O2 sensors and spark plugs

[1994xlt]

Gonna replace the 02 sensors and spark plugs in my truck tomarrow were are the sensors located and while I replace the o2 sensor is there any signs that would lead to show a problem with them or a color that could tell me how the engine is running

 

[rumblecloud]

Not really any signs on the O2s. The tips will generally be blackish or blue. They might be a bit hard to get loose, just take your time and keep after it. They are easy to find. Passenger side of the Y below the exhaust manifold coupling as I recall. The other is on the opposite side. Let us know how it goes. If I can find an image, i'll post it up.


EDIT: Here's an image of the headers I purchased for mine that shows the location where the O2s go. Should be in the same area on your standard Y. Pay no attention to the circled item.

 

[lil_Blue_Ford]

Not really any signs on the O2s. The tips will generally be blackish or blue. They might be a bit hard to get loose, just take your time and keep after it. They are easy to find. Passenger side of the Y below the exhaust manifold coupling as I recall. The other is on the opposite side. Let us know how it goes. If I can find an image, i'll post it up.


EDIT: Here's an image of the headers I purchased for mine that shows the location where the O2s go. Should be in the same area on your standard Y. Pay no attention to the circled item.

Where’s your image? Lol

 

[pentode]

That's a '94 you're working on? If so that must be an OBD-I / EEC-IV computer right? I'll defer to those who know what data you can get out of those and the availability of a proper scanner. Without those tools though, you still should be able to probe the signal wire on the O2 sensor with a meter and see the voltage level switching (once the truck is warmed up) between 0-1V. I don't know how many sensors that truck has but ones at the front of the exhaust system should switch quickly, downstream sensor voltage should move slowly.

 

[1994xlt]

That's a '94 you're working on? If so that must be an OBD-I / EEC-IV computer right? I'll defer to those who know what data you can get out of those and the availability of a proper scanner. Without those tools though, you still should be able to probe the signal wire on the O2 sensor with a meter and see the voltage level switching (once the truck is warmed up) between 0-1V. I don't know how many sensors that truck has but ones at the front of the exhaust system should switch quickly, downstream sensor voltage should move slowly.

Ok thank you

 

[1994xlt]

Not really any signs on the O2s. The tips will generally be blackish or blue. They might be a bit hard to get loose, just take your time and keep after it. They are easy to find. Passenger side of the Y below the exhaust manifold coupling as I recall. The other is on the opposite side. Let us know how it goes. If I can find an image, i'll post it up.


EDIT: Here's an image of the headers I purchased for mine that shows the location where the O2s go. Should be in the same area on your standard Y. Pay no attention to the circled item.

Ok thank you

 

[mperry]

Follow the exhaust. You'll find the #1 O2 sensor before the cat. #2, if equipped, will be near the back of the cat on the exhaust. I picked up an OBD1 scanner for $35. I wouldn't necessarily replace O2 sensors unless the scanner shows a fault code. (Your check engine light should also be on.) #2 sensor doesn't affect the engine's running, just there to see if the cat is working. #1 is the one that gives feedback to the engine.

Even if it's showing an O2 sensor error that doesn't necessarily mean the sensor(s) are bad. i.e. #2 could be a bad cat or an exhaust leak, #1 any number of problems with the engine. If you do replace, go with quality. Ebay sells $8 no-name sensors, while Bosch will set you back $50 to $60 each. A sensor that gives faults isn't worth the savings.

 

[1994xlt]

Y

Follow the exhaust. You'll find the #1 O2 sensor before the cat. #2, if equipped, will be near the back of the cat on the exhaust. I picked up an OBD1 scanner for $35. I wouldn't necessarily replace O2 sensors unless the scanner shows a fault code. (Your check engine light should also be on.) #2 sensor doesn't affect the engine's running, just there to see if the cat is working. #1 is the one that gives feedback to the engine.

Even if it's showing an O2 sensor error that doesn't necessarily mean the sensor(s) are bad. i.e. #2 could be a bad cat or an exhaust leak, #1 any number of problems with the engine. If you do replace, go with quality. Ebay sells $8 no-name sensors, while Bosch will set you back $50 to $60 each. A sensor that gives faults isn't worth the savings.

yup I got Bosch o2 sensors

 

[SenorNoob]

How'd it go?

 

[1994xlt]

How'd it go?

Welll I got the sensors in had to put a idle air control in as well it was sounding cammed when idleing and in the process realized were the coolant leak I have is going, apparently the more I drive the worse it’s getting, 2-3 weeks ago I noticed “hey my coolant overflow tank is empty, so I filled it up and boom, 2 days later it’s empty so I just kinda ignored it and then last weekend filled it up again and then this weekend I was changing my sensors and the second I got under the truck it was covered in coolant EVERYWHERE but the truck is running fine, now I changed sensors and stuff and now it’s dripping coolant drips now anyways I took it out to my girlfriends house last night and her dad has this inspection camera and it’s really wet around the heads witch means head gasket so I filled my coolant overflow back up again and drove it home and I got home last night and it was dark out so I took the picture this morning but the drivers wheel well has coolant on it as well now, this has to be a hose or a combination of things no way is it just a head gasket if it even is that, I am taking it to the shop tomarrow to have a diagnostic done

 

[1994xlt]

the front axle beam is green and so is a lot of other areas on the motor

 

[rumblecloud]

See if you can wash it down to figure out where it's coming from. It may not be as bad as you think.

 

[1994xlt]

See if you can wash it down to figure out where it's coming from. It may not be as bad as you think.

Okay. Thank you

 

[SenorNoob]

I've had mine leak like that only when running because a hose clamp was slightly loose on the lower water pump to radiator connection. Another time only when running because the little tag the parts store used to hang the hose was too far down. It actually sprayed when running and warm.

 

[1994xlt]

I've had mine leak like that only when running because a hose clamp was slightly loose on the lower water pump to radiator connection. Another time only when running because the little tag the parts store used to hang the hose was too far down. It actually sprayed when running and warm.

Well mine I just started up and it’s dripping down the side of the block by underneath the exhaust manifold