Coolant temp sensor location for ECM not Gauge (2 Viewers)

[MKTSC]

I purchased a coolant temp sensor for my '94 due to a stumble the truck has while warming up. I didn't realize there were two, a one wire sender for the gauge, and a two-wire one that talks to the ECM. I have the two-wire sensor for the ECM, but don't know where that sensor is located. FSM isn't very specific, and I don't want to pull the wrong sensor.

I know the gauge sender is directly above and to the left of the oil filter, does someone have a picture of the location of the 2-wire one?

Thanks in advance,

-MK

p.s. I did a search and all the threads are for the gauge sender...

 

[OGBeno]

Front of head, DS. Under intake manifold. ECT for EFI.

 

[MKTSC]

So to the right of the oil filter? One of those two sensors is a knock sensor correct?

Is it like the gauge sender in that you loose a bit of coolant, but don't have to completely drain?

Thanks

-MK

 

[MINO]

I'm doing the same sensor. Here's where it is for future reference.

 

[NOAH8MUD]

Did replacing the sensor resolve the stumble? I'm having the same stumble with a P0116 code for the coolant temp sensor but wasn't sure if it is related.

 

[ajax1]

Yea if you have code for that I'd change it

 

[jkdowty]

I'm guessing this is for the 1fz and NOT the 3fe? Because both my temp sensors are right in or by the thermostat housing/neck...

 

[NOAH8MUD]

Just picked it up from the dealer this morning. I'm really hoping its related and it fixes the stumble. From what I've read on the forum it can be a pain to track down.

 

[wlittleman]

I just changed mine out with the hopes of fixing the cold engine stumble. Unfortunately, it did not.

I have a 93, obd1 like a 94, and no check engine light. Been trying to chase the stumble for a year, and am about to give up and take it into the shop. I found an exposed wire in the engine harness near the EGR, but I've wrapped it up. It's still a possibility that this is what is causing the cold engine stumble.

 

[NOAH8MUD]

I replaced it last night and it fixed it. I don't know why is would be related but it fixed it instantly. I had P0116 code and it's a 97. I don't know if that makes any difference.

 

[DirtyLawyer]

I replaced it last night and it fixed it. I don't know why is would be related but it fixed it instantly. I had P0116 code and it's a 97. I don't know if that makes any difference.

Do you have the Part Number? I have same issue and code. Thanks!

EDIT: part number is 89422-35010, and also recommend new gasket 90430-12005

 

[willscar]

I'm doing the same sensor. Here's where it is for future reference.
View attachment 606018

We’re you able to remove the ECT sensor without removing the intake?

 

[ajax1]

Yes unplug it then use deep socket on it, or wrench

 

[Cruisin94]

I replaced it last night and it fixed it. I don't know why is would be related but it fixed it instantly. I had P0116 code and it's a 97. I don't know if that makes any difference.

Did you drain the coolant first or did you just swap out the coolant sensor with coolant still in it?

 

[ajax1]

Did you drain the coolant first or did you just swap out the coolant sensor with coolant still in it?

Just swap it out

 

[Cruisin94]

Just swap it out

That worked ! I put some teflon tape on it, tightened it up. And it actually revved up a little upon start up-like it was roaring back to life. Thank you !