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1992 Lumina code 33
White93z34 and one other reacted to 55trucker for a topic
Not sure why you would go to all of this *effort* for a code 12? A failed o2 sensor will do nothing more than prevent the fuel system from going closed loop.2 points -
1992 Lumina code 33
90sEraWhips reacted to White93z34 for a topic
This. There is likely a vacuum leak someplace.1 point -
1992 Lumina code 33
90sEraWhips reacted to 55trucker for a topic
Noooo, a *failed* o2 sensor will prevent the ECM/fuel system from going into closed loop, a *lazy* o2 sensor can cause the ECM to repeatedly enter & exit closed loop upsetting the fuel handling and any other device that operates when the system is in closed loop.1 point -
1992 Lumina code 33
90sEraWhips reacted to Schurkey for a topic
"12" is normal when the engine isn't running. It's telling you that the distributor isn't turning--which is what happens when the engine doesn't run. A failed O2 sensor CAN do more than "prevent closed-loop". It can send false information to the computer generally leading to poor fuel economy and/or poor driveability while in closed-loop. Absolutely, find and fix the vacuum leak(s).1 point -
1992 Lumina code 33
90sEraWhips reacted to 94 olds vert for a topic
A quick google search for code 33 comes up with MAP sensor. That could be related to your vacuum leak. I would fix the hose and see if the issue goes away. Your symptoms sound like a typical vacuum leak.1 point -
3500 top swap?!?
90sEraWhips reacted to rich_e777 for a topic
Ive read that a 3400 is a near direct swap, you might compare the differences between a 3400 and 3500 and go from there. Did the `97 Cutlass Coupe get to full OBD 2?1 point