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Discussion Starter #1
Hi all

While troubleshooting a high rpm on idle I noticed that my coolant stays around 78/80 C (172-176 F) while driving and doesnt go above 85C (185F) at idle.
What is the normal coolant temp? Is time for a new thermostat?

Thanks

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Hi all

While troubleshooting a high rpm on idle I noticed that my coolant stays around 78/80 C (172-176 F) while driving and doesnt go above 85C (185F) at idle.
What is the normal coolant temp? Is time for a new thermostat?

Thanks

Sent from my GM1920 using Tapatalk
78-80C is normal operating temp when driving. My car idle temp stays also in 83-85C area. Once i've seen 88C when idling and it was over +30C outside.

My thermostat was replaced last year because driving temps were 75C and got thermostat error code.
 

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Discussion Starter #3
78-80C s normal operating temp when driving. My car idle temp stays also in 83-85C area. Once i've seen 88C when idling and it was over +30C outside.
Thanks alot... I also have a post cat oxygen on bank1..I will change it soon to see if it cures the highish rpm on idle

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I remember high rpm being due to cat adaptations. Reset the cat adaptations and see if that fixes the issue. IF so chances are the cats are dying.
 

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I remember high rpm being due to cat adaptations. Reset the cat adaptations and see if that fixes the issue. IF so chances are the cats are dying.
Oh..so the post cat oxygen code might be because the cat doesn't do its job properly. Is there any way to test the cats prior to changing them. Could be the O2 sensor faulty?
 

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No idea what code you have and if I did I wouldn't know what to do anyway other than follow the ista test plan. I do think the dme is smart enough to know a cat issue from an o2 sensor issue.
 

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Discussion Starter #7
I remember high rpm being due to cat adaptations. Reset the cat adaptations and see if that fixes the issue. IF so chances are the cats are dying.
You were right.. resetting cat adaptation takes the idle rpm where it should be....I been having a post cat O2 code for a while ...I've replaced it today and the code seems to be gone....I ll see whether or not the high rpm comes back. Before clearing up the O2 code I had to reset the cats adaptation few times as within 100 miles high rpm would resurface...the value of cats adaptation while having high rpm was 0.42 on both banks..
 

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78-80C is normal operating temp when driving. My car idle temp stays also in 83-85C area. Once i've seen 88C when idling and it was over +30C outside.
Optimum temp is when the needle hit 210 Fahrenheit, otherwise lower than this will promote carbon build-up. Mine was running lower before the thermostat was replaced. I then pour down Chevron Techron twice tankful, and let the dealer perform Induction Cleaning https://www.m5board.com/threads/fuel-injection-induction-cleaning.214439/
 

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Weird I posted the same as you on m6 side of the forum good to see its normal - it’s runs cold compared to the m62 in the Range Rover running over 100c! Probably keep things better condition. I never see my oil temp swing over half like that is that normal? It’s mainly between a quarter and half
 
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andresousa1791
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