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What were your symptoms of your bad O2 sensor? Any codes?
I had code 172 which is a lean code, and the truck was running really rich and really rough. I don’t know that the O2 sensor was bad, but I figured it was due to be replaced anyways, and that running rich will also mess them up so I replaced it
Rla2005 - doesn't look too bad but that doesn't necessarily mean it's good on the inside. The plug on the new one is the same but the o2 sensor looks different. Do you know if that makes much difference? I doubt it but still.
I believe the one they sold me is a downstream sensor. I'll have to go sort this out. Down stream sensors look thinner structurally and the sensor itself obviously looks different. So I believe they gave me a downstream sensor. I'll let you know what I figure out.
The one on the left looks like a Bosch sensor while the one on the right is from NTK. There is no downstream sensor for a ‘94 so there wouldn’t even be a listing for one.
The one on the left looks like a Bosch sensor while the one on the right is from NTK. There is no downstream sensor for a ‘94 so there wouldn’t even be a listing for one.
This is correct but when you look up the two different style sensors one is downstream. I know they didn't put one on the 1994 ford f250s with the 460 or anything like that but some earlier model f150s had one. My friend's friend hollowed out his cat and ended up melting one of his pistons because it ran too lean, and there was an O2 sensor before and after the cat. Either way I went and exchanged the other one for one of the same style.
The new one in the picture is a BOSCH Premium Oxygen Sensor. Part #: 15717 at NAPA
So of course the O2 sensor change didn't fix it. Worth a try, say the least. Anyone have any more ideas on what I could test/pull to look at or whatever? I know that I should pull and open up the ECM and inspect for damage but I would like to know any other options if anyone has any suggestions. Check engine light doesn't come on but keep in mind, with KOER I get code 173, O2 sensor reading rich condition.
Rla2005, if you're still following this thread then your input is much appreciated. Also, which computer would you suggest I pull? PCM controls injector timing for air fuel ratio and ECM controls pretty much everything else.
This is correct but when you look up the two different style sensors one is downstream. I know they didn't put one on the 1994 ford f250s with the 460 or anything like that but some earlier model f150s had one. My friend's friend hollowed out his cat and ended up melting one of his pistons.
I don’t know about that. I have seen on here that people claim the later models came with the Bosch sensor from the factory. My ‘87 Bronco and ‘89 F-150 both had the NTK style. None of the OBD-I trucks had a downstream sensor. I’m basing that on the fact that when I had the ‘94 Bronco which was mass air also only had the one upstream sensor.
If your friend’s friend hollowed out the converter of an OBD-II it would have set a converter efficiency code. There is more to that story that I feel is missing. Even in that system, the upstream oxygen sensor along with other engine sensors are what tells the computer how to set fuel injector dwell times.
Originally Posted by Jacinth_Morris
Also, which computer would you suggest I pull? PCM controls injector timing for air fuel ratio and ECM controls pretty much everything else.
There is only one computer located by the driver’s left foot that controls engine and if applicable transmission functions.
did you disconnect the battery when you changed the o2 sensor? I’ve heard you need to do that so the computer doesn’t think the old sensor is still in there
Also, which computer would you suggest I pull? PCM controls injector timing for air fuel ratio and ECM controls pretty much everything else.
As noted by another post there is only one computer, Powertrain Control Module (PCM). When you have an E4OD or 4R70S transmision the PCM controls the engine and transmission. With a manual transmission/C6/AOD the computer controls only the engine.
As noted by another post there is only one computer, Powertrain Control Module (PCM). When you have an E4OD or 4R70S transmision the PCM controls the engine and transmission. With a manual transmission/C6/AOD the computer controls only the engine.
Yeah, you're right. Only one computer. I was looking at the other large harness that is for the volumn controls and whatnot
This is a picture I found on Google so credit to whoever
My 93 truck, out of the blue one day, had a bad idle and accelerated like it had water in the gas. I pulled the PCM to discover I had the dreaded capacitor failure inside. I replaced the capacitors and all has been good for the next 7 years.
More recently, my 97 HD 250 was getting an occasional lean code and a stuttering acceleration from a stop. Could not figure it out after testing nearly everything I could. Come to find out it still had the original O2 sensor which was at 212000.
After replacing, the lean code and the stuttering never came back. My 97 HD is a federal truck but it took the California version of o2 sensor. What a hodge podge of left over parts Ford threw at the last OBS trucks.
My 93 truck, out of the blue one day, had a bad idle and accelerated like it had water in the gas. I pulled the PCM to discover I had the dreaded capacitor failure inside. I replaced the capacitors and all has been good for the next 7 years.
More recently, my 97 HD 250 was getting an occasional lean code and a stuttering acceleration from a stop. Could not figure it out after testing nearly everything I could. Come to find out it still had the original O2 sensor which was at 212000.
After replacing, the lean code and the stuttering never came back. My 97 HD is a federal truck but it took the California version of o2 sensor. What a hodge podge of left over parts Ford threw at the last OBS trucks.
Yeah. Whenever I get the chance I'm going to pull the computer to see how it looks. I went outside around 7 AM this morning ready to pull it out and I heard thunder and the sky was turning dark. Rained all day. These are the times I wish I had a shop.
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