casey.mikl

Hello, I know it has been a long time since I have been on here. I since bought a new truck and this one has been collecting dust in the yard. I got around to working on it again today as I have a buddy that is buying it from me. Turns out this whole time, the fix was a DENSO 02 sensor. Part number 234-4563 for the upstream sensor. If anyone ever has a 02 sensor code and you need to replace the sensors. MAKE SURE AND USE DENSO 02 SENSORS. THE OTHER BRANDS DO NOT WORK. All this time and a simple $37 sensor on Amazon fixed all the issues this truck had.

I am going to swap the sensors over and see if the issue moves with it. I put a Bosch sensor in it at first and messed the threads up. Then I replaced the bung and removed cats and installed an Amazon sensor. I have to find a tap to clean the threads in the Bosch sensor. It’s brand new maybe was in for a week but the threads are full of metal.

I don’t believe the 02 sensor is my issue but I’m going to try and swap the 2 up stream sensors and see if the issue moves. That will atleast point me in a better direction. I’ve had various people look at the truck but they don’t want to buy it with the misfire. It’s driving me crazy and I want to get it sold.

It’s been a while but tomorrow morning I am going to attempt to look at it again. Im going to see if I can do a crank position relearn as I don’t believe I did it when I changed the crank sensor. Also im going to pull Both upstream 02 sensors and swap sides to see if my problem moves to the other side. I have the truck listed for sale but no interest due to the misfire. It also has a bad steering angle sensor I may replace before it sells as well to get rid of all the lights.

Did this fix your issue? That could make sense, the transmission was rebuilt and it did not start up for a while after. The plug may not have been fully seated and backed off a tad causing intermittent connection issues.

It has to be some form of sensor issue but I can’t figure it out. I’ve checked wiring between everything and even grounded the computer and still nothing. I don’t understand how out of no where it started this and no matter what I have done or tried it doesn’t fix it

Yep same issue. My father has been an ASE master Tech for more then 30 years. Cannot figure it out to save our lives. I’ve replaced everything I could even think about and nothing has worked. I have no idea what it could possibly be.

I have not. I can’t for the life of me figure it out. Hoping someone will buy it how it sits.

Yes but what is weird is when you first start the truck usually it would run in open loop till the truck warms up. It doesn’t, it runs in closed loop, starts to misfire then switches to open loop.

No I have not. It’s some form of electrical issue. Because when it goes into the loop that uses the 02 sensors. It misfires but when it goes to the default side rhat does not use the sensors it runs fine

Yes I have the old one and a new one. Swapped them and no change.

There are multiple cyl misfire codes and a code for b1s1 02 sensor. I don’t recall the actual code. And I have a snapon solus ultra.

I’m sorry I did check them again and I am getting battery voltage. I’m going to check fuse 18 when I have some extra time.

My voltage at the 02 sensors is like 8 volts. I do not get 12v but it is the same at all 4 sensors. I will try to pull that fuse and apply power and see what happens. I’m suspecting the fuse block. There is literally nothing else that it could possibly be. The truck was also from New York and was around salt and such. So it’s a possibility. I’ll try to look at it today.

I have. I have tested the harness. Tested the sensors. Checked and changed grounds. Nothing has fixed it. The codes are 02 sensor codes yet everything has been replaced and is working fine.

I replaced all 8 injectors, map sensor, maf sensor, crank sensor, swapped throttle body, smoke tested intake and exhaust, checked wire harness, new ecu. Nothing has fixed it. Hasn’t even put a dent in fixing it.

I really hope someone can figure it out. There is 1 forum post I saw online that the guy replaced all 4 02 with I think Bosch sensors and it fixed his issue. I’ve replaced 02 sensors 3 times already with no fix. The codes it pulls is for up steam bank 1 02.

No I have not. I cannot figure it out. I have tried everything but nothing seems to work.

For anyone wondering and future reference. Factory return fitting is fine and works. The issue was the retaining clip was not fully seated and it pushed the return fitting out of the injector. Ordered the kit above and over nighted it for nothing. Atleast I’ll have spare parts now.

I got the truck. It is great. It has a few things that need to be replaced. Pitman arm, idler arm, rear shocks (replacing all with bilstein), rear pinion seal. Truck runs insanely smooth (probably due to the fluidampner) although I did damage an injector return fitting. Under load it blew it off or cracked it. So I’m trying to find a replacement.

I recently purchased a 2007 LMM duramax. It has a fully rebuilt motor with all new bearings, exergy 30% injectors, 64mm stealth turbo, and motor ops 5 position tuner. I beat on it a little bit and when I got home there was a puddle of fuel under the truck. I looked and found fuel leaking at the return fitting on the second injector on the driver side is pouring fuel and feels loose. My question is, being that it has exergy injectors, is the return the same as a factory replacement or do I have to buy the exergy return fittings? I am looking at over nighting the DTECH DT660023 kit. It seems to be the easiest to get at the moment to replace. Or 1 fitting from DHD is $15..

My issue started after I had my transmission rebuilt. I have swapped the throttle body off the wife’s Tahoe and it was having the same issues. I have not figured it out yet.

Also another question as I do not believe the ez lynk is with the truck. If I end up with it. Would you suggest buying a blank ez lynk for gauges or get the edge cts 3?

Are the rear seats different being an extended cab vs crew? Mine has dual power front seats with the full center console.

I would swap mine with it as it is the LT2 console but my interior is black. So I’d have to find a grey LT2 console.