SD to MAF Conversion
New User
Joined: Jan 2016
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Thanks! I just found the plug for the MAF and I think I'm ready to start tearing into it. But before I do I just want to be 100% sure I'm understanding this right. Will following this list will give me the correct firing order? And I just cut out the injector portion of my trucks harness and wire the MAF and injector portion of this harness directly to the plug for the PCM?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Here is a link for the Mustang wiring harness pinouts at the EEC connector with more detail and wire color codes.. just found this and it looks pretty good.
http://r.search.yahoo.com/_ylt=A0LEV...TJhS6SNFcCvJQ-
http://r.search.yahoo.com/_ylt=A0LEV...TJhS6SNFcCvJQ-
Lead Driver
Joined: Sep 2003
Posts: 7,013
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From: SoCal
That's true for all 1988 Mustangs outside of California. 1988 California Mustangs with the 5.0 engine were the first to get MAF.
New User
Joined: Jan 2016
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I found a " '92 " marked on the back of one of the plugs on the harness, so I'm not sure how true the info from the CL parts guy was
I cut that one up and made and injector and MAF harness to be pined into the PCM. I'm still not sure what needs to be taken out of the existing truck harness.
I have started and ran it with the factory SD. It runs and idles OK in park but it won't do
I cut that one up and made and injector and MAF harness to be pined into the PCM. I'm still not sure what needs to be taken out of the existing truck harness.
I have started and ran it with the factory SD. It runs and idles OK in park but it won't do
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New User
Joined: Jan 2016
Posts: 21
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I found a " '92 " marked on the back of one of the plugs on the harness, so I'm not sure how true the info from the CL parts guy was
I cut that one up and made and injector and MAF harness to be pined into the PCM. I'm still not sure what needs to be taken out of the existing truck harness.
I have started and ran it with the factory SD. It runs and idles OK in park but it won't do
I cut that one up and made and injector and MAF harness to be pined into the PCM. I'm still not sure what needs to be taken out of the existing truck harness.
I have started and ran it with the factory SD. It runs and idles OK in park but it won't do
New User
Joined: Jan 2016
Posts: 21
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https://youtu.be/mnnTgXkHU9Q
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
You don't really need to remove anything from the truck harness, when I did my '90 I cut off all the factory injector connectors but you could just put them aside too, everything else gets reused.
Moderator
Joined: Jun 2003
Posts: 3,547
Likes: 71
From: Calhoun GA
A little more engine info would be helpful...what are the specs on the 'RV cam', and the FR heads?
The first thing that grabs my attention to the fact that it will only idle is the over-sized throttle body.
The first thing that grabs my attention to the fact that it will only idle is the over-sized throttle body.
New User
Joined: Jan 2016
Posts: 21
Likes: 0
Also the #9 pin for the MAF return was supposed to be empty but it wasn't. I unplugged the pin that was there and taped it off and put the MAF return there.
Any ideas on what I might've done wrong, or what could cause the fuel pump to run all the time, or what was in the #9 spot, or another spot for the MAF return?? I'll be here pulling my hair out and staring blankly at the connector, thanks guys!
