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Username Post: Code 13... O2 sensor        (Topic#349082)
Ralph0000001 
Forum Newbie
Posts: 5

Reg: 01-09-18
01-09-18 07:24 AM - Post#2720537    

Have a code 13... open circuit O2 sensor... is 3 wire upstream... changed sensor... and cleared by disconnecting -cable on battery while changing sensor... still have code 13 coming up... ? Anyone have idea what's wrong?

1994 Chevy 4x4 standard 4spd cast iron... 6 bolt wheels... was a 6 cyl... bought it with a 305... put a 95 5.7L in her...


 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3940
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-09-18 07:42 AM - Post#2720540    
    In response to Ralph0000001

Welcome to ChevyTalk, Ralph.

Just as a quick housekeeping suggestion, it is wise to add your truck information in your signature space. Truck year, model, engine, and transmission info. Also, is your truck stock?

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3940
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-09-18 07:50 AM - Post#2720541    
    In response to CowboyTrukr

First verify you have 12V at the plug. If you do, then you’ll need to trace the output lead wire back and make sure there’s continuity to the computer. The sensor has power, a ground, and the signal lead.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
Shepherd 
Frequent Contributor
Posts: 1285

Loc: Lake George, NY
Reg: 11-11-15
01-09-18 08:50 AM - Post#2720548    
    In response to CowboyTrukr

Agreed, good info



 
Ralph0000001 
Forum Newbie
Posts: 5

Reg: 01-09-18
01-09-18 11:20 AM - Post#2720565    
    In response to CowboyTrukr

Great... I'll get on that as soon as the big storm is over... thank you 👍✌

1994 Chevy 4x4 standard 4spd cast iron... 6 bolt wheels... was a 6 cyl... bought it with a 305... put a 95 5.7L in her...


 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3940
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-10-18 12:30 AM - Post#2720648    
    In response to Ralph0000001

Actually, Ralph, I forgot to clarify: You may have a 3 wire sensor with a built in heater feed.

If yours in only a single wire one, then you only have the 1 wire to trace, obviously.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
Ralph0000001 
Forum Newbie
Posts: 5

Reg: 01-09-18
01-11-18 09:31 AM - Post#2720773    
    In response to CowboyTrukr

Ok... New sensor... checked plug for 12v and ground are good readings... wire from plug to computer plug behind glove box has good continuity... everything checks out as you requested... still have code 13... open circuit O2 sensor... ????

1994 Chevy 4x4 standard 4spd cast iron... 6 bolt wheels... was a 6 cyl... bought it with a 305... put a 95 5.7L in her...


Edited by Ralph0000001 on 01-11-18 09:33 AM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 1285

Loc: Lake George, NY
Reg: 11-11-15
01-11-18 09:43 AM - Post#2720774    
    In response to Ralph0000001

Did you clear the code? Drive it and it came back?



 
Ralph0000001 
Forum Newbie
Posts: 5

Reg: 01-09-18
01-11-18 11:42 AM - Post#2720782    
    In response to Shepherd

Yes... cleared the code... after running for only a few mins the light came on again... so turned the truck off... and checked codes... same one code 13... I use to have a code 14 also... engine temp sensor... changed it and the code is gone...

1994 Chevy 4x4 standard 4spd cast iron... 6 bolt wheels... was a 6 cyl... bought it with a 305... put a 95 5.7L in her...


Edited by Ralph0000001 on 01-11-18 11:47 AM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 1285

Loc: Lake George, NY
Reg: 11-11-15
01-11-18 11:53 AM - Post#2720785    
    In response to Ralph0000001

At this point you should get a scanner on it and look at sensor activity, see if it is switching as designed. What year is it?



 
Ralph0000001 
Forum Newbie
Posts: 5

Reg: 01-09-18
01-11-18 04:37 PM - Post#2720802    
    In response to Shepherd

It's a 94 chev 1/2 ton standard 4 speed with bull low... originally had a 6 cycl... bought it with a 305, bought it from a mechanic... can't remember if dash had a light on or not then... 305 died, put a 350 in it... garage done it... this fall it started to fluctuate at idle and lately start to hesitate driving... disconnected O2 sensor, no fluctuations and no hesitation... code 13 and 14 came up... fixed 14... 13 still there after changing sensor and the trouble shooting as suggested... hope this helps...

1994 Chevy 4x4 standard 4spd cast iron... 6 bolt wheels... was a 6 cyl... bought it with a 305... put a 95 5.7L in her...


 
Shepherd 
Frequent Contributor
Posts: 1285

Loc: Lake George, NY
Reg: 11-11-15
01-11-18 05:56 PM - Post#2720812    
    In response to Ralph0000001

That info may finally help, you need to check for the proper ecu/,pcm. Research the right part numbers, see if the engine matches the pcm. Now that maybe the transitional Obd 1.5 in 94, if not it may have a prom in the ecu that can be changed to match that engine. Gonna have to do some backround research here. Lotta changes were done.



 
bowtie44s 
Valued Contributor
Posts: 3928
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
01-11-18 06:49 PM - Post#2720818    
    In response to Ralph0000001

It's hard to tell what you have. The last year for the SM465 4spd was 1991. Someone probably pulled the motor and transmission out of an older truck. I would bet Shepherd is right and you have the wrong ecm.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3940
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-12-18 11:26 PM - Post#2720910    
    In response to bowtie44s

OBD 1.5 was only an S10 thing in '95 if I remember correctly. The C/K series was straight OBD1 until '96.

Make sure you have the computer and PROM chip that came with the '94 5.7.

Shouldn't be an issue as far as the O2 sensor is concerned, but it makes a difference how the computer treats things.

As Shepherd said, it's time to get a scanning code reader or a laptop, OBD1 USB cable, and a decent program like TunerPro to watch what's going on.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
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