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Post Info TOPIC: 94 k1500 obd1 code 13- o2 sensor open loop


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94 k1500 obd1 code 13- o2 sensor open loop


I have ran check on grounds..and checked w a voltmeter to see if getting voltage to the 02 sensor. all passed the test but the motor still throws a code 13 immediately when starting the truck. it runs like its pulling a load of bricks behind it...so bad that in 4 low with the pedal to the floor it wont climb a hill! exhaust glowing cherry red and truck dies when taking curbs too quick..i have not tried a new ecm but would that cause this? its drinking fuel and the most u can get is 45 mph unless u climb any hill..i have put 2 new bosch sensors in it to no avail....im ready to pull all the injection crap off of it and do a carb swap!!!also put new coolant temp switch in too...



-- Edited by backyard71nova on Thursday 5th of January 2017 09:18:22 PM



-- Edited by backyard71nova on Thursday 5th of January 2017 09:19:07 PM

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I had the same problem with a Dodge Van years ago. Turned out it was a clogged catalytic convertor..Truck started getting slower and slower until It wouldn't hardly go over a bridge I had to cross! Replaced it and truck ran fine.

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Yup sounds like the cat is plugged up.

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heres the thing...no catalytic converter and the exhaust goes to a super 44 flowmaster

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Sounds like your running rich. You could try the ECU if you have a spare one. You could also try the throttle body if you have one.

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I'm thinking ecm is out...only thing I can figure...if I cant fix it I'm gonna switch to carburetor and stock hei

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Yeah did that a couple years ago on my 88 k1500.

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how did it do as far as power and driveability?

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Starts a lot better. And sounds better. But never really got to try it more then that. I have about a 100 mile round trip on it.
then started to restore it.

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today it almost died going into 3rd gear...backfire then back to poor sluggish self..i swear it feels like its dragging a semi behind it...


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How's the timing on it ?what about the ignition system. That sounds weird?? I wish I could see it in person. I could probably figure that out in no time.

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I would have sworn it was the cat, but you don't have one. If it backfiring its fuel or timing, you didn't happen to pit new plugs and wires on it lately, wonder if a wires crossed. I know I'm reachin here but couldnthe distributor be worn out?



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rick



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I had a stock HEI go bad..it froze and wouldn't advance...car ran real slow..no power!

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With it being a throttle body I would think the timing would be crucial.



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rick



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Did you figure this out yet?

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