Swap O2 Bank 1 Sensor 1 with Bank 0 Sensor 1; clear the DTCs; rescan; and share the fresh DTCs...
Swap O2 Bank 1 Sensor 1 with Bank 0 Sensor 1; clear the DTCs; rescan; and share the fresh DTCs...
It is far easier and faster to test them with a scan tool or DSO
Thank You Leon Pugh
The reason I tuned it up Sat, was I didn't know when the previous owner did it, and I like to do the maintenance, or have it done,
and I start doing the regular scheduled stuff. I was hoping the tune out would fix the misfire.
I had a large evap leak fixed by a shop last month, the vent solenoid above the gas tank, truck ran good for a while,
but obviously isn't now.
Thx for the advice.
Im not driving it till it's fixed.
Don’t disagree as I’d hang a Tech 2 on it but...Originally Posted by lpugh
Sitting in my drive, the check engine light is now flashing
Havent driven it.
flashing check engine light means bad misfires not just a random one???? really doubt a lazy or tired o2 will cause this extreme of an issue but have been out of it for a while now?
2022 z519 cup 225 merc 4s ser # 3B210484. 2--hds12 live units. 2 poles, atlas plate, ghost, hamby's, active target, merc digital gauges
2002 basscat pantera 3 (dad bought new) sold 8-2-22
2000 stratos 20 ss (bought new) 200 hp Rude ficht great boat/motor sold 11-21
pulled by a 2500HD Denali
proud dad of an ARMY Captain
MAGA
ASE/GM Master tech before tools
Bad fuel possibly , look at a sample
BULLET 21XRS 250 SHO
fill up a mason jar half way with fuel and let it settle out for a hour or so and see what it looks like???
2022 z519 cup 225 merc 4s ser # 3B210484. 2--hds12 live units. 2 poles, atlas plate, ghost, hamby's, active target, merc digital gauges
2002 basscat pantera 3 (dad bought new) sold 8-2-22
2000 stratos 20 ss (bought new) 200 hp Rude ficht great boat/motor sold 11-21
pulled by a 2500HD Denali
proud dad of an ARMY Captain
MAGA
ASE/GM Master tech before tools
What triggers a low voltage code from the o2 sensor? Bad ground, loose connection?
Imo, it would be had (for me) to trace it past the plug.
I don't have a vacuum pump, or a compression gauge, but I know what they do.
Prob have to take to the shop.
What is a decent price / brand of scanner to buy?
Thx
Read post 20 again, Vetronics, snap on are a couple of good ones, without extensive training they will not help though, I do agree you need to find a good tech that is well trained and experienced in these systems. Call you local AAA office and ask for referrals in your area, would be good to find one ASE certified in at least A6, A8 and L1 with experience with GM or a Master Tech, a well qualified tech should be able to pin this down in a hour or two
Again, Compression test first as well vacuum gauge testing, cant stress this enough
Thank You Leon Pugh
Agree. Having a guy trained in how to read these codes and relate to you what all can be wrong causing the codes to show up and the actual problem is a item the code is not for. Can be very overwhelming to say the least. He ain't with us anymore and i got rid of my 2005 now anyway.
Bank 2 catalyst is most likely plugged as previously stated. Loosen the y pipe flange, on both sides if necessary and see how it runs
Last edited by themacman; 03-31-2020 at 11:45 PM. Reason: Spelling
A good scanner will show current misfires by cylinder & also history misfires, a restricted flow converter will show misfires on the same bank of cylinders-even or odd, that said if you started the engine cold and the C.E.L. is flashing this is probably not case, Have the intake plenum gaskets ever been changed ?? over time the seals will shrink back and flatten losing the seal causing cold lean conditions
Last edited by John Br.; 04-01-2020 at 09:09 AM.
What is actually on your plugs? What do they look like and what color was the residue? All on one side lines up with o2 codes? Was the plugs on the same side as the o2 code stated? I might can help with you giving me accurate information. Will try- I taught Automotive for 31 years. 3 of which were teaching diagnosis for GM.
A fuel pressure regulator that leaks down overnight could cause a cold start misfire issue as well, this will typically throw a rich exhaust code but after o2 sensors reach operating temps. fuel leaks thru the regulator directly into the intake manifold
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