oxygen sensor???

gebasgt

New Member
Jul 5, 2003
95
0
0
Visit site
My 93 cobra sometimes seems to lag or seems to not respond very well when WOT. Sometime I'll pull strong up to 3500 RPM o so then the power drops off for a second or so then kicks back in and pulls strong. I can't figure out whats causing this. Could it be an oxygen sensor gone bad and its dumping too much fuel? I do know that my car runs rich. Any help would be greatly apprecited. Also have new plugs, rotor and cap and timing set to 14 degrees running 93 octane.
 
  • Sponsors(?)


Foxfan88

My Grandpa has great wood.
Sep 13, 2004
2,487
3
0
32
Miami, Ok
nope, the EEC ignores and doesnt use o2 feedback in WOT mode.

the o2s are used for normal closed loop driving and idling. so an o2 problem will only cause problems when the car is in closed loop (up to temp idling and cruising) and wont cause WOT problems. cold starts dont use the o2s either.
 

gebasgt

New Member
Jul 5, 2003
95
0
0
Visit site
nope, the EEC ignores and doesnt use o2 feedback in WOT mode.

the o2s are used for normal closed loop driving and idling. so an o2 problem will only cause problems when the car is in closed loop (up to temp idling and cruising) and wont cause WOT problems. cold starts dont use the o2s either.
Any suggestions then?
 

joel5.0

New Member
Jun 15, 2004
429
1
0
Puerto Rico
Even though O2s feedback is not used in open loop, bad O2s will affect the corrections learned by the adaptive strategy (updated during close loop operation) the system applies to the open loop calibration tables. Suggest to run the DIY KOEO/KOER self tests to obtain the failure codes that could be causing the problem. LUK
 

5Liter1990

New Member
Jan 8, 2006
8
0
0
Northport, Long Island
Try unpluging the o2 sensors (do this only if you can the check engine light that will come on when you do this) the car will run a little rick but if the problem stops you will know its the o2 sensors. I had the same problem with my jeep. See if that works. I'm not sure about the WOT operation so foxfan might be right.
 

Foxbody93

New Member
Jul 13, 2007
20
0
0
Funny you mention this issue I just posted a thread similar to this. My 93 cobra has the same issue. I removed the under drive pulleys thinking it might be related, but it wasn't. I re-ran the white trigger wire on my MSD ignition since the tech told me this could be an issue. Still no change. I'm now looking at the MAF and Throttle body but need inputs before changing them out.
 

jrichker

StangNet's favorite TOOL
SN Certified Technician
Mar 10, 2000
27,437
2,870
234
74
Dublin GA
lowendmac.com
Dump the codes and see what the computer says is wrong…Codes may be present in the computer even if the Check Engine light isn’t on.

Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great. You watch the flashing test lamp or Check Engine Light and count the flashes.

See http://www.troublecodes.net/Ford/





If your car is an 86-88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 86-88's except possibly the Cali Mass Air cars.



89 through 95 cars have a working Check Engine light. Watch it instead of using a test lamp.



Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.

Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.

For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Wal-Mart.

Or for a nicer scanner see http://www.midwayautosupply.com/pc-7208-90-equus-digital-ford-code-reader-3145.aspx – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $30.
 
