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Just finished swap... engine won't rev

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Old Oct 27, 2014 | 02:03 PM
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Default Just finished swap... engine won't rev

I am just finishing a 5.3 vortec into a 1982 C10 truck swap. I used a chevy thunder wiring harness and tune. It is supposed to be in manual mode due to the trans in the truck is a TH375.

It cranks right up and idles like a champ but won't rev past 1500 RPM's.

I reset the PCM and I ran it (as instructed in his DVD material) 5 minutes cut it off wait 30 seconds fired it up. I have done this multiple times... it will not rev. It's like the MAF is disconnected. It is showing 48+ psi fuel pressure at idle and when I try to rev it, it goes up to 60. All connectors are plugged in. I pulled the MAF off my daily and installed it....same thing...won't rev. No codes at all.

I have no idea if abuse mode is in this PCM and have no way of finding out as all I have is a scanner currently. Any ideas as to a way to bypass the abuse mode if that's the problem. I am located in central Va. and do not know LS tuners. Thanks for any help.

Last edited by The stunningman; Oct 27, 2014 at 06:36 PM.
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Old Oct 28, 2014 | 10:15 AM
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What year 5.3 do you have? Unplug Maf and see if it will rev then.
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Old Oct 28, 2014 | 08:04 PM
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2002. Unplugged maf ... nothing changed but the sec light came on. Still won't rev past 1500 rpm's.
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Old Oct 29, 2014 | 09:41 AM
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Is that throttle cable or dbw? You will probably need someone with tuning software to take a look. When you push down the throttle does the throttle blade open all the way?
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Old Oct 30, 2014 | 09:08 AM
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Yeah, it turned out supposedly there are two abuse modes one was turned off and the other was left on. Got it fixed yesterday. All good. Thanks.
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