My idea: S52 sensor for temp gauge/ temp sensor for computer (need opinion)

[MIKe30]

he has an obd2 head, so these ports (what you are calling port 13) doesnt exist, yet. I am not sure on the thread pitch size on the obd2 dual sensor port. It may fit either the obd1 temp sensor, or the e30 gauge sensor. I am running an obd1 head, and it threads right in, so someone with the obd2 head would have to chime in. All the other swaps I have toys with were all obd1 heads.

My head is also obd2, and that schematic is of an obd2 head. It's a 96 build s52, so port 13 is still there - it is just plugged. And you don't mean "yet", you mean "anymore". That port was deleted if I'm not mistaken.

Looks like those with later obd2 heads don't have that port 13 which is why they need to tap the head - since the tb coolant outlet is not the same size as plug 13.

[Van Westervelt]

He does not have an early s52 head!

By 'yet,' I was implying that he would be tapping it as thats the smarter move.

[MIKe30]

He does not have an early s52 head!

By 'yet,' I was implying that he would be tapping it as thats the smarter move.

bahh, you made me re-read this. I read this wrong.

he has an obd2 head, so these ports (what you are calling port 13) doesnt exist, yet. I am not sure on the thread pitch size on the obd2 dual sensor port. It may fit either the obd1 temp sensor, or the e30 gauge sensor. I am running an obd1 head, and it threads right in, so someone with the obd2 head would have to chime in. All the other swaps I have toys with were all obd1 heads.

bah.

[rThor432]

OP, the OBD-1 E36 DME sensor will thread right into the spot where the OBD-2 4-prong sensor is. My solution for the gauge sensor was to shave down and re-thread the sensor to thread in where the throttle body heater port is. Easy as pie.

[omar85]

OP, the OBD-1 E36 DME sensor will thread right into the spot where the OBD-2 4-prong sensor is. My solution for the gauge sensor was to shave down and re-thread the sensor to thread in where the throttle body heater port is. Easy as pie.

sweet. this is what i needed to know. it sucks that i have to modify the gauge sensor but o well.

so i guess the next question is.... is the thread size and pitch of the coolant port the same as the thread size and pitch of the obd2 4-prong connector?

thanks for all the input so far guys.

[rThor432]

is the thread size and pitch of the coolant port the same as the thread size and pitch of the obd2 4-prong connector?

Nope. I want to say it was a 10x1.5 opposed to the 12x1.5 of the 4-prong sensor, but it has been a while. Both of those thread pitches might be off, so dont quote me on them, but htat is the basic difference. You can find out what die you need from the thread pitch on the throttle heater nipple that you are removing.

[MIKe30]

Nope. I want to say it was a 10x1.5 opposed to the 12x1.5 of the 4-prong sensor, but it has been a while. Both of those thread pitches might be off, so dont quote me on them, but htat is the basic difference. You can find out what die you need from the thread pitch on the throttle heater nipple that you are removing.

Sounds like it's definately a metric measurement then? How do you suggest I plug up that throttle heater nipple hole since I don't have the nipple and I'd rather bypass the tb anyway. Just buy some hardware from homedepot, maybe teflon tape it and plug away?

[rThor432]

Yes, definitely a metric measurement. I used one of my bits from my metric tap and die set (the only tap and die set I have). So I'm sure of that.

Are you running OBD-2 engine management, or do you have the 3-port head? If you just want to plug off the tb heater, a hardware store should have the plug that you need.

Edit: Teflon tape and/or an aluminum washer should do the trick as far as sealing it. Teflon tape is a good idea, and an especially good idea if you are re-threading a fastener, such as the temp sensor. <---That comment was less directed at you Mike, and more just general info for the sensor thing.

[omar85]

i took out the 4-prong connector to put in the temp sensor for the dme. just wanna make sure the obd1 dme temp sensor is the one with the blue head. it is the only sensor i have that will thread in.

[MIKe30]

Yes, definitely a metric measurement. I used one of my bits from my metric tap and die set (the only tap and die set I have). So I'm sure of that.

Are you running OBD-2 engine management, or do you have the 3-port head? If you just want to plug off the tb heater, a hardware store should have the plug that you need.

Edit: Teflon tape and/or an aluminum washer should do the trick as far as sealing it. Teflon tape is a good idea, and an especially good idea if you are re-threading a fastener, such as the temp sensor. <---That comment was less directed at you Mike, and more just general info for the sensor thing.

Yes, and yes to the bold. Since I have the hard line pipe that would need that bit capped off - I've decided to just order the proper tb output connector piece and I will loop the line into the spider hose bypassing the tb. I won't drive the car in the winter and I'm not using that electronic valve to determine when it should/shouldn't bypass the tb... so bypass it permantly it goes.

Curious what you have to say about the coolant hose in my cylinder head thread, check that out brother!



wish I could help you omar, but I have no idea if it's supposed to be blue..