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10-17-2013, 11:20 PM
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#1 |
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Registered User
Join Date: Aug 2007
Location: Bakersfield, Ca
Posts: 538
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dilema
I recently had a 2008 5.3 installed in my 67 (never mind the engine cover). The original computer had some pins bent and looked a little rough (junk yard hacks).
So I bought a new one (also needed new trans module). Took it to the tuner and it runs good (300hp at wheels). But it has an error because the crankshaft sensor is not calibrated. The tuner said he couldn't do it and to take it to a dealer. The dealer said he couldn't get it to learn due to errors etc.. Went back to tuner and he still believes they can "force" it to learn. And perhaps that dealership guy doesn't know that. Any ideas? Furthermore, I straightened the pins on my original computer, we hooked it up and downloaded tune. No problem with crankshaft sensor but I have a high idle situation. Read it might have to relearn and can take 150-200 miles. On both ECUs, the transmission shifts hard from 1st to 2nd. Any recommendations (not a lot of tuners around here). Last edited by Mondo; 10-17-2013 at 11:25 PM. |
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10-18-2013, 12:19 AM
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#2 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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Re: dilema
Your tuner is right about the crank sensor. It's a crankshaft position sensor relearn that needs to be done, very easy to do with the GM scan tool so I'm not sure why the dealer couldn't figure it out. I know you can do it with most of the newer Snap-On scan tools too.
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
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10-18-2013, 12:30 AM
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#3 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: dilema
Tell your "tuner" its in the Bi-Di section and he should be able to do a crank relearn from there. The same should do for EFI live as well.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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10-18-2013, 05:31 PM
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#4 |
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Registered User
Join Date: Aug 2007
Location: Bakersfield, Ca
Posts: 538
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Re: dilema
Should of been a bit clearer.... the tuner's program can't "force" it to re-learn the crank position. On a regular truck, with all it's smog, sensors etc... he can do it.
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10-18-2013, 05:58 PM
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#5 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: dilema
What is he using to tune your motor? I kinda feel like he's lying.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING |
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10-19-2013, 12:21 AM
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#6 |
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Registered User
Join Date: Aug 2007
Location: Bakersfield, Ca
Posts: 538
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Re: dilema
That I don't know... he's pretty reputable, tons of business along with some expensive rides. Looks to be an american V8 specialist; didn't see any riceburners around (I say that with affection as I have one of those too).
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10-19-2013, 12:55 PM
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#7 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: dilema
Open VCM scan, turn logging off, the CASE relearn box shouldn't be greyed out anymore, and a relearn shouldn't be an issue.
If your cammed and it can't do the relearn due to tps, you can force the TPS percentage below 20% and it should avoid TPS TOO HIGH errors causing failed relearn. Make sure there aren't ANY store DTC, and that you arent' getting a p1336 or 1331 codes. ANY remaining random other emissions stuff causing codes will prevent a relearn also, as it will fail something on the "ready" checklist. HP Tuners should have the capability to do CASE relearns since like 2005/6. Engine must be WARM (over 160*-ish) CASE CASE Learn: To use the CASE learn function please follow these steps: Ensure the engine is at normal operating temperature (ECT > ~65C). Put the vehicle into park (auto) or neutral (manual). Turn off all accessories and A/C. Turn the vehicle off. Apply the parking brake. Press the brake pedal. Keep the brake pedal depressed during the entire procedure. REQUIRED for successful test completion Start the vehicle and let it idle. Press Begin. Gradually rev the vehicle to fuel cutoff (around 4000-5000 RPM's) over a period of about 4 seconds. When fuel cuts out, immediately release the throttle. Allow the engine to come back to an idle. Turn the ignition off for at least 15 seconds. This step is required for the VCM to store the newly learned configuration.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING Last edited by BR3W CITY; 10-19-2013 at 01:03 PM. |
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10-20-2013, 02:35 PM
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#8 |
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Registered User
Join Date: Aug 2007
Location: Bakersfield, Ca
Posts: 538
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Re: dilema
The guy at the Chevy dealership said something about not getting a brake signal. The only modern pedal I installed was the throttle. Do I need to install some kind of brake switch?
I don't have any emissions on the truck either (just the O2 sensors after the headers). so can we get around the "ready" checklist? Appreciate the help BR PS- had to go back to the new computer as the original started acting up... high idle still continued and started dropping a cylinder (funny, the transmission would shift normally when the cylinder cut out). Anyway, I'm sure it's do to those pins that were bent. So I really need to solve this relearn issue. Last edited by Mondo; 10-20-2013 at 02:41 PM. |
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10-20-2013, 03:55 PM
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#9 |
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Registered User
Join Date: Apr 2009
Location: Waynesfield Ohio
Posts: 1,991
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Re: dilema
You need a 12 volt signal going back to the ECM when the brakes are not applied. This should hook up to a two position brake switch and once you hit the brake pedal it will stop the signal. The switch you need should be from a 84 with cruise.
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