Fast idle instantly at start then wouldn't kick off.

[BILLVO]

Is it normal for the 3rd gens to go to fast idle the instant it fires up?



I normally plug it in or it sits in a heated shop but I have noticed on 2 occasions when it was cold when I started it, it went to fast idle instantly and when I stepped on the brake pedal it would not come down off of it until I put it in gear.



Is this normal or am I having issues that need to be checked out?



Normal ramp up fast idle works fine and cancels with brake but when it does it at start up it is different.

 

[MHowell]

Mine does the same thing, but only when it is REALLY cold (under 20 or so) and i forgot to plug it in. Goes away if I put the clutch in.

 

[Tomeygun]

the colder it gets the more mine wants to stay on the high idle...



No big deal, I believe that is how is it designed.

 

[RMalone]

Your fine, mine will start right into high idle also, when real cold.

 

[BILLVO]

OK so going to fast idle on start is normal when it is totally cold soaked.



But what about why is didn't cancel out when I steped on the brake pedal?

 

[DCaswell]

Mine does same thing & only cancells when clutch is depressed. Must be the way it is supposed to be

 

[pwr2tow]

Mine does the same thing, but the rpms drop instantly when I shift into gear. Scared me the first time or two, really didn't want to shift it into gear with those rpms but like I said they drop instantly.

 

[rbattelle]

But what about why is didn't cancel out when I steped on the brake pedal?

Instant fast idle is normal, as others have mentioned. I'm not sure whether this is normal.



Anyway, if the engine is cold enough to go to instant high-idle, you shouldn't be driving off until the grids stop cycling around 2 minutes.



After that, the brake should definitely stop the high idle...



Ryan

 

[BILLVO]

Instant fast idle is normal, as others have mentioned. I'm not sure whether this is normal.



Anyway, if the engine is cold enough to go to instant high-idle, you shouldn't be driving off until the grids stop cycling around 2 minutes.



After that, the brake should definitely stop the high idle...



Ryan

It isn't for drive off right away. Its to back it out of the garage so it doesn't stink up the inside of the building.

 

[Cattletrkr]

My will do the same thing. It has to be failry cold though, closer to 0*F or so. Been doing it since new and I don't think it's caused me any problems.

 

[MConyers]

When I cancel the automatic high idle with the brake pedal, either the one at start-up or after letting it idle when it is real cold... it is different than the manual high idle.



The RPMs drop off rapidly from manual high idle, compared to the automatic high idle where the RPMs ramp down really slowly. I wish the brake would set the RPMs back to a normal idle as soon as possible.

 

[pwr2tow]

Good old Chrysler corp will never get me with the Idle too long so your warranty is toast.

I jump into my truck, turn key, put transmission in neutral, wait for grid heater light to go out, start truck, wait maybe a minute (just long enough for trans fluid to circulate awhile), back out of garage, and drive away slowly (1100-1500 RPMs) for a few blocks, slowly increase speed after that but never above 2,000 RPMs until engine is up to operating temps.

If traffic doesn't like it, that's what they built more than one lane for, go around me.