Anything about Ford EEC tuning. TwEECer and Moates questions dominate, but there's some SCT and OBD-II knowledge too.

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2.3 turbo. Constantly rich at idle

Post by Pwrshft99 » Mon Aug 05, 2019 8:34 am

Have a 2.3 turbo converted to OBD2 in a 96 Ranger. I have both a TwEECer and SCT advantage software. I've ran both an 80mm MAF and currently an OEM slot. My injectors are 42lbs.

No matter where I make tuning changes, the truck idles at 11 to 1 on the wideband. The A/F responds to other changes I makes throughout the power band but at idle, always excessively rich.

Could this be a sign of cheap injectors not opening and closing at idle like they should?

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Re: 2.3 turbo. Constantly rich at idle

Post by cgrey8 » Mon Aug 05, 2019 8:42 am

More details about how you have the tune setup would be helpful. For instance,
Are you running force Open Loop or are you allowing Closed Loop at idle?
Is the tune reporting that it is in Closed Loop at idle?
If it is, does the HEGO switch rich/lean/rich while at idle?

If you are forcing OL, then there may be tune related reasons why your fuel tables are being ignored in favor of some idle-specific open loop fueling. I'm just not familiar with 2.3L strats to know if that's a possibility.
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89 Ranger Supercab, 331 w/GT40p heads, ported Explorer lower, Crane Powermax 2020 cam, FMS Explorer (GT40p) headers, aftermarket T5 'Z-Spec', GUFB, Moates QuarterHorse tuned using BE&EA


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Re: 2.3 turbo. Constantly rich at idle

Post by Chucko » Mon Aug 05, 2019 11:26 am

Is the O2 sensor upstream or downstream from the turbo? If it's downstream, it could be cooling off at idle.
'89 LX 5.0, Crane 2040, Pro-M 75mm Bullet, 65 mm TB, ported stock intake & E7TE heads, 24 lb injs., JBA shortys, cat X-pipe, A3M1 (GUFB strategy) w/Moates Quarterhorse, BE & EA, close ratio T5Z, 3.55 rear

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Re: 2.3 turbo. Constantly rich at idle

Post by motorhead1991 » Tue Aug 27, 2019 10:57 pm

What is your injector pulsewidth? It's pretty telling in cases like this.

There aren't any separate controls for idle fuel that I remember seeing, but the MAF flow has to be really low as well.
1990 Ford Ranger FLH2 conversion. Ford forged/dished pistons, Total Seal file-fit rings, Clevite rod and main bearings, Clevite cam bearings, IHI turbo, Siemens Deka 60lb/hr injectors, Ford slot MAF in custom 3" housing. Moates Quarterhorse with Binary Editor, using the PAAD6 database.

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Re: 2.3 turbo. Constantly rich at idle

Post by EDS50 » Wed Aug 28, 2019 5:26 pm

Not sure if its relevant or available in your strategy but there are a number of fuel open loop multiplier functions that you can look into.
1992 Mustang LX - 25.1c Chassis, Vortech Blown Dart 333 on Meth, Lentech Trans, TRZ Backhalf, A9P Tune, Moates QH/SL v1.9, BE, EA, TunerView

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