Thread starter Similar threads Forum Replies Date
D Oxygen sensor 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
D **HELP NEEDED** O2 PIGTAIL WIRES 1996 - 2004 SN95 Mustang -General/Talk- 2
D O2 sensor harness 1994 - 1995 Specific Tech 0
D Oxygen sensor help 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
Onesick99GT Exhaust Wideband Oxygen Sensors Help Needed SN95 4.6L Mustang Tech 8
K Help P1151 SN95 V6 Mustang Tech 1
fredfifty Exhaust Leak At O2 Bung Fox 5.0 Mustang Tech 33
A Plesae Help With Oxygen Sensor Sorting Out Fox 5.0 Mustang Tech 6
D Emissions Problem - Very High Hc Fox 5.0 Mustang Tech 35
T Please Help O2 Sensor Hookup 5.0 Swap 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
T Engine 2005 V6 Oxygen Sensor / Cel Problem 2005 - 2009 Specific Tech 0
Blown88GT For Sale 2 Bosch Oxygen Sensors, Nib Engine and Power Adder 3
des89stang SOLD 87-93 Denso Oxygen Sensors, Nib. Other Classifieds 4
Luis911 Electrical I Had Code 92, Exchanged Oxygen Sensors, Now Code 42 (update Now Code 44 And 94) Fox 5.0 Mustang Tech 7
Blown88GT SOLD 2 Bosch Oxygen Sensors, Nib Engine and Power Adder 11
L Changing Front Oxygen Sensors SN95 4.6L Mustang Tech 5
L Oxygen Sensor Clean Up SN95 4.6L Mustang Tech 0
Luis911 Engine Useful Life Of The Oxygen Sensor Fox 5.0 Mustang Tech 6
M Removing Oxygen Sensor Questions 1994 - 1995 Specific Tech 3
J 95 3.6L V6- Oxygen Sensor SN95 V6 Mustang Tech 3
8 oxygen sensor socket SN95 4.6L Mustang Tech 5
93lxtwin Oxygen sensors Fox 5.0 Mustang Tech 9
90silverstang Running Rich,A9M ECU and Oxygen Sensor question Fox 5.0 Mustang Tech 13
arnie93lx 87-93 M/T oxygen sensor harness Engine and Power Adder 1
R WILL 2001 gt oxygen sensors work in my 96 GT SN95 4.6L Mustang Tech 1
Tripoli Upstream Oxygen Sensors - On with open loop tune? SN95 4.6L Mustang Tech 8
I upstream vs downstream oxygen sensor 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
hollywoodstang oxygen sensors and off-road H pipe 1994 - 1995 Specific Tech 16
J oxygen sensors SN95 4.6L Mustang Tech 5
M 99 cobra oxygen sensor harness SVT Tech Forum 2
FoxRod87 oxygen sensors SN95 4.6L Mustang Tech 5
Hi-Po Oxygen sensors - Code 41 Fox 5.0 Mustang Tech 2
babybudistmonk Oxygen Sensors 2.3L (N/A & Turbo) Tech 3
M oxygen sensor wiring-92 2.3L (N/A & Turbo) Tech 2
tx65coupe 1997 Cobra Oxygen Sensors SVT Tech Forum 2
C Tell Me If I'm Crazy. Oxygen Sensors SN95 4.6L Mustang Tech 17
V oxygen sensors question on a 97 4.6L V8 SOHC -which one goes where? SN95 4.6L Mustang Tech 0
V oxygen sensors on a 97 4.6L V8 SOHC -which one goes where? 1996 - 2004 SN95 Mustang -General/Talk- 2
blackstangt 4th wire on oxygen sensor harness. Fox 5.0 Mustang Tech 2
Blk91stang Checking Power to Oxygen Sensors?? How?? Fox 5.0 Mustang Tech 2
N Oxygen sensor question Fox 5.0 Mustang Tech 10
Quick Pony Oxygen Sensor Removal?? Fox 5.0 Mustang Tech 10
Chowder Head Does anyone have experience with this oxygen sensor kit? Fox 5.0 Mustang Tech 3
Quick Pony Oxygen Sensors ? Fox 5.0 Mustang Tech 3
chr1s11575stang Oxygen Sensors??? Fox 5.0 Mustang Tech 9
I Installed BBK longtube headers and engine runs better without oxygen sensors!!! Fox 5.0 Mustang Tech 8
Dean85GT Oxygen sensor bung thread size? Fox 5.0 Mustang Tech 2
P Oxygen Sensor Wires Backwards? Classic Mustang Specific Tech 3
stevesLX oxygen sensor wiring Fox 5.0 Mustang Tech 6
F Oxygen Sensor Signal Wire Fox 5.0 Mustang Tech 5
Similar threads