LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Cooling Fan Question?

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Old Apr 23, 2011 | 06:37 AM
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Does anyone know if both cooling fans should turn on at start engine for a '93 LT1? Or does the primary turn on first and then Secondary when engine hot?..

please help, thanx
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Old Apr 23, 2011 | 08:50 AM
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The fans should not be on at startup (maybe you have a trouble code that is causing it?)

93s and early 94s have primary and secondary fans. The primary fan comes on first, then the secondary (if necessary).

http://shbox.com/1/4th_gen_tech2.html#cooling
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Old Apr 27, 2011 | 05:40 PM
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Hey thanx for the heads up shbox! Hey was checking your website and seems u know a lot about these models. Question? My car won't go over 40mph, doesn't kick in third gear as I'm driving. Rpms go over 5k and it won't throw another gear. Its like its stuck on second. Do you know what might be causing this?
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Old Apr 27, 2011 | 06:37 PM
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Check for transmission trouble codes, first.
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Old Apr 27, 2011 | 07:36 PM
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Sounds like the cars in limp mode for some reason.
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Old Apr 27, 2011 | 11:05 PM
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shbox:
I checked for trouble codes with a paperclip as you had recommended before. All I get is dtc 12. No other code. Could this be that ECM bad?
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Old Apr 27, 2011 | 11:11 PM
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But will do,
Does anyone know any mechanic that specializes in these cars here in south texas?
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Old Apr 27, 2011 | 11:15 PM
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where in south texas?
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Old Apr 28, 2011 | 06:03 AM
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I'm from Mission, Tx..
Down on the Rio Grande Valley
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Old Apr 28, 2011 | 06:10 AM
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Originally Posted by rich5368
Sounds like the cars in limp mode for some reason.
Limp mode is a condition in which the PCM loses just about ALL critical inputs from it's sensors and is VERY RARELY experienced. I doubt this is the case here.
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Old Apr 28, 2011 | 10:29 AM
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well that's good to know.
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Old Apr 28, 2011 | 07:39 PM
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True good point. I just sounded like it to me with the shifting issues he was saying.
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