93 Lt1 troubleshooting help
Thread Starter
1st Gear
Joined: Apr 2019
Posts: 1
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93 Lt1 troubleshooting help
bought a 93 base model about two months ago. only work done to it so far is having the exhaust pipes reclamped and welded because they were loose. my issue is that the car runs decent but will randomly die while driving and crank back up and drive again after resting for a minute or two. error codes are 13 and 63 which are o2 sensor related and 72 which is vss signal circuit error (to the best of my knowledge). some of the research i've done leads me to believe there may be an optispark issue but i'm not 100% sure. new to the corvette world
Race Director
Joined: Oct 2011
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From: Dallas Texas
2025 C4 of the Year Finalist - Modified
I'd get the car hooked up to a scanner that shows real time data. I'd be checking to see what the o2 sensor readings are. They should swing between 100mv-999mv quickly, in closed loop. Never heard of o2's causing stalling, but if they aren't reading correct, or slow to respond, then I'd fix that. And go from there.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
DTC 13 – Bank 1Left Front) Heated Oxygen} Oxygen Sensor (H02S) #1 Circuit (Open Circuit)
DTC 63 – Bank 2 (Right Front) Heated Oxygen Sensor (HO2S) #1 Circuit (Open Circuit)
DTC 72 – Vehicle Speed Sensor Loss
Seems odd both front O2 sensors having issues at the same time. I would lean more to a possible intermittent issue with the ECM.
DTC 63 – Bank 2 (Right Front) Heated Oxygen Sensor (HO2S) #1 Circuit (Open Circuit)
DTC 72 – Vehicle Speed Sensor Loss
Seems odd both front O2 sensors having issues at the same time. I would lean more to a possible intermittent issue with the ECM.
Melting Slicks
Joined: Feb 2003
Posts: 2,677
Likes: 812
From: Saskatoon Sask.
Well, the 93 uses the same ECM as the 92. If you have been reading any threads about this ECM for the past few years, you would know that this ECM is next to impossible to attain. Not quite sure what your picture has to do with attaining one of those.
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