Power Draw - Cold Start - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-30-2008, 08:27 AM
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jmedlin6 jmedlin6 is offline
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2005 Chevy TrailBlazer LS
4.2L I6 4X4
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Power Draw - Cold Start

Is anyone else having this problem? First off I want to say that I do have a new optima battery, 150 amp alternator (Bearings went bad in my old one), and proper serpentine belt. The problem is (and it was happening before I got the new alternator) when I start my car in the morning and its about 20F it seems to take about 10 - 15 seconds for my charging system to read normal around 14. It would hang around 12 then all of a sudden shoot up. Is this just another wonderful design flaw. It's been doing this all winter but just decided to see if anyone else is having the problem. Once its started it usually doesn't do it the rest of the day. Like I said it only does it when its cold.
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  #2  
Old 01-30-2008, 10:11 AM
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2002 Olds Bravada
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Mine does it too. I have been having this issue all winter. Figured just needed a new battery but maybe just the way the truck is.
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  #3  
Old 01-30-2008, 10:33 AM
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2004 Chevy TrailBlazer LT
Light Tarnished Silver 4.2L I6 4X4
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Mine does this too! And until everything kicks in where it should, it seems like the truck is going to stall, and I am afraid of turning anything on, such as stereo, heating fan, heated seats, etc.
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  #4  
Old 01-30-2008, 10:47 AM
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I would check your battery cables and or at least the connections. Like anythings else over time, the copper in the cables can breakdown and cause problems like that ..
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Old 01-30-2008, 10:51 AM
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This issue has been discussed several times before, both here and on another forum I use to monitor. Seems just about every TB/Envoy seems to do this, at least the ones with an I6 that use the 145a alternator. Most people only really notice that the lights suddenly brighten after a few seconds and don't watch the gages to realize its the voltage level doesn't come up to normal right away in really cold temps. There's just something in the voltage regulation circuitry of these trucks thats slow to come up to normal in cold weather. From what I've seen and read, it appears to be a normal phenomena for our trucks.
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  #6  
Old 01-30-2008, 12:12 PM
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I agree.
from previous discussions. this is more apparent on the vehicles with the AIR PUM
it appears that the alternator on the TV do not turn on immideately. It takes a few seconds for them to start putting out juice.
This appears to be more prevalent in cold weather areas and those with the AIR PUMP.
since the alternator is not yet active- the AIR pump is drawing power from the battery- which is already in a degraded mode simply because its really cold. when the alternator comes on- you see that spike- and the AIR pump had also shut off.
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  #7  
Old 01-30-2008, 10:56 PM
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New Issue

Okay, so now I think something is wrong w/ the alternator. My Headlamps flicker constantly and my guague fluctuates and doesn't stop like it usually does w/ the AIR Pump. I even let my TB sit for a few mins prior to driving. Any ideas. Do you think it is a bad alternator that I just installed?
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  #8  
Old 02-13-2008, 01:09 PM
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Alternator

Well I finally replaced the net alternator that I put in. It turned out to be faulty.
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