Another 6.2 for 5.3 swap going on.

[randeez]

the dsxtuning kit is just about plug and play except for adding the pin to the ecm, but even that is easy.

by the time you buy the qdc adapters, sensor, pigtail (wire it), and make up a hose you dont come out much cheaper.

 

[iamdub]

the dsxtuning kit is just about plug and play except for adding the pin to the ecm, but even that is easy.

by the time you buy the qdc adapters, sensor, pigtail (wire it), and make up a hose you dont come out much cheaper.

Just watched a Goat Rope Garage video on this. He used a GM sensor, and some stainless unions. Just cut a section out of the fuel pipe on the frame rail and spliced it in. He didn't specify on the wiring, though. That DSXTuning kit locates it on the manifold. I already have 3/8" QDs for the factory nylon hoses, so maybe I can splice it in near the tank. My concern is having a leak on top of the engine.

 

[randeez]

They call it a firewall for a reason

 

[iamdub]

They call it a firewall for a reason

 

[ls1frc]

https://dsxtuning.com/collections/f...-2006-2009-trailblazer-ss?variant=55854293515

Just found an e85 station near my house. Im buying this lol.

 

[PatDTN]

So a pretty dark day for me. I just showed up at the tuner because they weren't being very responsive over the phone. They told me the truck was almost done but that the right side catalytic converter was "pretty clogged" and I needed to be careful driving it so it didn't overheat that on my way home. I left their lot with it feeling funky and only got about half a mile before the truck shut down.

After sitting in the cold for a while and waiting for them to call me back with some kind of explanation and solution I started it again to see if I could limp it home in chunks to get at the cats myself.

It drove a bit farther and I noticed I had the oil pressure nearly pegged. ?? Shortly after that, ripping along at 20 mph with bad noises I looked again and my oil pressure was sitting on zero. Shit! I shut it down again and coasted to the safest spot I could find and checked the oil. Gone. Nothing on the dipstick and smoke coming out of the tube. WTF!

I finally called AAA to get me home and sat on the road for almost 3 hours waiting for them. Some amazing people asked if I was okay and half kidding I told one guy I could use some oil. He pulled over and pulled out a jug and funnel and we poured some in. Now on the dipstick I started it again to find no oil pressure. I let it run a few seconds knowing it could take a bit to prime the system. Still nothing so I shut it down.

Eventually the AAA app on my phone said the truck was there except it wasn't. I waited a while longer and fearing the truck had gone up a driveway and wss hooking up someone else's white Tahoe I dialed AAA and sat on hold a couple more minutes. Just as I got a person I saw the truck. Nice driver got my Tahoe home. It's in the garage waiting for me to figure out what all is wrong now. Oh yeah, sitting on the road with the radio and flashers on the battery died completely so i didn't even have flashers.

 

[PatDTN]

I need to get new cats. I can't afford anything exotic but I'm not sure what to get. From behind the Y pipe it's stock 5.3. Obviously the new engine is 6.2. If I buy the Y pipe with cats for the 6.2 will it bolt up to my system?

 

[ls1frc]

Sounds awful man sorry.

I hope the oil pressure issue isnt from running with no oil and damaging the bearings.

 

[ls1frc]

I need to get new cats. I can't afford anything exotic but I'm not sure what to get. From behind the Y pipe it's stock 5.3. Obviously the new engine is 6.2. If I buy the Y pipe with cats for the 6.2 will it bolt up to my system?

The y pipe with cats from GM costs more than a lot of header systems.

 

[Tonyrodz]

So a pretty dark day for me. I just showed up at the tuner because they weren't being very responsive over the phone. They told me the truck was almost done but that the right side catalytic converter was "pretty clogged" and I needed to be careful driving it so it didn't overheat that on my way home. I left their lot with it feeling funky and only got about half a mile before the truck shut down.

After sitting in the cold for a while and waiting for them to call me back with some kind of explanation and solution I started it again to see if I could limp it home in chunks to get at the cats myself.

It drove a bit farther and I noticed I had the oil pressure nearly pegged. ?? Shortly after that, ripping along at 20 mph with bad noises I looked again and my oil pressure was sitting on zero. Shit! I shut it down again and coasted to the safest spot I could find and checked the oil. Gone. Nothing on the dipstick and smoke coming out of the tube. WTF!

I finally called AAA to get me home and sat on the road for almost 3 hours waiting for them. Some amazing people asked if I was okay and half kidding I told one guy I could use some oil. He pulled over and pulled out a jug and funnel and we poured some in. Now on the dipstick I started it again to find no oil pressure. I let it run a few seconds knowing it could take a bit to prime the system. Still nothing so I shut it down.

Eventually the AAA app on my phone said the truck was there except it wasn't. I waited a while longer and fearing the truck had gone up a driveway and wss hooking up someone else's white Tahoe I dialed AAA and sat on hold a couple more minutes. Just as I got a person I saw the truck. Nice driver got my Tahoe home. It's in the garage waiting for me to figure out what all is wrong now. Oh yeah, sitting on the road with the radio and flashers on the battery died completely so i didn't even have flashers.

