thenova70ss

iTrader: (2)

Guys i have a 2005 Chevy truck with a 5.3 i am looking at for a friend he was on his way to work the other day and it just started losing power and missing we hooked it to my computer and it shows a Random miss fire but just on the passenger side of the motor so we put new plugs and wires on it and that did not fix it.

So i hooked it to my Hp Tuners and this is what i found NO reading from the front O2 are the Injectors at all take a look at the Data Log i made with my Hp Tuner and let me know what you guys think it could be.

We checked Compression and fuel pressure and all that was good we changed Injectors from the Driver side to the Passengers Side and Nothing just the same so we know its not the Injectors. Its juts crazy that its only on the Passenger side you can unhook all the Injectors from that said and it keeps running and not throwing a code at all but as soon as you unhook one for the Driver side it will give a code.

Any help would be GREAT this guy has 4 kids and cant spend a lot of money on just changing out parts to try and fix it i think the ECM is bad but a new on is $300 and we need to know for sure so not to waste $300 and not fix it.

thenova70ss

iTrader: (2)

We all so Checked all the Grounds all of them are Hooked up and Good.

STEEPSS

iTrader: (30)

First off, a new pcm is NOT $300, More like $100, on a bad day.

However, I'd check your wiring first. Make sure it checks out for continuity in the injector circuit.

thenova70ss

iTrader: (2)

You need to Price the PCM at Autozone thats what one cost Flashed. But i did find a new one on Ebay for $100 Flashed.

STEEPSS

iTrader: (30)

Ok, i was talking about a new to you, not off the shelf.

ls1nova71

iTrader: (4)

I'd try the boneyard before going to Autozone or some place like that, but that's just me, very rarely see a PCM just go bad. How many miles does this truck have on it? Did you check all the fuses? If it has a lot of miles or has ever been wrecked, I'd be more inclined to thing a wire has chaffed or broken somewhere, and maybe shorted to ground or is open.

jwatts

iTrader: (4)

If you decide it's the PCM, let me know. I have one from an 06 1500 with a 5.3 I would part with for way less than $300.

Silver6sp

iTrader: (2)

Sounds dumb but check your fuses, I think there is a fuse for driver side inj and pass side inj. This happened to me in my camaro, I scrapped my headers on a driveway and it popped one side. I had no inj pulse at all and found that

superbean

What other steps have you done to correct this? Check continuity from pcm signals to injector clips to rule out short to grounds in the harness. I hope it's not a pcm, had a friends silverado randomly drop injectors and injector driver was burnt in pcm.. although it's the only one ive known to go bad...