got another pcm from a 6.0l DBC bought the points for the pcm and still nothing 4
compression tested 170 +- all cylinders
truck is grounded correctly
also for some reason my iac counts shoot down to zero form what the scanner is telling me
Please help me thank you
Please help because i have no freaking idea what too do next
Last edited by GmInfectedfox; Oct 13, 2021 at 07:02 PM.
With the old Powerglide, did you have 4L80E chosen in the drop down menu of the Transmission table like it is now?
(Screenshot below is from the tune you posted)
I thought that if you used a manual valve body, instead of re-wiring to go through the ECU, you should choose either MANUAL, or NON-ELEC AUTO? Easy enough, and free, to try...
I have a 4L80E in my car, and it is wired through the ECU, BUT...if/when I start it (drifting down through the staging lanes) and car is in NEUTRAL, the idle is up to about 2000rpm, until I either stop, or put it in gear.
Maybe yours is doing something similar? Because you have "told it" that you have a 4L80E, but don't use the ECU? Maybe somehow it thinks it's moving or whatever...
[QUOTE=rel3rd;20386347]With the old Powerglide, did you have 4L80E chosen in the drop down menu of the Transmission table like it is now?
(Screenshot below is from the tune you posted)
I thought that if you used a manual valve body, instead of re-wiring to go through the ECU, you should choose either MANUAL, or NON-ELEC AUTO? Easy enough, and free, to try...
I have a 4L80E in my car, and it is wired through the ECU, BUT...if/when I start it (drifting down through the staging lanes) and car is in NEUTRAL, the idle is up to about 2000rpm, until I either stop, or put it in gear.
Maybe yours is doing something similar? Because you have "told it" that you have a 4L80E, but don't use the ECU?
.
when i had the pg it was Manuel also. and ive been told from the guys from hp tuners that just delete all the tranny codes. and dont bother with the drop box. thank you for showing interest. im at a loss i have no idea what ive done lol
when i had the pg it was Manuel also. and ive been told from the guys from hp tuners that just delete all the tranny codes. and dont bother with the drop box. thank you for showing interest. im at a loss i have no idea what ive done lol
If that's how it was, I'd definitely click onto the MANUAL option again, and reflash...
I've honestly never looked into what makes mine do it, and since I know "when" it does it, I have kinda "fixed" mine, lol.
Enough so that it doesn't bother me, anyway...Hopefully, yours is just that easy of a fix, with a couple mouse clicks.
If that's how it was, I'd definitely click onto the MANUAL option again, and reflash...
I've honestly never looked into what makes mine do it, and since I know "when" it does it, I have kinda "fixed" mine, lol.
Enough so that it doesn't bother me, anyway...Hopefully, yours is just that easy of a fix, with a couple mouse clicks.
crap sorry sir i meant to say the powerglide was also manuel valve body with the 4l80e checked off in the box also
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high idle lq4 
