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Not British Car Related, Oxygen Sensor?

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Toyota uses an "Air/Fuel Ratio", not an Oxy. sensor up front... you are comparing apples to oranges...
 
A Rose by another name..
 
Well, either way, I take issue. There is no computer that allows oxygen sensor control at WOT in any car, including Toyota's Prius. This is to protect the engine from damage due to lean condition. ....and there is a difference in fuel adapt strategy with a Toyota A/F ratio sensor, per se, as opposed to an oxy sensor... It has something to do with short term and long term fuel trim and catalyst efficiency. IIRC
 
Sherman said:
There is no computer that allows oxygen sensor control at WOT in any car, including Toyota's Prius.
Click to expand...
Ok, Sherman, have it your way.

It's true, strictly speaking, that the wide-band sensor isn't an "oxygen sensor". It's much more complicated that that, actually a miniature reaction cell plus an oxygen pump. The output is based on how much current the oxygen pump requires to add or subtract enough oxygen to reach stoichiometric mixture within the cell.

It's also true that "Oxygen sensor" is something of an Americanism, "Lambda sensor" is more common in the rest of the world.

But the functions are the same, and there are a few ECU systems that maintain closed-loop operation at WOT. I expect there will be more in the future as emissions standards (and mpg requirements) get ever tougher.
 
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Love that Graemlin!!

My 1993 GMC Sonoma with 400,000+ miles is having problems starting & gas mileage isn't as good as it once was.

By "having problems starting", I mean that sometimes I have to grind on it a bit to get it going & then it feels like its starved for fuel (just won't go anywhere & has no power at the accelerator no matter how hard I push it)...other times it fires right up with all its old power...sometimes it fires up with no power but after a few moments is back to normal.

I have no clue what anything you guys have said in this thread means...should I change out my oxygen sensor/s?
 
Ahhh Tony your Fratzit is operating incorrectly, hit it with a brass hammer.
 
Well, if the frapulator has excess banana gas, and the canootin valve won't canoot, it means you must wait for a full moon, and do the zulu warrior dance around the truck while a zulu chief sprinkles war mist on the hood while chanting incantations to the car gods!! :crazyeyes:
 
Sherman said:
Well, if the frapulator has excess banana gas, and the canootin valve won't canoot, it means you must wait for a full moon, and do the zulu warrior dance around the truck while a zulu chief sprinkles war mist on the hood while chanting incantations to the car gods!! :crazyeyes:
Click to expand...
Done that already (& have you tried to find a real Zulu warrior lately?)...now, I'm trying to figure out the Greek you guys have been speaking. :devilgrin:
 
You have one of 3 engines available in 1993... 4 cyl... 2.5L, The throttle body 4.3 liter, or the 4.3 with CFI option.... please enlighten me!
 
4.3 liter throttle body.
 
Mine also - replaced them (lifted the bed to get to the pump).
 
So, what is pressure/volume? Just because they are new doesn't mean they aren't defective! do you have a good scope pattern? Next on my list would be the distributor.... look at the magnets after removing the cap, and if there are cracks, you found the culprit. What, if any are your DTC's? Oxy sensor voltage? TPS? Also, a flakey CTS can cause these symptoms.
 
Sherman said:
So, what is pressure/volume? Just because they are new doesn't mean they aren't defective! do you have a good scope pattern? Next on my list would be the distributor.... look at the magnets after removing the cap, and if there are cracks, you found the culprit. What, if any are your DTC's? Oxy sensor voltage? TPS? Also, a flakey CTS can cause these symptoms.
Click to expand...
English, please! Remember, I work on 30+ year-old British cars!
 
Have you retrieved any data trouble codes with a scanner? If so, what do the data stream values show for the coolant temperature sensor? (CTS) Does the Throttle Position Senspr (TPS) show about 1/2 a volt at idle and over 4.5 volts at WOT? If yo do not own a scanner, borrow one... Auto Zone scans for free....
 
Thanks. Maybe that's the next step - a trip to AutoZone....I don't mess with cars that have all that crap on 'em...gimme a simple little MG to work on anyday....these cars/trucks are just a piece of equipment to get a job done!
 
Sounds more like fuel supply than mixture control.

I would check fuel filter, pressure and manifold for leakage(internal) as first line of attack.
 
Ge Tony, with <span style="text-decoration: underline"><span style="font-weight: bold">ONLY</span></span> 400,000 miles on it, I'd write GM and complain!
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In reality, those Chevys are tough, aren't they!
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