o2 sensors 87 chevy

01ram4x4

01ram4x4

Well-Known Member
Joined
Jun 29, 2007
Location
roxboro
i just bought an 87 chevy truck 350 with the tbi fuel injection system and the previous owners has long tube headers installed but the cut the wires and removed the o2 sensors does this really effect driveablity or just required to lower emissions lol
 
It's a closed-loop EFI system. Yes, it should hurt performance and, perhaps more importantly, gas mileage. In order for a fuel injection system to perform up to par, it needs to know what's coming OUT of the cylinders. The O2 sensors tell the computer whether or not what it's doing is correct. Put it back. I believe it's only one on that setup. I'm pretty sure mine is installed pre-cat, post Y-pipe.
 
catfishblues said:
It's a closed-loop EFI system. Yes, it should hurt performance and, perhaps more importantly, gas mileage. In order for a fuel injection system to perform up to par, it needs to know what's coming OUT of the cylinders. The O2 sensors tell the computer whether or not what it's doing is correct. Put it back. I believe it's only one on that setup. I'm pretty sure mine is installed pre-cat, post Y-pipe.
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There is only one but IIRC it's on the manifold. At least that's where mine was on my '89. With it or without it, it ran pretty much the same. I ran it with the sensor unlugged on accident and didn't notice any difference. YMMV. My .02. Blah blah blah.:lol:
 
You may or may not notice a difference in performance. I would think the gas mileage would suffer some, as well as some driveability problems. But you may not notice them. Depends on the person and the EFI setup. TBI wasn't exactly complicated. It will probably run just fine forever without it, but the EFI is never going to go into closed loop, which means some of the tables will never be adjusted. And its almost impossible to tune without some kind of O2 sensor....if thats something you want to do later on.
 
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