Mass Air Conversion
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Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Mass Air Conversion
I haven't really been able to find a definite answer on this question, so I thought I'd post it here.
I'm going to convert the Speed Density EFI 5.0 that's going into my Ranger to Mass Air. I'm cheap, so I plan to use junkyard parts. My engine and wiring harness came out of an '88 Mustang. Today I found a '95 Cougar 5.0 HO. I know I need the Mass Air sensor and the computer. It's an auto and I'm going with the 5 speed, but that's ok, the auto computer's programmed a little more aggressively anyway to compensate for the power loss from the slushbox.
I have heard somewhere that the Mustangs were wired to sequentially fire the injectors rather than batch fire them, even on SD sytems so the wiring harness doesn't need to be changed. Is this true? If so, how does the MAF wire up? Does it have it's own harness, or do I need to get the engine harness from the Cougar anyway? He wants 250 bucks for the harness, MAF, intake tubes and computer. This seems a little steep to me for junkyard parts, but not really out of line. So, anyone got some answers? Thanks, -TD
I'm going to convert the Speed Density EFI 5.0 that's going into my Ranger to Mass Air. I'm cheap, so I plan to use junkyard parts. My engine and wiring harness came out of an '88 Mustang. Today I found a '95 Cougar 5.0 HO. I know I need the Mass Air sensor and the computer. It's an auto and I'm going with the 5 speed, but that's ok, the auto computer's programmed a little more aggressively anyway to compensate for the power loss from the slushbox.
I have heard somewhere that the Mustangs were wired to sequentially fire the injectors rather than batch fire them, even on SD sytems so the wiring harness doesn't need to be changed. Is this true? If so, how does the MAF wire up? Does it have it's own harness, or do I need to get the engine harness from the Cougar anyway? He wants 250 bucks for the harness, MAF, intake tubes and computer. This seems a little steep to me for junkyard parts, but not really out of line. So, anyone got some answers? Thanks, -TD
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Joined: Dec 2004
Posts: 2,941
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From: Maple Valley, WA
You shouldnt need the whole harness. All you would need is the 4 wire plug that goes to the MAF sensor and install that into the plug that attaches to your computer. To find out where that goes, I would get a chiltons for the mustang 79-93 and decifer what you need and what needs to be cut out on that engine harness. other than the MAP sensor and the addition of the MAF sensor, the harnesses should be the same.
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Joined: Apr 2005
Posts: 203
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From: Anderson, SC
I don't think any sd were sequintal i'm pretty sure they were all batch fire. Get the MAF and computer from the junkyard make your own harness for the injectors and the MAF that will help cost a little and $250 sounds a little to steep. go to www.fordfuelinjection.com and it will give you more info on making the harness.
If your intrested(Just pm me) i have an A9P ecm that works just tested this saturday. Go to ebay and you should be able to find a MAF for a pretty good price usualy less than $70.
i did a MAF conversion on my 93 5.0 F 150 and just finished so every thing is still pretty fresh in my head as to what i did so if you need any help with the harness i can make a drawing and scan it and email it to you
also look for a book called ford fuel injection and electronic engine controll (you can find it at amazon) this will help alot with the wiring. it has wiring diagrams and it shows what the pins on the ecm are.
If your intrested(Just pm me) i have an A9P ecm that works just tested this saturday. Go to ebay and you should be able to find a MAF for a pretty good price usualy less than $70.
i did a MAF conversion on my 93 5.0 F 150 and just finished so every thing is still pretty fresh in my head as to what i did so if you need any help with the harness i can make a drawing and scan it and email it to you
also look for a book called ford fuel injection and electronic engine controll (you can find it at amazon) this will help alot with the wiring. it has wiring diagrams and it shows what the pins on the ecm are.
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Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Well, now I'm wondering if that '95 Cougar is OBD II. I didn't think to look yesterday. I've looked on Ebay, but I didn't want to buy everything piece by piece and I only found one complete setup, and it wound up going for almost 300 bucks. That's the problem with Ebay, people start trying outbid each other and wind up paying more than the item is worth a lot of the time.
As it happens, I've already ordered that book from Amazon, along with Ben Watson's "How to Tune and Modify Ford Fuel Injection". Guess I've got to really do some homework. Thanks for the replies. -TD
As it happens, I've already ordered that book from Amazon, along with Ben Watson's "How to Tune and Modify Ford Fuel Injection". Guess I've got to really do some homework. Thanks for the replies. -TD
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Joined: Jul 2002
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From: Bend,OR
well i doubt that 95 coug would be obd-II but i doubt it has the right ecu for what your wanting. i would get the entire harness from a 88-93 mustang or tbird. this will get you the best setup and for that little ranger be plenty long to locate the ecu in the clovebox or driver kickpanel
Senior User
Joined: Apr 2005
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From: Anderson, SC
He's in california so there is a pretty good chance that it is OBD-II. California cars got the OBD-II stuff a year before every where else did.
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Hotshot
Joined: Jul 2002
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From: Bend,OR
yea they did, but i dont recall the 94-95 stangs being obd-II . they didnt get that till 96 when they switched over to the 4.6ltr
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From: Concord, NC
My sister's mustang with the 3.8 is OBD-II and it's a 95. The 5.0's didn't go OBD-II to my knowledge. But back to the topic of mass air conversion. The site I usually reference seems to be down, not sure if it is permanent or not, but here is the link anyway: http://bjoern.brembs.net/cars/maf_conversion/ . Lots of good info there, as well as on http://fordfuelinjection.com . I would probably pass on the '95 cougar, as the computer from that won't be as good as a computer from an '89-'93 mustang. If the cougar was like the '94 and '95 mustangs, there are several differences that aren't so great from a performance point of view. The '88 speed density mustang is sequential injection! All you would need to add to that harness are the four pins for the mass air meter - a power, ground, and two signal wires. The ford fuel injection website linked above has a few wiring diagrams that would be helpful, as well as several informative write ups about different things dealing with fuel injection and engine computers that might be helpful in figuring out what you need to do. I second the recommendation for the Ford Fuel Injection and Electronic Engine Control book. It is a wonderful reference, just make sure you get the one for '89-'93 year range.
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Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Ah, that's what I thought. My understanding was that trucks had batch firing of the injectors with SD, but the Mustangs had sequential firing. So really, all I need is the ECM and the MAF, plus the connector to wire up the Mass Air sensor. I can deal with that...! Thanks for all the help! -TD
Last edited by TigerDan; Jun 1, 2005 at 06:49 PM.