Hey guys. I got an 04 silverado. I posted a few weeks ago about my hassle I had with my longtubes. Problem is this time, I'm shooting 3 foot flames out of my exhaust!! The truck is un driveable because I can't even get over 20, it's bogging and popping like crazy! Noticed it last night on the highway and the flames were shooting into the other lane! It was unreal!
No idea what's causing it, has all new plugs wires o2cencors and longtubes. I'm fixing the truck and selling it, not buying another gm.

 

does it have a tune?

Cleaned the MAF?

Flames could come from a overly rich AFR, Do you have any exhaust leaks?

 

Yeh, need to know more bout it, mods, tune ect. That isn't normal by no means.

 

All the truck has for mods is longtube headers, cats, flowmaster 10 muffler. It was running fine then all of a sudden ran like ****. No tune or anything

 

Im thinking your cheap headers and bad shop is your cause of problems...

https://www.performancetrucks.net/fo...eaders-515150/




was it running good before you took it to that shop?

 

Burnt wire on the header tube with the hump and unburned fuel and air being reburned in the exhaust..

 

= flame thrower!!

 

Truck wasn't running to good, reason I got the headers was because my cats were clogged and the ypipe with cats was 1000 bucks . Wires are well away from the headers. I ordered wires that you can bend solidly around each header bump. Driving home last night melted my plastics off my back bumper

 

I fixed a truck that someone had installed the wrong o2 sensors in. In closed loop it was giving a -100 fuel trim. Needless to say, it drove like complete crap. Does it do fine when its cold/ in open loop?

 

Runs like **** 24/7 but doesn't run as bad when I first drive it for 2 or 3 minutes