how do i test all my sensors for my 91 t.pi?

why isnt there a sticky for this??

should i just buy all new sensors,, so i dont go crazy when i start up my new motor and cant track the problems

 

Did your sensors not work prior to you working on your motor?

IF you have problems when you start the motor back up, you can find out which sensor is giving you a problem by reading the code your computer throws. To do this, read my response in this thread

ALDL Explained

Once you find out the number of your code, look it up online to see which sensor is faulty.

 

thanks,,, i really have no clue what ones worked or not,, because i bought a car with a junk motor,,,, i dont really even know if all the wiring will be there!!! and i kinda broke the knock sensor but not completly

 

Start it and see if you get codes. Below are a few simple sensor checks:

Check coolant and air temperature sensors with an ohmmeter. They are thermisters and should have high resistance when cold and low resistance when hot.

Check TPS with an analog ohmmeter. Resistance should vary linearly as the throttle is opened without any momentary open circuits, which are characteristic of a burnt spot. You will get high-to-low or low-to-high resistance depending on which terminals you check with.

Check knock sensor using a scan tool and a screwdriver. While watching the scan tool, tap on the side of the block adjacent to the knock sensor and see if knock is signalled.

Check map sensor with an ohmmeter and a hand vacuum pump. Resistance should change with vacuum.

 

I somehow agree with Pennock.

I've been saying for some time now that we should have a sticky or at least an article on testing sensors and troubleshooting common systems (like el. fans, fuel pump etc).

Once I have some free time, I'll try to write up something.

Lou