That totally sux! I wonder if your tuner was somehow at fault. Got my fingers crossed for you buddy!!!

 

[PatDTN]

The y pipe with cats from GM costs more than a lot of header systems.

I'd really prefer to run cats. I know I'll have to pay more but either way I need either the Y pipe or I get weld in cats that I can screw up.

So back to my question. Is the 6.2 Y bigger and if so will it bolt up so I can run it until I'm in a better situation ?

 

[ls1frc]

6.2 donut connection is bigger than 5 3 donut

 

[PatDTN]

6.2 donut connection is bigger than 5 3 donut

At the exhaust manifold? That bolted up using the 6.2 manifolds. Or do you mean the downstream end?

Thanks for a quick reply.

 

[ls1frc]

The manifolds are the same between vehicles
The y-pipe is different. The 6.2 y pipe has a larger donut connection because the catback is 3.5 inches. The 5.3 y pipe is for connecting to the stock 2.75" exhaust.

What diagnosis was done to see the cats are clogged?

 

[PatDTN]

The right side is completely blocked somehow. You can hear the exhaust hissing out.

 

[PatDTN]

Getting the Y pipe out is a pain. I had to drop the sway bar down and support the transmission and transfer case while I dropped the transmission support. As I was getting the pipe down I could hear something rattling inside. I thought maybe I found the nut I lost before.

When I pulled the pipe out from under the car I could see right away there were issues with the catalysts on both sides. I tipped it up to dump the nut out. Um...

This stuff poured out.

Closer look you start to see some structure.

Yep. That used to be the honeycomb catalyst. Note that I didn't break these up. Both sides were shattered into crumbs and were blocking the pipe. I ordered the new Y pipe before I took this out but it'll be days before it comes. Meanwhile I'm going to finish hollowing this pipe out and put it back in place to examine what I did to the engine.

I've got this lump sitting in my basement. I have to figure out what I'll do with it.

Having seen the blockage I now have a better understanding of what happened to my old engine. The AFM might not be the culprit. The blockage pressurized the block and blew the oil out any way it could. That turned out to be into the intake manifold where it exacerbated the issue by further blocking the catalyst.

 

[PatDTN]

A somewhat hopeful update for today. I finished emptying the Y pipe and got it installed then I tried to prime the oil pump only to figure out it's full. So I put things all back together and started the truck. Hm. 80 psi oil pressure. After things warmed up I got zero again. No lifter tick though. No issues whatever related to complete lack of oil pressure. Why?

I'm realizing the oil pressure sensor is bad. So that HUGE bullet is dodged I think. I'll know for sure when I put another new sensor in.

Oh and this thing SCOOTS now. Yowza! I can't wait until it is finished with the new cats and the final tune. The difference will be even bigger since the cats were choking the 5.3 down badly and now this 6.2 can exhale. Funny how bad the exhaust stinks now without any cats in. Should I put the now empty pipe on the market? :-D

 

[ls1frc]

Thats great news on the oil pressure

 

[wjburken]

A somewhat hopeful update for today. I finished emptying the Y pipe and got it installed then I tried to prime the oil pump only to figure out it's full. So I put things all back together and started the truck. Hm. 80 psi oil pressure. After things warmed up I got zero again. No lifter tick though. No issues whatever related to complete lack of oil pressure. Why?

I'm realizing the oil pressure sensor is bad. So that HUGE bullet is dodged I think. I'll know for sure when I put another new sensor in.

Oh and this thing SCOOTS now. Yowza! I can't wait until it is finished with the new cats and the final tune. The difference will be even bigger since the cats were choking the 5.3 down badly and now this 6.2 can exhale. Funny how bad the exhaust stinks now without any cats in. Should I put the now empty pipe on the market? :-D

Glad things are looking up for you.

Did you by chance put an analog oil pressure gauge on your vehicle to confirm that you truly have good oil pressure? I would be very hesitant to see how well it “Scoots” until I’ve confirmed that bit of information.

 

[PatDTN]

Glad things are looking up for you.

Did you by chance put an analog oil pressure gauge on your vehicle to confirm that you truly have good oil pressure? I would be very hesitant to see how well it “Scoots” until I’ve confirmed that bit of information.

I do still need to confirm the oil pressure I know. It showed 80 psi when I started it and pulled out of the garage. I closed the door and it still showed 80. That seems really high even given the high volume pump so I wasn't trusting the reading. It was still high so I decided to drive a little. It kept that reading for a while then dropped straight to zero. I popped the hood and there's no clatter of flat lifters or any other symptoms. I still had to get home and decided to risk it.

Tomorrow I'll swap the oil pressure sensor from my old engine and see if I can tap into the pressure somewhere with my gauge.