OBD1 Error codes O2 sensors and Fan - Ford Mustang Forum
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post #1 of 8 (permalink) Old 3 Weeks Ago Thread Starter
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KOEO I get a 564 which says it’s a electro drive fan circuit fault. Well the electric fan comes on so I don’t know what that’s about.
I also got codes 137, “O2 sensor always rich,” and 173 “O2 sensor fault/rich.”
Do y’all think it’s bad sensors or something upstream? The exhaust has a funny smell to it, but it doesn’t really smell like fuel.

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post #2 of 8 (permalink) Old 3 Weeks Ago Thread Starter
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I got an 80 which means cylinder 8. Ignition problem I think maybe??? The fuel injectors are pretty new.
*Edit*
I ran the balance test again. This time it said cylinder 3. I guess I need to pull plugs and take a look. Would fouled plugs cause O2 sensor codes? It’s not misfiring though and will accelerate through the rpm range.

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I ran the cylinder balance test a few more times and it gave different results each time. Once it said cylinder three, once it said cylinder 8 and “all good” in the same test, and the last balance test said “all good.” I pulled spark plug number three and there was a little oil on the threads.
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post #4 of 8 (permalink) Old 3 Weeks Ago
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When you ran the cylinder balance test is this one after eachother or with a key cycle? Does sound like an ignition problem if raw fuel is making it to the O2's

90 LX 5.0 5spd
FTI TW 11R 170cc --- Custom Cam Soon....
Ported 93 Cobra Intake Manifold -- BBK 75mm TB
FRPP shorties -- BBK O/R X
Spintech Prostreets -- 2.5in Flowmaster Tails
Hurst Billet Plus Shifter -- BBK CAI
FRPP 3.73s -- Walbro 190lph
3G alt -- Contour Fans -- '92 Premium Radio w/ EQ
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Quote:
Originally Posted by Krem12 View Post
When you ran the cylinder balance test is this one after eachother or with a key cycle? Does sound like an ignition problem if raw fuel is making it to the O2's
With a key cycle. With an extend amount of time between.
If it’s an ignition problem what would be the first suspect? Coil, cap, or plugs?
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post #6 of 8 (permalink) Old 2 Weeks Ago
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With a key cycle. With an extend amount of time between.
If it’s an ignition problem what would be the first suspect? Coil, cap, or plugs?
Hmm not to sure. I wish we could see a crank position display with our computer just so you could rule that out.

If you can get the coil load tested that would be where I would start. If it was the cap and plug I think you wouldnt see a random factor to it.

90 LX 5.0 5spd
FTI TW 11R 170cc --- Custom Cam Soon....
Ported 93 Cobra Intake Manifold -- BBK 75mm TB
FRPP shorties -- BBK O/R X
Spintech Prostreets -- 2.5in Flowmaster Tails
Hurst Billet Plus Shifter -- BBK CAI
FRPP 3.73s -- Walbro 190lph
3G alt -- Contour Fans -- '92 Premium Radio w/ EQ
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post #7 of 8 (permalink) Old 2 Weeks Ago Thread Starter
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Quote:
Originally Posted by Krem12 View Post
Quote:
Originally Posted by 90lxwhite View Post
With a key cycle. With an extend amount of time between.
If it’s an ignition problem what would be the first suspect? Coil, cap, or plugs?
Hmm not to sure. I wish we could see a crank position display with our computer just so you could rule that out.

If you can get the coil load tested that would be where I would start. If it was the cap and plug I think you wouldnt see a random factor to it.
Our computers are fairly whack as far as “telling us stuff” goes.
I wanna new Stang.. An ‘18 Auto would be nice.
In other news, the local grocery store is almost out of toilet paper.
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post #8 of 8 (permalink) Old 2 Weeks Ago
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Quote:
Originally Posted by 90lxwhite View Post
Our computers are fairly whack as far as “telling us stuff” goes.
I wanna new Stang.. An ‘18 Auto would be nice.
In other news, the local grocery store is almost out of toilet paper.
Lol thats too funny

90 LX 5.0 5spd
FTI TW 11R 170cc --- Custom Cam Soon....
Ported 93 Cobra Intake Manifold -- BBK 75mm TB
FRPP shorties -- BBK O/R X
Spintech Prostreets -- 2.5in Flowmaster Tails
Hurst Billet Plus Shifter -- BBK CAI
FRPP 3.73s -- Walbro 190lph
3G alt -- Contour Fans -- '92 Premium Radio w/ EQ
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