LLY or LB7 + EGT reading at idle - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 02-05-2010, 03:48 AM   eBay Motors  #1 (permalink)
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LLY or LB7 + EGT reading at idle

How do I know if I have an LLY or LB7? My truck is an 04 2500HD silverado and i'm not sure which engine I have.

Second question is What are "normal" EGT readings for "normal" driving?

Third, What should the EGT be at idle?

Forth, is the EGT supposed to rise and fall with the amount of throttle being applied just like A/F does on gasoline engines?

Sorry for all the questions but I just want to make sure that my EGT readings are correct and normal. I know NOTHING about diesels.

TIA!
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Old 02-05-2010, 05:08 AM   eBay Motors  #2 (permalink)
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Quote:
Originally Posted by RICE POLICE View Post
How do I know if I have an LLY or LB7? My truck is an 04 2500HD silverado and i'm not sure which engine I have.
8th digit is either a 1 "LB7" or a 2 "LLY"
Second question is What are "normal" EGT readings for "normal" driving?
Depending on outside temp, and speed. At 2k rpms around 6-650deg
Third, What should the EGT be at idle?
Mine will get up to around 280-300deg
Forth, is the EGT supposed to rise and fall with the amount of throttle being applied just like A/F does on gasoline engines?
Yes, the more throttle, the more fuel you are dumping in resulting in higher EGT's
Sorry for all the questions but I just want to make sure that my EGT readings are correct and normal. I know NOTHING about diesels.

TIA!

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Old 02-05-2010, 06:11 AM   eBay Motors  #3 (permalink)
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Idling I can see as low as 190* and the reading at speed will depend on the tune or tuner you are using. Mine will see 1800* on the throttle heavy!!!!!
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Old 02-05-2010, 10:57 AM   eBay Motors  #4 (permalink)
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awsome! Thanks guys.. Yeah, I think i have a faulty egt probe. When I sit at idle the egt rises to about 1300 just sitting there but when I drive around it rises and falls like I would assume is normal. But either way 1300 at idle isn't a good thing lol
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Old 02-06-2010, 01:57 AM   eBay Motors  #5 (permalink)
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Called Edge and they said it's more then likely the probe so i'm gonna get a new one and see if it fixes the erroneous EGT readings...
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Old 02-08-2010, 04:46 AM   eBay Motors  #6 (permalink)
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1300 at idle is a bad reading.

Generally, more power requires higher EGT. Thermo diesel cycle reference, it is a heat engine.
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