Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 07-31-2007, 12:12 PM   #1
D_Train
3" Exhaust
 
Join Date: Mar 2007
Location: Wisconsin
Posts: 214
D_Train is on a distinguished road
Default strange temp gauge activity

I'll be driving and my temp gauge will go down to zero, then back up to the regular operating temp, then drop about 3 lines, then go up again, then down, and it keeps doing this. It will happen every now and then, but mostly when i accelerate from a stop. I am also loosing coolant and its not a BHG. Could the thermostat be causing my coolant loss?
D_Train is offline   Reply With Quote
Old 07-31-2007, 04:28 PM   #2
dcrusupra
Jive Turkey MOD
 
dcrusupra's Avatar
 
Join Date: Aug 2005
Location: Plantation, Fl.
Posts: 1,052
dcrusupra is on a distinguished road
Default

There is probably a small leak in a hose somewhere. The temp gauge going up and down is probably a loose connection on the temp housing. Did you check the hoses behind the head? Those are a common trouble area as far as coolant hoses go.
__________________
New Rebuild
My CarDomain
dcrusupra is offline   Reply With Quote
Old 07-31-2007, 04:58 PM   #3
D_Train
3" Exhaust
 
Join Date: Mar 2007
Location: Wisconsin
Posts: 214
D_Train is on a distinguished road
Default

Quote:
Originally Posted by dcrusupra
There is probably a small leak in a hose somewhere. The temp gauge going up and down is probably a loose connection on the temp housing. Did you check the hoses behind the head? Those are a common trouble area as far as coolant hoses go.
I checked all the hoses. Dye'd the coolant so it would show under a black light and saw nothing leaking at all. It never leaves coolant on the ground when parked. Could the loose temp housing cause me to loose coolant?
D_Train is offline   Reply With Quote
Old 07-31-2007, 05:15 PM   #4
dcrusupra
Jive Turkey MOD
 
dcrusupra's Avatar
 
Join Date: Aug 2005
Location: Plantation, Fl.
Posts: 1,052
dcrusupra is on a distinguished road
Default

A loost temp housing definitely would. It would be leaking down the front of the motor. And it would burn off all the coolant while driving so while it would leak after you drive it, no coolant would be visible
__________________
New Rebuild
My CarDomain
dcrusupra is offline   Reply With Quote
Old 07-31-2007, 06:00 PM   #5
D_Train
3" Exhaust
 
Join Date: Mar 2007
Location: Wisconsin
Posts: 214
D_Train is on a distinguished road
Default

Quote:
Originally Posted by dcrusupra
A loost temp housing definitely would. It would be leaking down the front of the motor. And it would burn off all the coolant while driving so while it would leak after you drive it, no coolant would be visible
Well in this case all of the coolant is showing on the front of the radiator. (thanks to the dye) but I think that it is just because it is coming out of the overflow tank and spitting onto the front of the rad. if there is a rad leak wouldn't it be on both the front and back of the rad? at least just a LItTLE bit?
D_Train is offline   Reply With Quote
Old 08-01-2007, 03:37 PM   #6
mrnickleye
Old Cowboys Never Die !!
 
mrnickleye's Avatar
 
Join Date: Jun 2005
Location: Mojave Desert, Calif.
Posts: 1,705
mrnickleye is on a distinguished road
Talking Tell-a-gram for mr. d_train

Dearest D_Train,

Go get a block test done immediately ! (stop)

Your symptoms are sounding like a BHG ! (stop)

Temp gauge needle acts as you described when coolant level in engine gets too low. It goes down when air is touching the sender, then goes up when hot coolant touches sender.

Coolant over-flowing from overflow bottle indicates OVER-HEATING engine.

NOTE: A friend's '92 turbo over heating was a dirty radiator.

Good Luck, your pal skippy.
__________________
Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
mrnickleye is offline   Reply With Quote
Old 08-01-2007, 07:42 PM   #7
D_Train
3" Exhaust
 
Join Date: Mar 2007
Location: Wisconsin
Posts: 214
D_Train is on a distinguished road
Default

Quote:
Originally Posted by mrnickleye
Dearest D_Train,

Go get a block test done immediately ! (stop)

Your symptoms are sounding like a BHG ! (stop)

Temp gauge needle acts as you described when coolant level in engine gets too low. It goes down when air is touching the sender, then goes up when hot coolant touches sender.

Coolant over-flowing from overflow bottle indicates OVER-HEATING engine.

NOTE: A friend's '92 turbo over heating was a dirty radiator.

Good Luck, your pal skippy.
I have had both done. Both Negative.
D_Train is offline   Reply With Quote
Old 08-01-2007, 09:48 PM   #8
IHateHacks
20psi boost
 
IHateHacks's Avatar
 
Join Date: May 2006
Location: New Haven/Hamden
Posts: 793
IHateHacks is on a distinguished road
Default

Mr. nickleye is right. Thats why the needle goes down 3 notches and then back up, thats when it hits an air pocket.

Your symptoms scream BHG. If you are clearly losing coolant and gaining air in your cooling system, and its not leaking on the ground then the only thing it can be is the head, block or the head gasket. You should be praying its only the head gasket. I've seen cracked blocks on multiple cylinders before.

Did you remove the overflow hose from the nipple on the radiator and plug the nipple when you did your block test? If not, then you sucked outside fresh air into the tester giving you a false negative reading.
IHateHacks is offline   Reply With Quote
Old 08-02-2007, 03:47 AM   #9
D_Train
3" Exhaust
 
Join Date: Mar 2007
Location: Wisconsin
Posts: 214
D_Train is on a distinguished road
Default

Quote:
Originally Posted by IHateHacks
Mr. nickleye is right. Thats why the needle goes down 3 notches and then back up, thats when it hits an air pocket.

Your symptoms scream BHG. If you are clearly losing coolant and gaining air in your cooling system, and its not leaking on the ground then the only thing it can be is the head, block or the head gasket. You should be praying its only the head gasket. I've seen cracked blocks on multiple cylinders before.

Did you remove the overflow hose from the nipple on the radiator and plug the nipple when you did your block test? If not, then you sucked outside fresh air into the tester giving you a false negative reading.
The shop did the block test. I don't know. How Fucked Am I? There seems to be no overheating, and the shop tested and tested and tested for a BHG. He had it there for 3 days testing on and off.

Also, i'm not burning any coolant. I get the low coolant light about every 150 miles, and theres no white smoke but also i never leave coolant on the ground except out of the overflow tube.

Last edited by D_Train; 08-02-2007 at 04:49 AM.
D_Train is offline   Reply With Quote
Old 08-02-2007, 04:49 AM   #10
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

There does exist the possibility that the sender is bad or there's a short in the wiring.

EDIT: Nevermind... just saw that you're loosing coolant.
cre is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
water temp gauge install sundevil1 MKIII Supra 3 12-09-2008 04:38 PM
Water temp gauge dead Fredde MKIII Supra 4 05-27-2008 01:40 AM
Coolant temp sensor thread size?? petey turbo MKIII Supra 5 02-12-2007 06:15 PM
Oil temp gauge... what brand?? Caliturbo88 Shops & Part Reviews 0 02-05-2007 09:37 PM
temp gauge 87supraguy MKIII Supra 3 06-09-2005 03:48 PM


All times are GMT. The time now is 11:13 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86