Dag12141987

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..

Dag12141987

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

Old Geezer

iTrader: (3)

What PCM is being used? Programmed for cable or drive by wire?

Dag12141987

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.

brandon6.0

iTrader: (32)

what kind of throttle bodie? stock?

Dag12141987

Stock truck

fst100

iTrader: (5)

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%

Dag12141987

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 ...

Dag12141987

No luck.

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

nine8ss

iTrader: (5)

What is the TPS voltage now that it idles @ 2500?

Dag12141987

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.

LS1MCSS

iTrader: (18)

Has the tune been changed to match the 26lb injectors?

Dag12141987

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.

tsench

iTrader: (15)

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

Dag12141987

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?

tsench

iTrader: (15)

Here follow this diagram to test at the connector lmk how its goes

tsench

iTrader: (15)

If u get all the correct wires on the connector and scanner still can't see tps % time to try out a new pcm

Dag12141987

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.

JoeNova

Are you sure the TPS signal wire is pinned into the correct spot on the PCM?