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ls swap problem ( PLEASE HELP ) if you can

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Old May 16, 2017 | 01:26 PM
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Question ls swap problem ( PLEASE HELP ) if you can

Ok , i know there are people who really know what they are doing on here. And i really need some help. I have been trying to solve this issue for about 6 months now. i have a stock 5.3 with a ls1 intake and 12555894 injectors, and the car will start. and idles ok but when giving gas will fall on its face between 2200 and 2500 . somewhere in there. thought it was the tps so i bought a new one. did the same thing. so i started checking the 3 wires. ground has good ground. 5v wire has 5v. and signal wire goes from .76 to 4.51 wot so everything looked good. I bought a scanner to read live data and noticed the tps sensor reads 0.0 the whole time on scanner , no matter if car is running or not. never changes when throttle is giving or anthing. so im scratching my head hard. every where ive looked on here and other sites i havent seen anyone that has had the same problem. anyone got any ideas please? thank you in advace..

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Old May 16, 2017 | 01:29 PM
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i should note that i read the 5v and ground at the sensor and the signal right before the computer so i know that the signal was making it all the way there. just wanna be as clear as i can to hopfully get this solved
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Old May 17, 2017 | 07:17 AM
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What PCM is being used? Programmed for cable or drive by wire?
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Old May 17, 2017 | 08:43 AM
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Red and blue the one that u can program for either. And yeah its programed for cable. And fuel pressure is at 58 to 60 psi. I've moved it up and down to see if that mattered but no luck.
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Old May 17, 2017 | 08:52 AM
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what kind of throttle bodie? stock?
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Old May 17, 2017 | 09:02 AM
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Stock truck
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Old May 17, 2017 | 09:32 AM
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have you tried TPS relearn?
Key off.
Unplug TPS.
Turn key on for 5 seconds.
Key off.
Plug in TPS.
Turn key on. Closed throttle should be 0%
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Old May 17, 2017 | 09:55 AM
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So unplug tps
Turn key on but don't start for 5 secs
Turn key back off
Plug tps in
And then should I turn key to on without starting
Or start it?
Have not tried this. But I will here in about 10 mins. Anything I should do for iac? Cause I replaced iac ..tps.. and maf ...
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Old May 17, 2017 | 10:24 AM
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No luck.
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Old May 17, 2017 | 10:35 AM
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I messed with tps iac maf and map and now when it starts it tries to idle around 2500. Don't know what happend
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Old May 17, 2017 | 04:05 PM
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Originally Posted by Dag12141987
I messed with tps iac maf and map and now when it starts it tries to idle around 2500. Don't know what happend

What is the TPS voltage now that it idles @ 2500?
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Old May 17, 2017 | 09:11 PM
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Voltage is still .70 closed and around 4.58 wot. With my multimeter but going off scanner hooked to obd2 port.. still reads 0.0 no matter what.
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Old May 18, 2017 | 01:26 AM
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Has the tune been changed to match the 26lb injectors?
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Old May 18, 2017 | 07:38 AM
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Didn't tune myself sent it to a guy in the net. And even asking him today he says yes. Would it idle fine if it wasnt? Before I started messing with it. It would idle ok and just like bog out somewhere around 2200.
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Old May 22, 2017 | 02:35 PM
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Are u using stock harness and if u get voltage on multimeter meaning sensor is good also I might have the pig tail hook up wrong
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Old May 22, 2017 | 09:59 PM
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Yeah. Harness is stock. Worked to stand alone. All un needed wires removed. And all 3 wires go where they are suposed to. Checking from sensor all the way back to computer. I'm just mind blown I can't figure this out. Probably somthing so easy I'm overlooking it. That would be my luck. Any ideas?
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Old May 23, 2017 | 11:42 AM
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Here follow this diagram to test at the connector lmk how its goes
Attached Thumbnails ls swap problem ( PLEASE HELP ) if you can-throttle-position-sensor.gif  
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Old May 24, 2017 | 12:21 PM
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If u get all the correct wires on the connector and scanner still can't see tps % time to try out a new pcm
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Old May 25, 2017 | 01:43 PM
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Originally Posted by tsench
If u get all the correct wires on the connector and scanner still can't see tps % time to try out a new pcm
Ok seeseen on another post somewhere on herhere to test all 3 tps wires using ground off battery. So I am going to do that real quick both with koeoff and koeon I will post what I get and maybe someone can see something off.
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Old May 25, 2017 | 02:17 PM
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Are you sure the TPS signal wire is pinned into the correct spot on the PCM?
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