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05-23-2009, 11:42 PM
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#1
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15 Second Club
Join Date: Mar 2005
Location: Central NJ Somewhere...
Posts: 714
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Overheat problem... need ideas
well here we go again... did a little bit of work to the LB9 after a catastrophic failure of my 355. I threw together a modified LB9 cam, heads, mild tune. Now all it wants to do is overheat. But only when I get on it. It normally runs cool at 190 until you go above 3500. Its got a new t-stat, hoses, water pump, took out the heater core for the summer. The radiator isn't the stock GTA Aluminum, its the Steel stock one i had from another car. Would that cause it to not keep it cool?
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1988 Pontiac Trans Am GTA - Five UhOh Power
305 LB9 TPI -500/510 Cam, Ported Heads, 24# Inj Shorty Headers, TruDual Exhaust, MagnaFlow Mufflers, T-5 Swap, LT1 10 Bolt, Lowered 2.5in. 1991 Pontiac Firebird Formula - Nightmare Project 
2003 International 4300 - DT466 A5, Jerrdan 21' Rollback, Shiny Simulators.. Bling Bling Rattle Box
- iLLmINDED oNE -
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05-24-2009, 12:25 AM
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#2
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Join Date: Dec 2008
Location: Norwood, NJ
Posts: 384
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idk, i had a similar overheating problem like that and it turned out to be bad cooling fans, are all the clamps on the hoses tight?
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NORTH
1987 Camaro LT V8
2005 Chrysler PT Cruiser=POS
1981 Chevy El Camino
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05-24-2009, 08:03 AM
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#3
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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Air in the system? Do you have the air damn under the car?
And radiators are not steel. Aluminum or copper/brass
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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05-24-2009, 11:53 AM
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#4
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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Sipping antifreeze?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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05-25-2009, 11:30 PM
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#5
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15 Second Club
Join Date: Mar 2005
Location: Central NJ Somewhere...
Posts: 714
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checked all the hoses, i have a small leak at the top where one of the hoses goes in...
As for the air dam, Its got the stock GTA one under there, plus its got the Z/28 Nose openings so it has plenty of air going in there. and it just got overhauled so i dont see where it would be taking in antifreeze. I found today that my clear/green mixture of antifreeze has turned completely brown and thick. any clues on that?
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1988 Pontiac Trans Am GTA - Five UhOh Power
305 LB9 TPI -500/510 Cam, Ported Heads, 24# Inj Shorty Headers, TruDual Exhaust, MagnaFlow Mufflers, T-5 Swap, LT1 10 Bolt, Lowered 2.5in. 1991 Pontiac Firebird Formula - Nightmare Project
2003 International 4300 - DT466 A5, Jerrdan 21' Rollback, Shiny Simulators.. Bling Bling Rattle Box
- iLLmINDED oNE -
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05-26-2009, 02:02 AM
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#6
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Banned
Join Date: Jul 2008
Location: Long Branch, NJ
Posts: 805
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brown usually means either you mixed the orange and green antifreeze together or rust. the coolant probably got low and something is rusting in there. just fill it, burb it and watch it. If you have any steel tubes at the heater hoses, they sometimes use them because it's cheaper than rubber, eyeball them good. Keep the coolant up and you should be good to go.
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05-26-2009, 08:36 AM
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#7
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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you said you threw it together, was the block fresh? Maybe the block is cloggd or full of sludge? Can you drain the block. pull the thermostat and flush the engine.
next suggestion would be to check the timing or if it's running lean?
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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05-26-2009, 08:46 AM
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#8
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11 Second Club
Join Date: Aug 2004
Location: Pitman, NJ
Posts: 587
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If all that fails... What is your timing set it? Also could be running lean...
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05-27-2009, 01:03 AM
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#9
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15 Second Club
Join Date: Mar 2005
Location: Central NJ Somewhere...
Posts: 714
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I really wish i knew what my timing was. I'm gonna try this weekend to flush the cooling system.. The timing cover that i got didn't have the Marker on it so i "eyed" up TDC with #1 on the cap and been working with it from there... but i can't even check it. What about having a MSD 6AL box with a Blaster 3 coil piggy backed off the oem wiring.
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1988 Pontiac Trans Am GTA - Five UhOh Power
305 LB9 TPI -500/510 Cam, Ported Heads, 24# Inj Shorty Headers, TruDual Exhaust, MagnaFlow Mufflers, T-5 Swap, LT1 10 Bolt, Lowered 2.5in. 1991 Pontiac Firebird Formula - Nightmare Project
2003 International 4300 - DT466 A5, Jerrdan 21' Rollback, Shiny Simulators.. Bling Bling Rattle Box
- iLLmINDED oNE -
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