Ford Racing MAF Conversion
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Ford Racing MAF Conversion
I just installed a Ford Racing MAF Conversion Kit on my 93 F150 302, 5sp. Big improvement in idling and low end due to the cam change I made a few months ago not being SD friendly. When installing the MAF conversion I forgot that my firing order is not the same as the standard F150 but is the HO firing order. What is the best way to change the firing order on the Ford MAF conversion? Splice the overlay harness or can I move some pins on the connector?
93 F150, 5sp, 4x4
302, GT40P Heads, Crane Powermax 2020 Cam, 1.6 roller rockers, MAC headers, Dynomax exhaust, 4.56 gears.
93 F150, 5sp, 4x4
302, GT40P Heads, Crane Powermax 2020 Cam, 1.6 roller rockers, MAC headers, Dynomax exhaust, 4.56 gears.
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From: Close to Mr. Anderson
i was curious about the same thing, but i was wandering what effect swapping the injectors would have in the O2 sensors? do they allow the computer to distinguish between different injector firing pattern? since 5&4 are swapped to 3&7 should you swap the O2's also?
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From: Concord, NC
There's only one O2 sensor, right? Even on the stock mustangs, the O2 sensors can't switch fast enough to detect the fuel ratio of each individual cylinder anyway, so it really shouldn't make a difference one way or the other.
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From: Close to Mr. Anderson
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From: Close to Mr. Anderson
Originally Posted by EPNCSU2006
There's only one O2 sensor, right? Even on the stock mustangs, the O2 sensors can't switch fast enough to detect the fuel ratio of each individual cylinder anyway, so it really shouldn't make a difference one way or the other.
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From: Concord, NC
Yes you are correct, but with the conversion, another O2 sensor is not added. The one stock O2 sensor is the only one used when converted to MAF with the kit from Ford. Regardless, it shouldn't make a difference. Just change the injector order and drive on 
.
.
Last edited by EPNCSU2006; Apr 6, 2005 at 12:15 AM.
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From: New Jersey
Another option if you're *really* worried is to use the one o2 sensor and feed both HEGO inputs on the mass air EEC. on the 89-93 MA EEC that would be pins 29 and pin 43. It works fine and solves the wandering idle problem with the different firing order.
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Lead Driver
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From: Concord, NC
I think that's what the kit does in the overlay harness, but I don't know for sure. That's exactly what I did when I converted my truck to mass air. No codes, but I think I'll try to wire an O2 sensor in each exhaust manifold this summer and see if it makes any difference.
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Back to my original question, what is the easiest way to change the injector order for the Ford MAF Conversion; cut and splice the overlay harness or move pins in the connector? If moving pins is the prefered way, how do you do it in the overlay harness connector?
I am not really seeing any idling or other problems right now, is it even worth the time to switch the injector order?
I am not really seeing any idling or other problems right now, is it even worth the time to switch the injector order?
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From: New Jersey
Yeah, I'd repin it to make sure things are the way they are supposed to be. I'd repin it at the EEC connector however, instead of in the middle. The EEC connector comes apart really easy... I find smaller connectors difficult to work with as my hand's aren't steady anymore.
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The overlay harness that goes to the injectors fits between the computer and the EEC connector, swapping pins in the EEC connector won't change the injector order will it. Is there a way to move the pins in the connector that fits in between the computer and the EEC connector?
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From: Close to Mr. Anderson
using a L&R HEGO makes a difference according to INJ firing order. i have'nt heard of using 1 HEGO to control both sides. though i'm a novice with EFI, I'm learning by default now... I finally figured out how th make the 460 EEC control the GT,351 (13726548) F.O. no changing of the harness.
Last edited by termyt00; Apr 6, 2005 at 11:23 AM.
Post Fiend
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From: New Jersey
Originally Posted by theedge900
The overlay harness that goes to the injectors fits between the computer and the EEC connector, swapping pins in the EEC connector won't change the injector order will it. Is there a way to move the pins in the connector that fits in between the computer and the EEC connector?
I don't see why not... its a pass through connector.
But then again, I've never used a kit like that because it's expensive. For me its by far less costly to leech from a junkyard, or roll my own. Sooo I'll butt out now