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