water loss, does anyone know

Subject: water loss, does anyone know Fri Jul 27, 2007 11:28 pm

there is water loss, it is lossing a little more and more every month and could never find where it was going. know that it is loosing more it does show some signs of going into the oil at my last oil change. it also now looks like there is some signs of water coming out of the engine at where the intake touches the head. does anyone know if it is an intake or head gasket. thanks for your support. the 96 SC at 60k was loosing water but could not find where it was going even on a pressure test but now at 110k 7months later it showes signs of loosing water into the oil. is there a common problem with the intake gasket or head gasket anyone knows of

Subject: Re: water loss, does anyone know Fri Jul 27, 2007 11:45 pm

this is only your 2nd post. Mileage and a few more details would help.

Subject: Re: water loss, does anyone know Mon Jul 30, 2007 10:04 am

I think there is a known issue with the lower intake manifold going bad on N/A 3800s, which could cause the symptoms you're seeing. Maybe some of the N/A guys can chime in with more info.

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch
^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown

Subject: Re: water loss, does anyone know Thu Sep 20, 2007 4:21 pm

I had the same problem on my '96 riv. Some dummy at gm decided to mount plastic parts onto metal parts.....nonetheless sounds like you have an upper intake(the black plastic piece that sits on top of the motor. you can get one for about $150 bucks, and it'll probably take about 20-30 min to replace. make sure you drain the oil when you do this, and put new spark plugs in there. hope this helps!
reese

Subject: Re: water loss, does anyone know Thu Sep 20, 2007 5:00 pm

Thanks for the tip, Resse. Welcome to our forums!

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch
^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown

Master Joined : 2007-01-16 Post Count : 8072 Merit : 105

AA wrote:: I think there is a known issue with the lower intake manifold going bad on N/A 3800s, which could cause the symptoms you're seeing. Maybe some of the N/A guys can chime in with more info.

She says it's an SC but I agree it sounds like the common NA plastic intake manifold problem.

Subject: Re: water loss, does anyone know Fri Sep 21, 2007 8:36 am

Oh, didn't see that before. I see the first post has been edited.

Moved to SC Tech...

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch
^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown

Subject: Re: water loss, does anyone know Fri Sep 21, 2007 10:46 am

It might be the Lower intake manifold gaskets. Dex-cool has been known to rot these gaskets away. I changed my Lim on my car and noticed that the LIM gaskets had been replaced. Here is some Dex cool ugliness

willwren wrote:

willwren wrote:: The thread is directly about DEX.

Here's a set of L36 LIM gaskets at about 30-35k miles. Please note that the DEX was probably already acidic when these were installed:

Now for the explanation:

Subject: Re: water loss, does anyone know Fri Sep 21, 2007 11:46 am

A good reason to keep your DexCool fresh!

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch
^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown

Subject: Re: water loss, does anyone know Fri Sep 21, 2007 8:08 pm

AA wrote:: A good reason to keep your DexCool fresh!

A better reason to dump that crappy DexCool.