• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Tapped into the - wire from a fuel injector for

  • Thread starter Thread starter hotmustang331
  • Start date Start date Mar 14, 2007

hotmustang331

Active Member
Apr 29, 2004
2,967
3
48
Bastrop,TX
Mar 14, 2007
#1
  • Mar 14, 2007
  • #1
my Eboost 2's RPM signal wire. Is this and ok thing to do? I had tapped into the - wire from one of my COPs, but apparently our ignition is a CD type. I was getting random readings from 500RPM to 30,000, so that didnt work. So I remembered someone on here saying that you can use the - wire thats coming from a fuel injector. Spliced into that wire on cylinder # 8 (again not the hot/red wire) and the RPM function is working normally....just had to tell it my engines a 1 cylinder motor because its only looking at one cylinder.

So is this going to cause ANY problems with the injector or lean/richness of that cylinder due to the EEC not seeing enough return voltage or something crazy like that? Just want to make sure because the LAST thing I need is a lean cylinder under boost .


BTW I have NO idea where the RPM signal wire that supposedly comes from the EEC is located or I would have used that.
 

BennyBlown2v

New Member
Dec 9, 2004
1,233
1
0
Carmel, INdiana
Mar 14, 2007
#2
  • Mar 14, 2007
  • #2
It should be fine, that's what they use at the dyno. Good luck, when is the dyno appointment again?
 

hotmustang331

Active Member
Apr 29, 2004
2,967
3
48
Bastrop,TX
Mar 14, 2007
#3
  • Mar 14, 2007
  • #3
Awsome! Makes me feel better...thanks.

March 19th! Im stoked! We leave this Sunday...so almost everything is inorder. Video camera goes in the car saturday night....so yea I forgot to get you guys a vid this week, but ill get one on the dyno and hopefully have some fun on the way back.
 

Mike97gt

it doe snot
Founding Member
Jan 26, 1999
10,633
7
89
the people's republic of massachusetts
Mar 14, 2007
#4
  • Mar 14, 2007
  • #4
BennyBlown2v said:
It should be fine, that's what they use at the dyno. Good luck, when is the dyno appointment again?
Click to expand...

+1 you will be fine unless you really badly botched your connections.
 
T

thomas91169

I'd donkey punch my sister.
Aug 19, 2005
0
0
0
Modesto, CA
Mar 15, 2007
#5
  • Mar 15, 2007
  • #5
i would think if your ecu saw a injector was not sending back the correct signal output it would think the injector was dead/dying and pull a code.
 

the98stang

Active Member
Aug 12, 2005
2,408
0
47
Clovis, CA
Mar 15, 2007
#6
  • Mar 15, 2007
  • #6
You are fine. I used that same wire with my window switch.

Can't wait to see your numbers!
 

hotmustang331

Active Member
Apr 29, 2004
2,967
3
48
Bastrop,TX
Mar 15, 2007
#7
  • Mar 15, 2007
  • #7
Great! Thanks all for the responces! One less thing to worry about haha.
 
You must log in or register to reply here.

Similar threads

Resolved Holley terminator integration into CCRM
  • BrandonMP
  • Feb 25, 2026
  • SN95 4.6L Mustang Tech
Replies
1
Views
245
SN95 4.6L Mustang Tech Feb 27, 2026
BrandonMP
M
Misfire
  • Mike3
  • May 30, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
1
Views
89
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 30, 2026
Mike3
M
A
Check Engine codes jumping around
  • azactor
  • Jan 9, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
184
1996 - 2004 SN95 Mustang -General/Talk- Jan 10, 2026
gkomo
T
Need help 67 hazard flashers not working
  • THS70
  • Jan 21, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
15
Views
729
1965 - 1973 Classic Mustangs -General/Talk- Jan 29, 2026
Noobz347
8
Electrical Crank-no start ... no spark ... no injector pulse, was it something I did? (redux)
  • 85gtCOBRA
  • Oct 28, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
554
Fox 5.0 Mustang Tech Oct 29, 2025
85gtCOBRA
8
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?