OP
OP
oldsman003
Member
Had to spend 3 hours yesterday buttoning up the wire harness from having it all apart train about frustrating!
Bad bad bad BAD misfire!
- Thread starter oldsman003
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
#1taho
5150TAHO
Congratulations on the find and repair. She looks like a real nice truck. I am sure you will be happy with it now. So over all what did it cost you ?
Last edited:
OP
OP
oldsman003
Member
Well I have new crank, cam, maf, map sensors, throttle body, pcm, plugs wires coils head gaskets and timing set, upstream o2s and a whole bunch of time and frustration plus $100 in a shoo attempting to diagnose it
SLCHOE
ASE Master Certified + (L1)
A whatnow? Where? Got a picture of it? Never heard of a precat or 3 cats on these trucks, CA or Federal emissions.
Let's say I've worked on these trucks as long as I have and for whatever reason or odds that I've never run into the elusive "bank 2 pre-cat". Why isn't there also a pre-cat on bank 1 and why was it not checked along with your other two long long ago? Something doesn't add up here.
Anyway glad you got it going again. Should have got it going again in post #4 and #6 of this 74 post thread though. LOL
Last edited:
I'm glad you got it running. I have the mid-pipes (w/cats) off a 2004 Yukon Denali (LQ4) and there is only one cat on each side. Does the 2500 have two on the passenger side?
By the way, my passenger side cat is tripping the CEL for low efficiency. I am looking for another used one.
By the way, my passenger side cat is tripping the CEL for low efficiency. I am looking for another used one.
OP
OP
oldsman003
Member
Yeah my truck has "4" cats two main and two previous cat converters. I will try and get a pic today and post. I'm not sure if it's because mine is a 2500 but from the manifolds it bumps to 3" pipe down to upstream o2s then precats then cats then muffler back. 2 true pipes back to the muffler, then on mine has some aftermarket muffler with duel exhaust.
OP
OP
oldsman003
Member
Yeah well like I said nobody ever suspected it being a problem and as you stated never heard of these trucks having more than the main cats. When I saw the bank 1 precat I just figured it was a resonator for back pressure and to quiet the exhaust noise down, it is a yukon. Never crossed my mind
OP
OP
oldsman003
Member
Here's 2 stock photos I finally found the straight 2 section is bank 2 the other is bank 1
OP
OP
oldsman003
Member
Here's 2 stock photos I finally found the straight 2 section is bank 2 the other is bank 1
SLCHOE
ASE Master Certified + (L1)
OK so you have 4 cats. I was gonna say, I've never heard of a 5.3 with 2 cats on one side and one on the other.
