Too lean or too rich, no in between! - TundraTalk.net - Toyota Tundra Discussion Forum
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post #1 of 7 (permalink) Old 09-10-2018, 07:35 AM Thread Starter
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SOLVED: AEM AFR gauge reads Too lean or too rich, no in between!

So I took my supercharged truck for a ride after a fresh build which included set of new forged pistons, rods and many more. Since even before the build, my AEM AFR gauge shows too lean readings at idle (16-17.5), high 15s at normal cruising and 10-10.5 at WOT.

The truck got a custom tune, I had a word with my tuner, he suspects that I have a bad fuel pump. Not sure what I am missing here .


UPDATE:

Issue is fixed, the harness plug wired backwards. Now it reads 14.7 at Idle. However, it is still rich at WOT (10.5). It maybe it has to do with an excessive safety factor, anyway I will get a new tune shortly, or even add more boost.

Flex Fuel 2016 | Edition 1794 CM | TRD CAI | Valve body Mod | LT ARH | | 20" Method Roost wheels

2012 rcsb | TRD SC | 18" 41 series Procomp wheels| Valve body Mod | JBA Long tube headers | Airaid CAI | 2/4" SOSperformance LK | Caltracs TB

Last edited by riskydude; 09-16-2018 at 06:27 AM. Reason: updates
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post #2 of 7 (permalink) Old 09-11-2018, 01:06 PM
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Sounds like a bad tune.....

2014 Tundra double-cab 4x4 long-bed with JBA long-tubes, Deeds race exhaust, 4.5" Rough Country lift, airbags and 35x12.5-20 wheels and tires.
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post #3 of 7 (permalink) Old 09-11-2018, 01:06 PM
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More info on your custom tune? DAP? Unichip?
With an engine rebulid like yours, you should swap out your Fuel Pump. I like my Aeromotive 340 stealth pump, it works well for my set up both without and with my new DAP Tune..


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post #4 of 7 (permalink) Old 09-12-2018, 02:34 AM
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Bad fuel pump?
That makes no sense.
If that was the case, you would be running around stoich at idle and cruise, but lean at WOT.
I think you need a proper tune

2010 RCSB ([email protected] on NOS) - AWD conversion, Pauter rods, JE 8.5:1 pistons, Ti int & SS exh valves, Ti retainers, 5 angle valve job, P&P heads, TRD SC w/ 50mm pulley, ASP crank pulley, 84mm TB, SABM, IPT VB, JBA LTs, Killer Chiller, 1.25 Gal IC tank, Frozenboost 101 HE, IKH-24 plugs, A1000 FP, 2"/4" Belltech drop, weight reduction, NOS
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post #5 of 7 (permalink) Old 09-12-2018, 04:50 PM
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gotta love the surplus of info OP supplied and the slow response to any questions .
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post #6 of 7 (permalink) Old 09-15-2018, 04:27 PM Thread Starter
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Turned out to be a wiring issue. Now it reads around 14.8-15.5 at idle, but still rich at wot (10.5).

I will get it tuned soon.

Flex Fuel 2016 | Edition 1794 CM | TRD CAI | Valve body Mod | LT ARH | | 20" Method Roost wheels

2012 rcsb | TRD SC | 18" 41 series Procomp wheels| Valve body Mod | JBA Long tube headers | Airaid CAI | 2/4" SOSperformance LK | Caltracs TB
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post #7 of 7 (permalink) Old 09-16-2018, 01:35 AM
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Quote:
Originally Posted by riskydude View Post
Turned out to be a wiring issue. Now it reads around 14.8-15.5 at idle, but still rich at wot (10.5).

I will get it tuned soon.
thought you already had it tuned?

but we wouldn't know that since you've skirted every legitimate questions raised.
waste of bandwidth this thread is!
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