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Overheating really bad...

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Old Aug 2, 2004 | 01:16 PM
  #1  
HoustonL98's Avatar
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Joined: Apr 2004
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From: Houston
Car: 1989 Camaro IROC-Z
Engine: L98 5.7TPI
Transmission: TH700R4
Overheating really bad...

It has a new water pump and I just boiled the radiator out but its still overheating, although it improved a little. It is starting to get worse. I am right in thinking it could be a bad fuel pump? As every day passes I lose more power. It overheates more and more and it takes longer to start. I have been told an extremely lean condition could cause overheating. The overheating is weird too. Dropping it in neutral and revving it does nothing but make it heat up more. Driving on the highway makes it overheat like a ****...heats up less at a stand still. Please give me some tips!
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Old Aug 2, 2004 | 02:31 PM
  #2  
91RS5speed's Avatar
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Joined: Sep 2002
Posts: 330
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From: Duluth, Ga
Car: 91 RS
Engine: 305 TPI
Transmission: T56
Axle/Gears: Auburn Pro / 3.42
1 check the air dam that bolts under the radiator if u are missing that it could cause over heating problems.

2 if u think its the fuel pump check the filter and relay for the fuel pump before u do anything else
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Old Aug 2, 2004 | 02:59 PM
  #3  
omcrider's Avatar
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Joined: Mar 2003
Posts: 864
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From: Oakland Ca.
Car: 1988 GTA
Engine: 5.7L/L98
Transmission: 700r4
I don't think a fuel pump is going to casue that type of overheating. Not to say it may not be bad, but I would look at the more obvious stuff. If you put in a new pump, you sure its the proper one for your car and not a reverse rotation or anything. Also look at replacing your radiator. After 15 years they get clogged and break down. Thermostat working? Any hoses getting pinched or leaking from age? Is your coolant temp sensor working? Fans coming on?
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Old Aug 2, 2004 | 03:32 PM
  #4  
HoustonL98's Avatar
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From: Houston
Car: 1989 Camaro IROC-Z
Engine: L98 5.7TPI
Transmission: TH700R4
Definitely correct pump. Fans work fantastic. Radiator looks almost new. It looked clean on the inside before I boiled it out and now it looks brand new. I inspected each hose and each is in very good condition. I checked the flow of coolant throughout the radiator and engine and it is good and steady. I did this by disconnecting the a single hose at a time while the engine was running. When the guage reports that it is overheating bigtime I will open the hood up to find the overflow tank about to overflow. It is definitely overheating. The coolant system is definitely working.
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Old Aug 2, 2004 | 04:13 PM
  #5  
omcrider's Avatar
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Joined: Mar 2003
Posts: 864
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From: Oakland Ca.
Car: 1988 GTA
Engine: 5.7L/L98
Transmission: 700r4
Is your radiator cap holding the correct amount of pressure?

Are you getting any trouble codes? If you were running lean enough to make it that hot, you would throw a code.
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Old Aug 4, 2004 | 11:38 PM
  #6  
jamesbob02's Avatar
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Joined: Oct 2002
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From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
Check your timing. Also, make sure your balancer ring hasn't slipped, which would cause a false timing reading. I've been there myself with the overheating.....I brought the #1 cylinder to TDC on compression stroke and found my balancer ring had slipped 35 deg, so my timing was retarded by that much....I had horrible driveability and overheating problems. Check these things.
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Old Aug 5, 2004 | 05:21 AM
  #7  
contactpatch's Avatar
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Joined: May 2004
Posts: 236
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From: North Texas
Engine: sbc 350
Houston, did the car ever have Dexcool
for collant?
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Old Aug 7, 2004 | 01:33 PM
  #8  
Matthew91-Z28's Avatar
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Joined: May 2002
Posts: 1,333
Likes: 1
From: Texas
Car: 1991 Z28 Convertible
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.23 with Eaton posi
Gee..For the fluid in your tank to expand so much its overflowing is a problem. What everyone else has mentioned are good places to start for overheating stuff.

First, are you leaking any fluid? Any place in the system where there a loss of pressure could definately reduce the boiling point of the fluid, causing you to boil over that much faster. You say it has a new waterpump; did you install it? Check around it for leaks. Do you smell burned/hot coolant? Any steam escaping from anywhere?

Check for leaks and go ahead and get a new radiator cap. Might as well replace your thermostat and gasket also, as that could be the source too.

And the obvious, is your airdam there? And is the black plastic shroud that slopes down the front of the condenser and connect to the underside of the front lower spolier intact?

I live in Dallas, and keeping it under 220 in traffic is nill in the summertime.

Last edited by Matthew91-Z28; Aug 7, 2004 at 01:35 PM.
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