Smog Coolant Sensor Plug on Intake

[Birdie]

I removed my smog equipment sometime ago and all’s well. However, I recently removed the starter and the abandoned coolant sensor under the intake manifold was in the way. I had to remove it and deal with coolant etc. Before I reinstall my starter I’d like to (1) confirm that without the smog equipment this sensor is obsolete and (2) find out what size it is so I can plug it.

[Stevenc22]

Yes plug it. Should be able to find a metric bolt with a copper crush washer that fits and seals.

 

That is either a M12 or M14. Measure and buy a plug

 

https://www.ebay.com/itm/184363804862?itmmeta=01HTQ7EZKGDDN6SRWASR8X9S72&hash=item2aecf068be:g:G-AAAOSwC-tfDWar&itmprp=enc%3AAQAJAAAA8LTqLIOeSydj54ImKkSXM1UaQlRvi9zwfD1dtz560vy6vJoMMEaWZzDgwq1x6BAAvYYm2yGCquAld8jFS3P7IE2UMQdP9n0SyCVQ3QG1gtMnEPFhTIsQ06GFKQhIQEnqaEVeOf8Rj9t5VRieNibKxQjme9ZRlMk5LOae4eUEfy7B%2BVIdJ4dryyLsZAdlyTUv10AYwCQQ0DD%2FzcFaZD9umfHqDMSdx4w3gETrUo7KTS0mc%2B3RTYnyTwn54HR8r1RB41n0K4QEVwkPFk8A9lCNSpUhakG749TWOgE3QGBNKY7bpzH6BiMrwkjbz042TMnjMQ%3D%3D|tkp%3ABk9SR_D5u-fVYw

 

https://www.ebay.com/itm/256437500344?itmmeta=01HTQ7G7QB5TX0M1VS66M5S8VJ&hash=item3bb4ddb9b8:g:KJ4AAOSwAyBfWqCn&itmprp=enc%3AAQAJAAAA4PRKPKn71xAsNcBcXxe4lUQwD2v47XPL8zYkbvURF%2FzgYgfVSI46Qw9vgDjBSJKVD%2F5ly3EMnGvNmmfF5EYR%2BzG83bZaI4L6GYOzRL8JjDRBIVnPgEvzvOgS3ep1SSCcl50LjMkdIPapdmhNG7I1xguDJUg9y8HWd0jSM7Ob0B%2BNKcbwVD55yASa32m2oMUNaPZWVjQtb6vzAohul%2FtQOnVT9wMtLuiAvdFGl2GxrbuBOM9GeExAHGZk7iwwsKLrN2BVV2tJa3ewL%2BAxCk2WgxtvkHUfBqjAVC5eqSEeyp%2Fz|tkp%3ABk9SR-L7wOfVYw

 

Edited April 5 by Stevenc22

[Buckeye]

Can you test that sensor if it is good or not?

willing to sell it?

[Birdie]

1 hour ago, Buckeye said:

Can you test that sensor if it is good or not?

willing to sell it?

Pm’d you.

[Eissmann]

I have a 76 with *most* of the CA smog components still on it. I looked and found there is still a sensor on my car but the tab has broken off so there is no wire connected. Can anyone explain what it does? Somehow my car passed smog without it! 

[Mark92131]

8 minutes ago, Eissmann said:

Can anyone explain what it does?

 

Temperature Switch #2 in the water jacket under the intake manifold closes at 114 degrees and grounds the Choke relay and the EGR relay.  The Choke is powered until the engine reaches operating temperature.  The EGR relay powers the Red top valve when the engine is cold (No Vacuum), then powers the Black top valve when the engine is >114 degrees (No vacuum advance).

 

Mark92131

[Eissmann]

Mark92131, Thanks for the explanation! This raises more questions, but my car is starting and running pretty well without it. I will do a little more investigation, but I don't want to hijack this thread.

[Birdie]

On 4/5/2024 at 4:56 AM, Stevenc22 said:

Yes plug it. Should be able to find a metric bolt with a copper crush washer that fits and seals.

 

That is either a M12 or M14. Measure and buy a plug

 

https://www.ebay.com/itm/184363804862?itmmeta=01HTQ7EZKGDDN6SRWASR8X9S72&hash=item2aecf068be:g:G-AAAOSwC-tfDWar&itmprp=enc%3AAQAJAAAA8LTqLIOeSydj54ImKkSXM1UaQlRvi9zwfD1dtz560vy6vJoMMEaWZzDgwq1x6BAAvYYm2yGCquAld8jFS3P7IE2UMQdP9n0SyCVQ3QG1gtMnEPFhTIsQ06GFKQhIQEnqaEVeOf8Rj9t5VRieNibKxQjme9ZRlMk5LOae4eUEfy7B%2BVIdJ4dryyLsZAdlyTUv10AYwCQQ0DD%2FzcFaZD9umfHqDMSdx4w3gETrUo7KTS0mc%2B3RTYnyTwn54HR8r1RB41n0K4QEVwkPFk8A9lCNSpUhakG749TWOgE3QGBNKY7bpzH6BiMrwkjbz042TMnjMQ%3D%3D|tkp%3ABk9SR_D5u-fVYw

 

For the record this sensor and its corresponding hole is an 

M14 x 1.5

The one listed on eBay above is a very nice option. Better than I found elsewhere.

 

Plug inserted.. Rebuilt starter installed. Good time drives to be had.