EOT was 50 over ECT!!
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Cross-Country
Joined: Sep 2010
Posts: 60
Likes: 1
From: Newberg Oregon
EOT was 50 over ECT!!
So we were towing our toy hauler, about 8500 lbs up a hill going over the coast range and I saw on the scan gage the EOT about 230 and the ECT about 200, then as we crest the summit it hit 259 and the ECT was 209. Cruising on the flat it stayed about 20 degrees over the coolant which tells me it's time for oil and EGR cooler replacement. The truck is a 2006 with 50K on it, I can do the replacement myself but I asked a local shop who specializes in super dutys what they charge and they strongly recommended changing the head studs also at the cost of $8500 for them to do it. Is it necessary to do the studs if Im not having any problems? I do not want to do the heads myself so it would be the shop doing the work.
Token Redneck
Joined: Jun 2007
Posts: 9,339
Likes: 350
From: Breckenridge, TX
I wouldn't do the studs unless you show cooling system pressure over 16psi after the oil cooler/EGR cooler swap. Why buy trouble if it isn't for sure broke?
$8,5000 sounds very steep to me, but maybe it's because I haven't priced studs lately?
Did you double check for sensor bias by comparing cold soak temps? If the split popped up suddenly I'd start there first, just to make sure a $100 sensor doesn't cost you $8,500.
$8,5000 sounds very steep to me, but maybe it's because I haven't priced studs lately?
Did you double check for sensor bias by comparing cold soak temps? If the split popped up suddenly I'd start there first, just to make sure a $100 sensor doesn't cost you $8,500.
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
So we were towing our toy hauler, about 8500 lbs up a hill going over the coast range and I saw on the scan gage the EOT about 230 and the ECT about 200, then as we crest the summit it hit 259 and the ECT was 209. Cruising on the flat it stayed about 20 degrees over the coolant which tells me it's time for oil and EGR cooler replacement. The truck is a 2006 with 50K on it, I can do the replacement myself but I asked a local shop who specializes in super dutys what they charge and they strongly recommended changing the head studs also at the cost of $8500 for them to do it. Is it necessary to do the studs if Im not having any problems? I do not want to do the heads myself so it would be the shop doing the work.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
50* seems a bit high. I will seen a delta of up to 30* when topping a good hill climb but slowly see the two numbers get back to between 12-15* once running flat again.
I'd run it empty and flat at 65mph to set a baseline. I'd then expect 8-12* avg delta.
Many will stud an engine when adding addition turbo psi or a tuner. Most have said its not a big deal if you only run stock.
I'd run it empty and flat at 65mph to set a baseline. I'd then expect 8-12* avg delta.
Many will stud an engine when adding addition turbo psi or a tuner. Most have said its not a big deal if you only run stock.
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Cargo Master
Joined: Oct 2003
Posts: 2,833
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From: Jefferson, Iowa
The 15 deg standard is based on an unloaded truck. Was your fan roaring trying to cool everything down? As stated check a cold soak sensor reading, wait 12 hours before checking, tft ect eot iat1. Also how is your coolant cap? There are a lot of bad caps out there venting below 16 psi, something to check if it is running hot.
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Thread Starter
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Cross-Country
Joined: Sep 2010
Posts: 60
Likes: 1
From: Newberg Oregon
I feel better after reading the comments. What is a cold soak? I can search but it may be quicker if someone comments here. The out side temp was 53 degrees, I don't remember the fan being loud. Maybe it is the sensor. Good info, thanks all
Logistics Pro
Joined: Dec 2004
Posts: 4,138
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From: South Weber, Utah
Cold soak just means after the truck has not been run over night and check the temperatures before you start the truck the next morning.
Thread Starter
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Cross-Country
Joined: Sep 2010
Posts: 60
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From: Newberg Oregon
I did a cold soak this morning, outside was 47 degrees and so were both the EOT and ECT. Ran at 60 mph on flat and delta was between 8 and 12 degrees. Could the 50 degree difference be a sensor? I will throw on a new cap for giggles.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Testing at 47* outside temp, might give you a false sense iof the trucks cooling capacities, knowing the problem will show more effect, at much higher outside air temps.
I too replaced my coolant cap as that's a good place to start.