Welcome to Camaro Z28!

Welcome to CamaroZ28.Com, the ultimate Source for Camaro enthusiasts! Here you can join over 90,000 Camaro enthusiasts from around the world discussing all things related to Camaros and more. You are currently viewing as a guest which gives you limited access to view discussions

To gain full access to our forums you must register for a free account. As a registered member you will be able to:
  • Participate in over 40 different forums and search/browse from over 5 million posts.
  • Upload your Camaro details to your Garage
  • Post photos, respond to polls and access other special features
  • Gain access to our free marketplace to buy, sell and trade Camaros, parts and more.
All this and much more is available to you absolutely free when you register for an account, so join our community today today!

If you have any problems with the registration process or your account login, please contact support.


Go Back   CamaroZ28.Com Message Board > 1967-2002 F-Body Technical Discussion > General 1967-2002 F-Body Tech
Sign in using an external account
Register Forgot Password?


Reply Post New Thread
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 11-18-2013, 06:57 PM   #1
Registered User
 
Join Date: Oct 2013
Posts: 9
93 trans am overheats

Recently purchased low mileage 93 trans am. Temp guage was not working so we changed sensor when doing opti replaced. Temp creaps up to red at lights, got stuck in traffic and had to pull over and turn it off. Going down the road, temp indicates 220. Just flushed coolant several times and have same results.

Fans come on when obd ports are jumped. Fuse is good, tried swapping relays, still no fans with temp all the way to red zone.

What am I missing???
This ad is not displayed to registered members.
Register your free account today and become a member on CamaroZ28.com!
jb4xx is offline   Reply With Quote
Old 11-18-2013, 08:25 PM   #2
Super Moderator
 
Injuneer's Avatar
 
Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 41,312
Garage
Re: 93 trans am overheats

I assume you changed the coolant temp sensor in the head, since you indicate it fixed the gauge. What about the CTS sensor in the water pump for the ECM? Have you scanned the ECM for codes?
__________________
Fred

94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
Injuneer is offline   Reply With Quote
Old 11-18-2013, 08:33 PM   #3
Registered User
 
Join Date: Oct 2013
Posts: 9
No codes when jumped the pins tonight, fans came on when jumper was in.

Changed both sensors, even put old sensor back in water pump and had same results
jb4xx is offline   Reply With Quote
Old 11-18-2013, 08:44 PM   #4
Registered User
 
Join Date: Nov 1998
Location: Louisville, KY
Posts: 2,642
Re: 93 trans am overheats

It's normal for these cars to heat up when stopped or creeping in traffic. Fans should come on right about the third hash mark. Depending on ambient temp, 220 might not be to high driving down the road.
__________________
Artificial intelligence is no match for natural born stupidity.
moparman is offline   Reply With Quote
Old 11-18-2013, 09:51 PM   #5
Registered User
 
Join Date: Oct 2013
Posts: 9
Turned the car off as it reached the line where the red. Didn't want to damage the engine
jb4xx is offline   Reply With Quote
Old 11-19-2013, 06:53 AM   #6
Super Moderator
 
Injuneer's Avatar
 
Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 41,312
Garage
Re: 93 trans am overheats

I would check the accuracy of the coolant temp sensors:

Courtesy of Shoebox

4th Gen LT1 F-body Tech Articles

Do you have access to scanning software that would show the temperature being reported to the ECM, and whether it is commanding the fans on - 1st fan at 226*F, second fan at 235*F?
__________________
Fred

94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
Injuneer is offline   Reply With Quote
Old 11-19-2013, 08:36 PM   #7
Registered User
Premium Member
 
GaryDoug's Avatar
 
Join Date: Jul 2010
Location: Florida West Coast
Posts: 417
Garage
Re: 93 trans am overheats

Like Fred suggested, get it scanned to see what the PCM sees as engine coolant temp. A bad connection in the wiring to that sensor can make the reading much lower than real and that might never turn on the fans. You can use free TunerProRT and the 93 definition file (da2.ads) to scan the readings, but will need an OBD1 cable.
__________________
1998 Trans Am, LS1, Automatic, stock all the way.

Last edited by GaryDoug; 11-19-2013 at 08:39 PM.
GaryDoug is offline   Reply With Quote
Old 11-23-2013, 09:32 PM   #8
Registered User
 
Join Date: Oct 2013
Posts: 9
Anyone in the Louisville ky area have a obd1 scanner?

Saw a usb connection obd1 for $59. Is there a cheaper option?
jb4xx is offline   Reply With Quote
Old 11-23-2013, 09:55 PM   #9
Registered User
Premium Member
 
GaryDoug's Avatar
 
Join Date: Jul 2010
Location: Florida West Coast
Posts: 417
Garage
Re: 93 trans am overheats

$59 is about as low as I have seen. You can make your own for under $20, but you have to order the materials on ebay from China (2 weeks) and it requires a small amount of electrical familiarity, like splicing wires and such. See this topic:
Scan9495: Free OBD1 scan app for 94/95 LT1
__________________
1998 Trans Am, LS1, Automatic, stock all the way.
GaryDoug is offline   Reply With Quote
Old 11-25-2013, 08:48 PM   #10
Registered User
 
Join Date: Nov 1998
Location: Louisville, KY
Posts: 2,642
Re: 93 trans am overheats

Quote:
Originally Posted by jb4xx View Post
Anyone in the Louisville ky area have a obd1 scanner?

Saw a usb connection obd1 for $59. Is there a cheaper option?
What part of town are you in?
__________________
Artificial intelligence is no match for natural born stupidity.
moparman is offline   Reply With Quote
Old 11-26-2013, 04:06 AM   #11
Registered User
 
Join Date: Oct 2013
Posts: 9
20 minutes away in Indiana

Work in east end.
jb4xx is offline   Reply With Quote
Old 11-28-2013, 07:33 AM   #12
Registered User
 
Join Date: Nov 1998
Location: Louisville, KY
Posts: 2,642
Re: 93 trans am overheats

Here's a link to a local board. I know there are some guys in southern Indiana that might be able to help. Join up and ask.

F-Bodies Unlimited Message Board - Powered by vBulletin
__________________
Artificial intelligence is no match for natural born stupidity.
moparman is offline   Reply With Quote
Old 12-01-2013, 10:09 PM   #13
Registered User
 
Join Date: Oct 2013
Posts: 9
My son attends. Diesel tech classes at local high school vocational school. His teacher asked if ac was charged. I thought, it shouldnt matter. I charged the ac until compressor kicked on and fan came on. I turned the ac off and let it idle and sure enough the high speed fan kicks on just as the guage enters the red zone!

The fan stayed on until temps were half way between the 220 and red zone

I'm thinking about installing different ect to trigger fans at lower temps. Override switch would be last resort. May replace radiator, who knows how much its blocked up. 20 year old radiator with only 56 thousand miles, car sat around a lot the last 10 years.
jb4xx is offline   Reply With Quote
Old 12-01-2013, 10:09 PM
 
Reply Post New Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:58 PM.


Copyright © 1996-2013 CamaroZ28.Com. All rights reserved.

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.