Thanks @brian az
I think you have a little more pipe real estate with the stock manifold. The "collector" so to speak is much further upstream. I'll order another bung and put the 02 farther back one of these days. My truck runs awesome right now so I do not want to mess with it
I assumed that it was not desirable to be downstream of the header flange.
I suppose I could weld in another bung, plug the 1st, and verify that the readings are consistent between the 2 locations.
Thanks everyone.
Holley Sniper 02 install instructions above. They clearly dont want the sensor that far back.
So you are installing after your first exhaust gasket/flange? (Not counting the exhaust mani gasket of course)?
I installed an Innovate Motorsports 3729 Heat-Sink Bung Extender HBX-1 in October (Post #88 on this thread).
I have 6>1 headers and the O2 is as far back as I can get before first gasket/flange.
I'll now be very careful about turning on the key without starting the truck, and also trying to...
I had a saved version of the baseline setup map, 100% fuel prime and 5 fuel prime multipler was indeed stock. I did not mess with that previously.
The truck took a couple seconds to start yesterday at 60%, 3 multiplier, so Ill inch back up towards the stock settings and find a happy medium...
I remembered that I bought the Bosch 02 sensor at O'Reilly's, so they happily exchanged it within the 1 yr warranty period.
Installed new sensor, reduced fuel prime to 60 percent (was at 100%), reduced fuel prime multiplier to 3 (was 5). Started right up and ran perfectly.
I'll report back...
I didnt turn on the igniton repeatedly without starting but this is something good to think about for the future.
I am goinng to try turning down the fuel prime in the sniper map. Currently I am at a 5 out of 10.
Has anyone tried turning off the fuel prime entirely? I wouldnt mind cranking...
Checking back in since I replaced the 02 sensor in November 2023...the replacement Bosch 17025 02 sensor started misbehaving yesterday. It was intermittently pegging at 35.6 AFR on startup. I turned off closed loop and drove around town just fine. The sensor is welded in and mounted per Holleys...
Well my 02 sensor grenaded a few weeks back. Replaced with a Bosch 17025 and just installed an Innovate Motorsports 3729 Heat-Sink Bung Extender HBX-1 tonight.
The white dot on the extender needs to face upstream. The extender only came with a single copper washer 1.6mm thick. Couldn't get the...
Happy to report that I drove to work this AM in the cruiser with multiple accessories on (headlights+heater) and the voltage never dropped below 13.7.
I feel spoiled now...
Last item related to the Sniper rabbit hole is a Dakota Digital RTX cluster so I can have a speedometer and a gas gauge...
The tired 40 amp alternator wasn't up to task following the Sniper install.
With the headlights on I could watch the voltage drop below 12.5 on the Sniper LCD screen when idling at stoplights.
Ordered up a 90 amp internally regulated FJ80 alternator and dropped it in last night (Thanks...
The plunger and spring the the poppet style PCV is waaayyy too big of a hole with the poppet removed. The fixed orifice hole is much smaller about 2mm. You are essentially operating with a massive vacuum leak by gutting the old unit.
Maybe mig weld it (serquential tacks) with 0.024 wire?
Otherwise you could squeeze a large hose over the two pieces and put a couple hose clamps on it.
Either way it will be quite "custom"
That's a completely different setup than my 72.
Are those male threads straight metric or are they tapered NPT style?
Also is the threaded portion steel or aluminum?