hey guys, ive been having issues with my foxbody

[(NW)Drake]

these are the code i have been reading as of today. i will reset them after im done posting this, the only KOEO test code is DTC 11. DTC 33, 41 and 66 are CM. The Following are KOER test DTC12, 21, 41, 91, 33, 18.

 

[sdsubzero4]

O2 sensors going bad?

 

[(NW)Drake]

O2 sensors going bad?

replaced them multiple times now. and as E had mentioned before that his had a common ground wire, mine do not they are grounded thru the exhaust

(EDIT)
The O2s them selves are grounded thru the exhaust, and the computer has a separate ground, here is the link that i found this out at

http://www.stangnet.com/mustang-forums/threads/engine-ground-locations.791485/

 

[(NW)Drake]

im sure that this has been posted many times, http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

but here it is again, any input on my situation plz post up. and i will do it in the morning when i have light.

 

[wickedstangs]

For Code 33 you need to replace your EVR that fixed my code 33

 

[wickedstangs]

For my Code 41 / 91 I did the below... Turnout to be my 19 wire not in the right position..
41 - System Indicates Lean -passenger side(R), No O2 Sensor Switching Detected. always lean -passenger side(CM)
91 - System Indicates Lean -driver side(R), No O2 Sensor Switching Detected. always lean -driver side(CM)

For Code 41 and 91 do a continuity test from pin 49 at the ECM connector, ECM disconnected, to a good ground source, the resistance reading should be equal/less than 5 ohms



Codes 41/91 (Lean Condition) specific tests:
For codes 41/91 (lean condition), it is always recommended to check the condition of the HEGO GND circuit (pin 49 at ECM connector), a bad/open ground circuit will cause lean readings from the O2 sensors. The HEGO GND is an Orange wire, with a ring connector, that goes bolted to the back of the driver side cylinder head. Identified as item #19 in the following harness diagram.

'86-'93 O2 sensors are 3-wire setups, eventhough the following chart shows a 4-wire setup, the tests can be performed as specified. 3-wire sensors DO NOT use a SIG RTN circuit....

 

[(NW)Drake]

cool thx E, ill do it first thing tomorrow and ill let u know what shows up

 

[wickedstangs]

This is where I found my #19 HEGO Ground in the wrong place..

 

[wickedstangs]

Fix the above first and the rest should clear... Keep me posted...

replaced them multiple times now. and as E had mentioned before that his had a common ground wire, mine do not they are grounded thru the exhaust

(EDIT)
The O2s them selves are grounded thru the exhaust, and the computer has a separate ground, here is the link that i found this out at

The exhaust is not a good ground... The orange wire should go to the block, thats what I did...

 

[(NW)Drake]

on my multi meter i have it set at 200ohms and i get a 1.0 reading on a known good ground.

 

[wickedstangs]

on my multi meter i have it set at 200ohms and i get a 1.0 reading on a known good ground.

post a pic of your multimeter.. to me that looks high/bad..

 

[(NW)Drake]

 

[wickedstangs]

View attachment 3156

Call me..

 

[(NW)Drake]

So I moved the orange wire to a known good ground still the same codes... possible mechanical or the brain?

 

[yosemiddysam]

Just out of curiosity does the car have an aftermarket Cam?

 

[(NW)Drake]

Nope all stock except for k&n, msd cap, rotor and wires, msd2 blaster coil. And I have auto lite iridium plugs

 

[(NW)Drake]

Ok guys I think I have non stock injectors... after looking at http://www.veryuseful.com/mustang/tech/engine/images/Ford_Injector_Guide.jpg my injectors are not orange they are black and I haven't looked very close seeing as how its dark out I will tomorrow. If I don't have stock injectors will I need a tune and or new maf?

"Edit" I will post pics of the injectors I can see tomorrow.

 

[wickedstangs]

if you do not have the right mass calibrated to your injectors to can have all sorts of issues.. Post up on your find..

 

[(NW)Drake]

http://www.corral.net/tech/maintenance/eecivtest-balance.html

i got code 90 so my injectors are good, and my cylinders are good and i have 19lb injectors

and this is how to do a koer test and a cylinder balance test

 

[(NW)Drake]

These are the codes I'm getting now