coolant temp sensor problems
 

Here is the situation.

Y8 motor in a 94 EX civic. P28 ECU.

I put an aftermarket water temp gauge in, so I replaced the stock sensor with the aftermarket one. Gauge works great, but I was getting a check engine light for the CTS. So I tapped the "eater neck" housing on the front of the head, where the bleed screw is on Z6 motors.

The stock gauge is acting normally but the CEL for the sensor is not going away. This is quite upsetting. I was thinking about swapping the placement of the two sensors, but they are essentially 4in apart on the head, so I would think the temps would be the same.

Re: coolant temp sensor problems
 

the coolant sensor for the cluster is under the dist.

you removed the sensor the ecu uses.

err.. maybe the gauge cluster's sensor for temp is different location on a y8, but, still sounds like you disabled the wrong sensor.

Re: coolant temp sensor problems
 

I took out the one from under the dist and replaced it with the aftermarket one. I then put the stock one back into the other location.

Re: coolant temp sensor problems
 

sounds like you should just join hotrex.

oh.. i also have nothing to contribute to this thread. i should /myself.

Re: coolant temp sensor problems
 

Go bullshit in the GD forum. fuckn' canucks.

Re: coolant temp sensor problems
 

see if grounding the sensor helps.

but, by disconnecting the cluster coolent temp sensor shouldn`t set off any codes, the right sensor should have 1/8 NPT threads, make sure u didnt`t take out the one that sits next to it coz that`s a ecu coolent temp sensor.


oh yea spenser get back to the GD forum bish, everyone ------ hates u >:( :P

Re: coolant temp sensor problems
 

when I had the sensor out for about a week, the cluster gauge did not work, and I got a CEL for the coolant temp sensor. Code 6.

Re: coolant temp sensor problems
 

you know what now i remember i got the same problem like years ago when i first had an aftermarket water temp gauge uinstalled. what i did is to reset the ECU everytime it happens and it finally stopped after a few weeks.

Re: coolant temp sensor problems
 

put they 2 stock sensors back in the head, put the autometer sender in the water neck, be done and NO issues for 6+ years now.

Re: coolant temp sensor problems
 

I was thinking of that. The temp would be approx the same in the neck and head, but different enough that the ECU would notice the diff between the two sensors. Stock they are like an inch apart, so they are identicle.

Re: coolant temp sensor problems
 

To finish this off with the outcome, so that it has some relevance in searches.

I put the stock sensor back in the stock location in the head and moved the aftermarket one to the water neck. This solved the problem instantly.

So the lesson is to leave the stock sensors alone and just add the other ones elsewhere.

Re: coolant temp sensor problems
 

LOL!!!!!!!!!

I've watching my gauges more closely during warm up laterly since your posting. Stock gauge at 1/4 while Autometer still below 100!

FYI you'll notice the water temp goes to 160-165 and levels off there for a few miles then starts climbing to normal cruising temp of 180-185...........it's just the oil warming up!!!!!!!

Oil removes 1/3 of the engine heat and ONLY thing that cools the bearings!!!!!! I just learned this a few weeks ago.

My sender using a 29/32 drill bit and 1/4" NPT tap where the bleeder screw used to be.

http://www.bettendorf.com/~mrbone/pi...tempsender.jpg

Re: coolant temp sensor problems
 

Autometer supplied two fittings like that but I just put the sender straight into the neck like that.

I used a 10mm 1.25TP tap. looks the same as yours.

Re: coolant temp sensor problems
 

That's strange. I've had my sensor disconnected(the one wire that goes to the guage)with no CEL's. ??? I always thought that sensor was completely seperate from the ECU and the two-wire sensor was the one that supplied information to the ECU. ???
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Re: coolant temp sensor problems
 

thats how it is on my crx boost.

the sensor under the dist is for the gauges only. the engine sensor is on the back of the block.

Re: coolant temp sensor problems
 

^ Not on my ef hatch. The sensor on the back of the block is the fan switch. The sensor for the ecu is a 2 wire sensor in the head under the distributor next to the one wire sensor for the water temp gauge. I also ran with my stock temp gauge sensor unpluged with no problems. It should not throw any codes.