Where is ground for Oxygen sensors ? - Ford Mustang Forums : Corral.net Mustang Forum
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 07-23-2002, 03:47 PM Thread Starter
Registered User
 
Trader Feedback: (1)
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 1,092
Where is ground for Oxygen sensors ?

IS there suppose to be a ground on the O2 sensor harness? THere are 3 connectors on my harness. 2 are going to the O2 sensors and the othe wire goes to the some sensor in the side of the oil pan... what is that sensor for and what is it called? I took my harness from a 89 GT Mustang in the junkyard. Im trying to figure out why my car is running like a V6 with a rough idle... I dont know if this makes a difference but the braided wire thats on the firewall I have it grounded on the bellhousing bolt on the tranny. and the orange wire coming from the fuel injector harness is grounded on one of the upper intake bolts.


88 LX 5sp
Ported stock intake, GT40P Heads, ASP crank pulley, Ford Motorsport shorty headers, Mac O/R H-pipe, Flowmasters, Tri-ax shifter, King Cobra Clutch
Fastcat is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 07-24-2002, 01:56 PM
 
Trader Feedback: (0)
Join Date: Feb 2001
Posts: 107
The O2 signal ground is the orange wire. Sounds like its connected just fine. The sensor on the oil pan is the oil level sender (triggers idiot light when oil is ~1 quart low).

FuelieStang is offline  
post #3 of 7 Old 07-24-2002, 02:23 PM
 
Trader Feedback: (0)
Join Date: Jun 2000
Posts: 442
The orange wire comming from the Fuel Injector harness is ground for that harness. Orignally it is connected to the drivers side-rear intake bolt. The braided ground strap was connected from the same bolt to the firewall. If the two are not connected together this could cause a poor ground and the engine to run very rich. You can either connect them there, or at one of the bellhousing bolts, as long as they are together.

The oxygen sensors do not have a ground wire. They are ground through the body of the sensor to the h-pipe. The oxygen sensors have 3 wires going to them:

- B+ for O2 heater
- Ground for O2 heater

The heater circuit has nothing to do with how the computer reads the sensors. It is only there to assist the sensors in reaching propper operating temperature.

- B+ to O2 sensor

This is the wire the computer reads for voltage changes and it works on a 0-1v scale.
Blue88Notch is offline  
Sponsored Links
Advertisement
 
post #4 of 7 Old 07-24-2002, 04:45 PM Thread Starter
Registered User
 
Trader Feedback: (1)
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 1,092
MINE are not together.. I have the braided line on bolted on the bellhousng bolt and the orange wire on the intake.... Tomorrow I will put them on the same bolt.. could I have cause some type of damage... I've had it this way for about a month and my car has never ran correctly.... But its just hard to believe 1 wire can cause the type of problem I have... My car runs like a (SLOW) V6 and has a rough idle.

88 LX 5sp
Ported stock intake, GT40P Heads, ASP crank pulley, Ford Motorsport shorty headers, Mac O/R H-pipe, Flowmasters, Tri-ax shifter, King Cobra Clutch
Fastcat is offline  
post #5 of 7 Old 07-24-2002, 04:54 PM
Registered User
 
C. Johnson's Avatar
 
Trader Feedback: (2)
Join Date: Sep 2000
Location: Madison, AL
Posts: 1,394
Fascat,

Hope you get this figured out! I replied several times to your other thread a few days ago. I forgot to add the other day that both of mine were grounded together at the same location. That could make a difference as Blue88Notch suggested.

Good luck
Casey

-- Casey
1989 GT
2009 Mazda Speed 3
2006 Mazda Speed 6 (wife's car)
C. Johnson is offline  
post #6 of 7 Old 07-25-2002, 12:12 AM Thread Starter
Registered User
 
Trader Feedback: (1)
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 1,092
Im gonna ground them in the same spot but it just doesnt seem like grounding 2 wires will make my car run like its suppose too... has anyone else ever had a problem like this?

88 LX 5sp
Ported stock intake, GT40P Heads, ASP crank pulley, Ford Motorsport shorty headers, Mac O/R H-pipe, Flowmasters, Tri-ax shifter, King Cobra Clutch
Fastcat is offline  
post #7 of 7 Old 07-25-2002, 11:41 AM Thread Starter
Registered User
 
Trader Feedback: (1)
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 1,092
tt]

88 LX 5sp
Ported stock intake, GT40P Heads, ASP crank pulley, Ford Motorsport shorty headers, Mac O/R H-pipe, Flowmasters, Tri-ax shifter, King Cobra Clutch
Fastcat is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Starting without tune or calibrated maf. 89blkmustang Turbochargers 21 07-04-2018 07:47 AM
1989 mustang gt randomly shuts off five.zero General Mustang Tech 5 04-10-2013 10:49 PM
For Sale New PLX LED Gauges and Sensors Turbo98 Interior Parts 5 02-03-2012 09:51 PM
Do you paint ground effects then install? '89 DropTop The Body Shop 2 12-04-2001 10:43 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome