brrrr, cold start this AM, revving @ 1KRPM ?

[buggz]

Hello,

It was cold in metro ATL this AM, 27degF.

Don't laugh, that's cold for here.

Anywho, I went to start my truck to heat it while I finish preparing for yet another work day, start up went okay, turn key to ON, wait for the air/fuel hearter symbol to disappear, then started right up as normal, no smoke, no problems.

Anywho, after I finished brushing teeth, etc, opened my house door, gee, that sounds loud.

Opened the truck door, and the tach was showing 1KRPM.

Hmm, that's never happened before, even on other cold days, though, not as cold as today.

Anywho, I took it out of park, and the RPMs immediately went to normal idle, 750RPMS.



So, I'm guessing this is normal ?

Shrug, it drove normally.

 

[gonzo2]

Your guessing was correct.

 

[Wasilla Rod]

When I hear mine ramp up I know my sweetheart is rubbing her hands together warming up for me !!

 

[AH64ID]

Yep perfectly normal. Tapping the brake will also return the rpms to 750, so those extra rpms don't slam your transmission.

~32*F after 2 minutes rpms ramp to 1000 (until 160*F coolant temp)
~15*F immediately rpms ramp to 1000 (until 160*F coolant temp)

 

[C. Harlan]

or have dealer enable high idle, turn on the cruise, hit set, and have the option to idle from 1,100-1,500 RPM whenever you want!



*NOTE* you must ground #22 BUS pin on motor for this to feature work on manual transmission equipped trucks. .



-Chris-

 

[Chemical103]

I am curious what does the computer use to determine the outside temp? Is it the same as our overhead. If so is it as inaccurate as our fuel mileage readings?

 

[AH64ID]

I am curious what does the computer use to determine the outside temp? Is it the same as our overhead. If so is it as inaccurate as our fuel mileage readings?

I believe its the air temp sensor in the intake, after the filter and before the turbo.



The OAT guage is actually pretty accurate on my truck... above 20mph.