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

Moderators: cgrey8, EDS50, Jon 94GT, 2Shaker

Post Reply
David Claflin
Tuning Addict
Posts: 569
Joined: Fri Jul 07, 2006 5:23 pm

A9L tuning, KAM barely deviates from 1, but wideband shows 11:1 at cruise

Post by David Claflin » Wed Aug 12, 2026 2:41 pm

Got this thing running after complete disassembly, paint and reassy, seems to run fine, just rich, did a datlog, and was watching wideband, lambse, and HEGO. Sensors seemed to track with what wideband showed, they're switching fine, but the one thing I've noticed is that while it's running rich at cruise, the KAM barely moves off 1, if at all. With other cars I've seen it show .95, or 1.10, this car is typically at 1, or maybe .99-.98, even though WB shows 11 at light cruise with 38 degrees of spark. I've looked through the tune and found nothing off from what my other cars have. Only thing I've got different on this is I'm running a Pro-M duo with two slot meters.
This car is a street car, but it will most likely spend more time at the track then cruising around, I've not encountered anything like this before, was curious what folks might think or suggest to check.
1990 LX/A9L/302, Ported RPM heads, Ported Holley SMII, 1 3/4 longtubes, 3"exhaust, T5, 3.73
1985 LTD LX, A9L, ported TW heads, ported Holley SMII,1 3/4 longtubes, 4.10, T5trans, mach 1 brakes.
1986 coupe, A9L, former FHP car, stock shortblock, TW 11R190heads, stock cam +4, VIC Jr EFI. 4-holeTB, Pro-M Duo, 2 slotmeters, 1 3/4 longtubes, 3" exhaust, T5Z, 4.88
1993 LX A3M, 347, 11R205 heads, Ported Holley SMII, 1 3/4 RCI headers, 3" exhaust, 4.10s

Odrapnew
Regular
Posts: 236
Joined: Thu May 08, 2008 3:31 pm
Location: MN

Re: A9L tuning, KAM barely deviates from 1, but wideband shows 11:1 at cruise

Post by Odrapnew » Fri Aug 14, 2026 3:49 pm

What are your short term fuel trims?
If you are running at constant 11:1 AFR, that means you are likely in open loop.
Long term fuel trims won't update if you are in open loop.
Also, if you are in open loop and your commanded AFR does not match your measured AFR, you need to dial in your fueling (injectors, MAF…etc)
'89 Notch, 304(5.0), Novi2K@13psi (currently not installed) TFS heads, TFS Stage 1 cam, Cobra intake, 60lb'ers and 4" MAF with Ford slot sensor, longtubes_x-pipe_flowmasters and more crap that doesnt increase power. 437rwhp@5500(and still climbing)/438rwtq@~4000rpm Tweecer R/T w_BE and EA

David Claflin
Tuning Addict
Posts: 569
Joined: Fri Jul 07, 2006 5:23 pm

Re: A9L tuning, KAM barely deviates from 1, but wideband shows 11:1 at cruise

Post by David Claflin » Sun Aug 23, 2026 9:48 am

Had a chance to drive this longer yesterday and I think it was just not being driven long enough after having the battery off. After I drove it for around 10 miles or so straight then it started really making corrections.
1990 LX/A9L/302, Ported RPM heads, Ported Holley SMII, 1 3/4 longtubes, 3"exhaust, T5, 3.73
1985 LTD LX, A9L, ported TW heads, ported Holley SMII,1 3/4 longtubes, 4.10, T5trans, mach 1 brakes.
1986 coupe, A9L, former FHP car, stock shortblock, TW 11R190heads, stock cam +4, VIC Jr EFI. 4-holeTB, Pro-M Duo, 2 slotmeters, 1 3/4 longtubes, 3" exhaust, T5Z, 4.88
1993 LX A3M, 347, 11R205 heads, Ported Holley SMII, 1 3/4 RCI headers, 3" exhaust, 4.10s

Post Reply

Who is online

Users browsing this forum: No registered users and 54 guests