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Wideband reading very lean

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5.5K views 6 replies 3 participants last post by  spyder79  
#1 ·
I have a glowshift wideband installed that was working flawlessly until I did some upgrades. I've since pulled the head and went through all of the gaskets and belts, replaced the turbo, ported a bunch of stuff and added a 2.5" DP.

The car is just now coming back to life with FIC 750s, 190lph walbro, aeromotive FPR set (vac off) at 43 psi and a braided line from the (new) fuel filter to rail. I'm getting fuel, the car runs relatively smooth for being completely untuned. It smells a little rich even, but will flash 20 afr on the gauge nearly the entire time it is powered on.

Presuming there are no vac leaks, no exhaust leaks and no fuel leaks. I know when in a DSM's off throttle fuel cut, my gauge will peg lean and flash 20. It is doing this all the time, but I don't see any running issues aside from being un-tuned (working on it).

I cruised the car just a little, not getting crazy with it, and saw the gauge jump from 20+ to a metered 10-12afr, then back up to 20 after slamming back to an unmetered -10 afr.

Does this sound like the gauge is displaying the only thing it knows when reading an AFR too fat for it's capability? I am not trusting it's 20+ flashing because the car would run like crap if it were that lean all the time.
 
#3 ·
What are you using to tune/log with? It could be the gauge going out, is it grounded good? I know my AEM WB needs a good ground. I would tune your idle first, then see what the gauge does. With your new upgrades and no tune, you would be running pig rich all the time. The ECU will try to compensate for the extra fuel at idle, but its probably beyond its limits. Get a tune for idle, then see if the WB goes stoch (14.7-15.2) That way you will know right away if its the WB when you have your fuel trims in line.
 
#4 ·
I don't have my WB wired to the ECM yet, so I can't log it yet. I am using EvoScan and ECMLink to tune. I tried to set my injector scaling and MS dead line vs. voltage yesterday, but I don't think it took. I was trying to test the ceddy mods rev limiter (set it at 2k) to make sure my flashing was working properly, and I didn't get anywhere.

The gauge is grounded well, but I will look into it. It is running rich, but the WB reads opposite, although I think it's just a due to a flaw in what the gauge is capable of. GlowShift told me otherwise, but I still have my doubts. I'll try to dial in my idle and let you know how it goes.
 
#5 ·
I'm confused. Are you using ecmlink, or flashing your ecu? You don't go by voltage to tune for idle, you want to go by fuel trims. You want your low and high fuel trims to be as close to zero as they can. Let me know what you are using and we can go from there.
 
#6 ·
He is using ecuflash and flashing his ecu. First you need to scale your injectors and post a log after. Most widebands will read the richest usually 10.0 when it is too rich to meter.
 
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