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 PCM calibration

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mp775

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Posts : 746
Join date : 2011-08-24
Age : 38
Location : Pawtucket, RI / Woburn, MA

PostSubject: PCM calibration   Tue Nov 01, 2011 12:38 pm

I was looking up PCM calibration history on http://tis2web.service.gm.com and I noticed there have been five factory recalibrations, including "fix for clunk when shifting gears." I have a clunk, and if it's just a matter of programming I'd love to fix it. Has anyone installed one of these, for lack of a better term, factory service packs? Is it something that can be done with the PCMperformace software, or will I have to go to a dealer for the program?
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sdstick

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Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: PCM calibration   Tue Nov 01, 2011 1:50 pm

Its not the 1-2 (@ 11MPH) one is it?

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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mp775

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PostSubject: Re: PCM calibration   Tue Nov 01, 2011 4:58 pm

Sounds about right. Lemme guess, it's about to blow...
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sdstick

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PostSubject: Re: PCM calibration   Tue Nov 01, 2011 5:03 pm

WRONG.....
It'll do that forever with no problems.
I'm not sure the programmers go after that (unless you specifically tell them)
It's a light throttle right at that speed thing
Dont worry about it unless it REALLY bugs you

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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mp775

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Location : Pawtucket, RI / Woburn, MA

PostSubject: Re: PCM calibration   Tue Nov 01, 2011 5:08 pm

*whew*. It's still an annoyance, though. Nothing I would bother tearing the transmission apart to fix, but if a factory software update makes it go away I'll do it.
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V8Killer

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Location : Southern, NH

PostSubject: Re: PCM calibration   Tue Nov 01, 2011 6:26 pm

mp775 wrote:
*whew*. It's still an annoyance, though. Nothing I would bother tearing the transmission apart to fix, but if a factory software update makes it go away I'll do it.

IMO, i would leave it alone. I makes the clunk go away by lowering line pressure and shift solenoid timing, which will make the trans much easier to burn up the 2-4 band or clutches. Mad
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PostSubject: Re: PCM calibration   Tue Nov 01, 2011 6:26 pm

It is annoying. Every b-body with a LT1/4l60e I have owned or driven has done it. They all clunk going into second gear at slow speed.
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mp775

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Location : Pawtucket, RI / Woburn, MA

PostSubject: Re: PCM calibration   Tue Nov 01, 2011 10:31 pm

V8Killer wrote:
I makes the clunk go away by lowering line pressure and shift solenoid timing, which will make the trans much easier to burn up the 2-4 band or clutches. Mad

Awesome.
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mega

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Location : Hyannis, ma

PostSubject: Re: PCM calibration   Wed Nov 02, 2011 6:27 am

This is what i got for mine. Should I go to dealer and have them do these for me?


Part Number Cal.ID# CVN Description
16230191 16230033 N/A Corrects chuggle and surge, also corrects intermittent code 32, Bulletin number 576517.
16230032 N/A
16214741 16214567 N/A Supercession to correct odometer display, Bulletin number 476511.
16214566 N/A
16210351 16210127 N/A Calibration change to enhance performance
16210126 N/A
16203021 16203008 N/A Running change to fix 3-2 downshift flare, Bulletin number 377150.
16203007 N/A
16199871 16199793 N/A Control module calibration
16199792 N/A
Selected Options:
VIN: 1G1BL52W0RR125693
Controller: PCM/VCM Powertrain/Vehicle Control Module
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sdstick

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Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: PCM calibration   Wed Nov 02, 2011 10:15 am

mega wrote:
Should I go to dealer and have them do these for me?


toomanytoyz wrote:
No.

V8Killer wrote:


No

.....................No

IMPALADAKID wrote:


http://pcmperformance.com/

Change VIN

=Disable VATS

=Change RPM or speed limiters

=Speedometer recalibration for axle ratio or tire changes

=POWER TUNE = spark timing and fuel remapped for more hp/torque

=ECONOMY TUNE = improved mpg

=High or low octane programming

=Lower fan turn-on temp settings

=Remap shift patterns for performance or towing

=Remap shift pressures for firmer shifts

=Modify TCC lockup speeds for performance or towing

=Delete emission functions and codes (EGR, AIR pump, EVAP, O2s, etc.)

=Program for MAFless operation = speed density mode

=Delete various nuisances (SKIP SHIFT, traction control ,etc.)

Delete other miscellaneous functions and trouble codes (A/C, oil level, etc.)

Things marked = at the begining, are ones that you can do to a stock motor without any real mods.


Or there are some on here that can tune as well.

Bill M gives you some things that you may / do want to change

Very few here support bringing your car to the dealership
I dont think ANY would support dealer tuning.
Ask more questions.

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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mp775

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Location : Pawtucket, RI / Woburn, MA

PostSubject: Re: PCM calibration   Wed Nov 02, 2011 2:42 pm

Thanks; this is exactly the feedback I was looking for.
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fatvet

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Location : Suffield, CT

PostSubject: Re: PCM calibration   Thu Nov 03, 2011 12:42 pm

Us nutmeggers call it the parking lot clunk.....

ever try to drive around a parking lot or garage....you get a little straight-away
and it clunks into 2nd as you slow for the turn.
Fun is.... geek

learn to live with the fact these cars are AWESOME, not perfect... Or everyone would have bought one.

-ALF out....
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mp775

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Join date : 2011-08-24
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Location : Pawtucket, RI / Woburn, MA

PostSubject: Re: PCM calibration   Thu Nov 03, 2011 2:35 pm

fatvet wrote:
ever try to drive around a parking lot or garage....you get a little straight-away
and it clunks into 2nd as you slow for the turn.

Yup -- and 30 miles each way on Route 128 every day too Mad

Quote :
learn to live with the fact these cars are AWESOME, not perfect... Or everyone would have bought one.

Absolutely. I can live with it as long as it's supposed to do that Smile.
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Matt Trakker

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Age : 35
Location : Reading, MA

PostSubject: Re: PCM calibration   Thu Nov 03, 2011 3:36 pm

My TBI car seems to do this too. And I have new u-joints as well. I don't know what the hell it is.
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V8Killer

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Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: PCM calibration   Thu Nov 03, 2011 5:13 pm

Matt Trakker wrote:
My TBI car seems to do this too. And I have new u-joints as well. I don't know what the hell it is.

Normal condition, worse in 4WD configurations. Newer 4L65's still do it. Try a B&M shift-kit Surprised , it makes that 100 times WORSE Shocked
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Tomz9C1

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Age : 54
Location : Rumford, Maine

PostSubject: Re: PCM calibration   Fri Nov 04, 2011 9:38 pm

My Suburban does it. My 94 9C1 does it. My B4U does it. My L99 does it. My 95 9C1 used to do it. And sooner or later, Joy's 02 Safari going to do it. I'm seeing a pattern here.
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Matt Trakker

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Location : Reading, MA

PostSubject: Re: PCM calibration   Fri Nov 04, 2011 10:16 pm

My '93 Blazer with the 4l60e didn't do it, or maybe it did and I didn't notice it because of all the other little things it did. haha
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