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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 > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 07-29-2007, 10:09 PM
imnothot02 imnothot02 is offline
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2002 Chevy TrailBlazer LT
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Proper engine temp./.

My truck 4.2 runs rite at 210 all the time, what does everybody else think it should be at, i know that 210 is normal i wish it were cooler tho..
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  #2  
Old 07-29-2007, 10:25 PM
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Michblaze02 Michblaze02 is offline
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Thats pretty much where mine hangs out too. I guess from what I hear that these engines like it a little warmer then most. So if your looking to reduce the temp of your engine somehow, I wouldn't go to low might end up losing performance or worse. Maybe someone else could shine some more light on the subject.
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  #3  
Old 07-29-2007, 10:29 PM
ScarabEpic22 ScarabEpic22 is offline
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Mine is anywhere from a hair cooler than 210 to 210F according to the dash. With EFILive hooked up the actual temp ranges between 203-207F (so the dash guage is decently accurate for the LL8). This is the temp this engine was designed to run, so all you old school V8 guys used to seeing them run at like 180-190 (and the V8s), DONT CHANGE THE THERMOSTAT IN THE LL8!! It will mess up mileage and the engine will not be as efficient. The I6 and Vx motors are designed to run at different temps.
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Old 07-29-2007, 10:49 PM
imnothot02 imnothot02 is offline
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yea im new to this motor its the i6 i had a crapota (dakota) and that had a 180 stat
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Old 07-29-2007, 11:42 PM
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I run lower than 200. I would say 190 deg
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  #6  
Old 07-30-2007, 04:15 PM
rcam81 rcam81 is offline
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My old 2003 ran around 205 to 210 until I put Mobil 1 in it. Then it dropped to 190 to 195. When pulling the boat it never went over 210 after putting Mobil 1 in it.
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Old 06-23-2008, 06:00 AM
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AbuAbdulAziz AbuAbdulAziz is offline
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Hey every one,
sorry to bring his out of the dead, but its always better than starting a new thread at least people might read ever thing and get a better picture... so mine WAS also running cool the past 4 years, but this time after my yearly 1400K trip, at the last 100 Kilometers and the temp gauge jumper over the half and started moving to the end FAST checked every thing, it was even serviced fr the 80K service befor i started the trip, coolant is full, fans r working, donno whats going on .when i made it to my destination, i parked the car for a hole day, and at NIGHT when i stared it jumped to half way right a way it NEVER did that ever.. but when i turn the a/c off it backs of a little to the half mark ...
heres a pic of where it ALWAYS was :


and where its ALWAYS at now


and bw, for the TECH xperts, how far can i go till its dangerous enough and the engine must be shut ? my old man always told me never to shut down an engine when its hot, but leave it cool it self down 1st, and thats what i always do...
need help you guys, i am 1400K a way from my dealer and n these areas most people dont knowjack about Chevys PLEASE help my car is in pain
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Old 06-23-2008, 06:38 AM
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The cool down thing was mainly to avoid vapor lock in carburated engines...& the manual says up to 235 is normal for these engines.

My 06 always runs 210 to slightly above...always has Normal

Those that used to run here, but have begun seeing the temp go higher all of a sudden, may be experiencing the start of a fan clutch failure. But if the temp is remaining under the 3/4 mark, the engine will run fine
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  #9  
Old 06-23-2008, 06:54 AM
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Running in Kuwait

It's pretty warm here in Kuwait now and getting up around 116 to 120 in the daytime. Last Saturday I had to go to one of the outlying caps up toward the Iraq border and my coolant temp was up in the 225 range running 80 Mph with AC on. I noticed before that it would take a while to get to operating temperature and I would get a wide fluxuation in temp. My check engine light would come on for a while then go off for a few days. I installed an Interceptor Scan Gauge and I got two codes, one for the thermostat and one for fan speed circuit. This weekend I changed the thermostat and used Dex Cool and now the temp gets up to operating range (204-207) fairly quickly and at 75 to 89 mph the temp stays at 207 - 210 range. Now as soon as the E-fan controller is ready form PCM4Less for my I6, I'll get rid of the old fan.
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Old 06-23-2008, 08:23 AM
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AbuAbdulAziz AbuAbdulAziz is offline
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Quote:
Originally Posted by PROSPHOTO View Post
The cool down thing was mainly to avoid vapor lock in carburated engines...& the manual says up to 235 is normal for these engines.
my 06 always runs 210 to slightly above...always has Normal
Those that used to run here, but have begun seeing the temp go higher all of a sudden, may be experiencing the start of a fan clutch failure. But if the temp is remaining under the 3/4 mark, the engine will run fine
no no fan clutch thank god ! no noises and fan working great !!thanks buddy

Quote:
Originally Posted by drhinckley View Post
It's pretty warm here in Kuwait now and getting up around 116 to 120 in the daytime. Last Saturday I had to go to one of the outlying caps up toward the Iraq border and my coolant temp was up in the 225 range running 80 Mph with AC on. I noticed before that it would take a while to get to operating temperature and I would get a wide fluxuation in temp. My check engine light would come on for a while then go off for a few days. I installed an Interceptor Scan Gauge and I got two codes, one for the thermostat and one for fan speed circuit. This weekend I changed the thermostat and used Dex Cool and now the temp gets up to operating range (204-207) fairly quickly and at 75 to 89 mph the temp stays at 207 - 210 range. Now as soon as the E-fan controller is ready form PCM4Less for my I6, I'll get rid of the old fan.
warm ? DUDE you can latterly fry an egg on the hood these days, ts freakin HOT !!
ok so its ok if the gauge goes up as long as the " check engine " light doesnt come on ? coud it be my thermos then ???
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