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PCM tune ?

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Old May 29, 2013 | 05:53 PM
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Default PCM tune ?
Did a full rebuild and did a cam install and other supporting mods. When I did a first start. I got the " reduced engine power " message. Ppl said a tune would fix that
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Old May 29, 2013 | 06:54 PM
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What kind of vehicle?
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Old May 29, 2013 | 06:55 PM
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What do you mean when you did a first start? just starting the engine up gave you the message? Yes, a tune is needed to prevent going into reduced power mode, but it shouldn't come in just starting it up...
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Old May 29, 2013 | 08:50 PM
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Originally Posted by LSX Power Tuning
What kind of vehicle?
Gmc yukon 2wd 5.3
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Old May 29, 2013 | 08:55 PM
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Originally Posted by BLK02WS6
What do you mean when you did a first start? just starting the engine up gave you the message? Yes, a tune is needed to prevent going into reduced power mode, but it shouldn't come in just starting it up...
I started the vehicle for the first after the rebuild. It said in my message center reduced engine power.. And I won't even idle at all. Can't even get the rpms up past 2 grand I have video I can post
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Old May 29, 2013 | 10:40 PM
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I agree, a tune is needed but the reduced engine power shouldn't happen at idle. Double check and make sure you got everything plugged back in, maf, tb, map, etc..
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Old May 30, 2013 | 12:17 AM
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I just remember I don't have the maf on my cold air intake
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Old May 30, 2013 | 07:33 PM
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Your IAT sensor is in there, you kinda need that...
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Old May 30, 2013 | 09:53 PM
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I got the MAF on. Started the engine no reduced engine powe light but once the motor warmed up reduced engine light came on it it idled at 500rpms and stayed after mild revs
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Old May 31, 2013 | 04:56 PM
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Are you sure everything else is plugged back in? Did you change the injectors, or are they stock?
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Old May 31, 2013 | 05:09 PM
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Everything is plugged back in! Injectors are stock Flex fuel injectors
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Old May 31, 2013 | 08:00 PM
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You are going to have to get a scanner on it to find out - hard to diagnose something like this over the internet... you got a weird one...
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Old Jun 4, 2013 | 01:05 PM
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I got the code

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Old Jun 4, 2013 | 02:29 PM
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Have you messed with the TB or idle set screw?
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Old Jun 4, 2013 | 03:13 PM
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I have an electric tb
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Old Jun 4, 2013 | 04:26 PM
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Sounds like the pcm is trying to make it idle setting off the IAC code. I just looked through a few random DBW 5.3's I tuned and all of them still had P0507 settings left stock. I havent had that code pop up before but I also never tried running one untuned.
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Old Jun 4, 2013 | 04:55 PM
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So basically once I get a tune? This issue will be fixed or should I get another IAC
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Old Jun 4, 2013 | 07:41 PM
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From: on the dyno tuning in MD
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DBW doesn't have an IAC - it opens the blade vice haveing an IAC motor... that is a generic diagnostic readout. I would say a tune to get it to idle properly should get rid of your issue. Like LSX power tuning said, I've never even started one up with a cam and no tuning - I always do a base tune to get started - so I can't say I've ever seen this exact problem...
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Old Jun 4, 2013 | 08:26 PM
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Ok so will the tune get rid of my reduced engine power light
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Old Jun 4, 2013 | 10:08 PM
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Originally Posted by gmcyukon
Ok so will the tune get rid of my reduced engine power light

Best guess is yes, but without any kind of data log or anything to go off no one can guarantee that a tune will fix it.
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