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New pcm question?!?

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Old 12-25-2006, 10:59 AM
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Default New pcm question?!?

I just got a pcm from wait4me and in the instructions its say the SES light will come on and that a crank position relearn will have to be performed. What is this? Does autozone or somewhere like that have a scan tool that can do this? Will my car run bad before I get it done after the pcm install? Would it be ok to drive it somewhere to get this done after the pcm install?
Old 12-25-2006, 11:28 AM
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Hi, It wont Run bad, It just sets up the pcm to detect miss fires correctly and other internal calculations in the pcm. We dont have a distributor on the engine so we cant set up for 4 deg base. That is why i force the data to flush and then it starts over. It can be done with anyone that has a good scan tool. It takes less than 2 minutes total. Thanks
Old 12-25-2006, 11:31 AM
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Thanks, I'm really trying to find a place that can do it though. Can anybody tell me if autozone or a similar place has a scan tool that can do this?
Old 12-25-2006, 11:33 AM
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Tranny shops, Freinds, Dealers, Just about ANY speed shop, Car repair place ect... They can all do it, But not Autozone. The scanner they use is generic.
Old 12-25-2006, 06:29 PM
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The dealership can do this for sure?
Old 12-25-2006, 06:49 PM
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The stealership or anyone with EFILive or HP Tuners can do it.

Don't you just set the scan tool up and rev to 4K as long as the ECT is nominal?
Old 12-25-2006, 06:49 PM
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Yes a dealership can "do" it with their TechII tool but they will probably charge you an hour of labor since it is not a very common request. Maybe you could talk them into helping you out, like "Hey come on, how much money do I spend on GM parts a year here?" Where are you located in OK? Maybe someone local to you could pipe up. If you were in NE Florida I'd do it for free.
Old 12-25-2006, 06:52 PM
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I can do it for free. Where in OK are you?
Old 12-25-2006, 07:50 PM
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I just installed the pcm and the SES light didn't come on??? Whats with this? the dealership sponsors my race car so they shouldn't charge me to much.
Old 12-26-2006, 05:34 PM
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I went to the dealership and they guy told me it was going to be 1 hour so $75. I was like aer you kidding me. It will take you 3 minutes. I got him to just charge $36 which is still to much but better than $75. I went to a performance shop and he want $36 as well so I guess the dealership is that high.
Old 12-27-2006, 01:04 AM
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Crank Relearn is done at high RPM fuel cut out. This gives the engine stability at high RPM, without spark or fuel variables involved. The actual procedure only takes a few seconds as once cut out is reached the procedure is immediately stopped to prevent overrevving. This is done with a scan tool that has Bidirectional Controls which Autozone doesn't have.
Old 12-27-2006, 08:41 AM
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Technically, It measures the angles on accelleration AND decelleration. That is why you need to hit the higher rpm and then it shuts off fuel so it can see both.




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