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post #1 of 13 (permalink) Old 06-03-2015, 10:03 PM Thread Starter
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Low idle after hot restart

'15 5.7 non FF. Every time after starting the engine after a brief (several minutes) stand the idle will be about 400 rpm or so for several seconds then I can clearly hear the rpms jump to about 800 like the ecm realizes this is too low idle. Also, I'm noticing when starting the engine when cold or warm I notice a slight delay after it begins to start firing. To be more clear It feels like I need to keep the starter engaged before all cylinders fire otherwise it might not start.

This has happened on several tanks of fuel from different stations and has SLOWLY gotten worse since new, but it's not severe enough that a dealer tech would duplicate it every time. Anyone have any suggestions as to what this might be? Maybe it's just a normal characteristic of the engine?

3000 miles.

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post #2 of 13 (permalink) Old 06-04-2015, 10:33 AM
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Take it back to the dealer.

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post #3 of 13 (permalink) Old 06-04-2015, 11:19 PM
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Because the dealer can't reproduce it "every" time doesn't seem like a valid "excuse". If they can reproduce it 2 of 10 starts, they should have it in their repair bay until they can describe to you what was wrong and how they resolved it.

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post #4 of 13 (permalink) Old 06-05-2015, 09:17 AM
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Sounds like the fuel pressure may not be holding when the engine is shut off.

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post #5 of 13 (permalink) Old 06-05-2015, 10:15 AM
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Sounds like the fuel pressure may not be holding when the engine is shut off.
Sounds legit.

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post #6 of 13 (permalink) Old 06-12-2015, 02:33 PM Thread Starter
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Update: So I think I have figured out the problem. I usually fill up with 87 octane, but last week I filled up with 93 octane and went on a 800 mile road trip. During the course of the trip i've used 93 as my first tank, 87 as my second, and 89 as my third. Now today I filled up again and i'm using 89. The problem has gone away completely EXCEPT the one time I filled up with 87, then went away when I used higher grade fuel. It seems my truck doesn't like 87 octane fuel. It runs just fine on 87 with the exception of hesitant start.

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post #7 of 13 (permalink) Old 07-09-2015, 02:55 PM
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My 2012 5.7 has done this rpms fall to about 400 then goes back to normal rpms Cold or hot. I see this when at a stop light also feel my brake pedal get soft as well. Hopefully This Friday I'll be able to drop it off and see what's up.

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post #8 of 13 (permalink) Old 07-09-2015, 03:53 PM
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If you have the a/c on the rpms will float a bit with the a/c compressor cycling on, As well it will idle slightly higher if the lights are on while in gear

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post #9 of 13 (permalink) Old 07-09-2015, 09:02 PM
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I drove my wife's 13 v6 4x4 Tacoma today and it does the same thing. I guess It's more notice
now due to the BAmuffler because of the sound.
Thanks for the info @Ditchhooker

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post #10 of 13 (permalink) Old 07-21-2015, 06:44 PM
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Well I had my truck at the dealer for warranty stuff and mentioned the low idle to them. They cleaned the throttle bottle under warranty at no charge so I'll report back on how it goes.

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post #11 of 13 (permalink) Old 08-23-2015, 11:16 PM
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Mine is doing the same thing(kind of), it only does on cold start and it gets worse the colder the outside temp gets. Mine is a 15 FFV with 8000 miles and I always fill up with 91 at shell(seams to be the best fuel in my area). I guess I'll take it to the dealer but my problem with that is if it only does it on a cold start, it well likely not do it once I get there.
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post #12 of 13 (permalink) Old 08-24-2015, 12:52 AM
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After throttle body cleaning I hAve yet to have the low rpm problem anymore. I run only 89 octane or better so that did not help keep it from getting dirty.
Anyways clean that throttle body and see what you get .

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post #13 of 13 (permalink) Old 08-24-2015, 08:04 AM
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Originally Posted by Mike Hickman View Post
After throttle body cleaning I hAve yet to have the low rpm problem anymore. I run only 89 octane or better so that did not help keep it from getting dirty.
Anyways clean that throttle body and see what you get .
I had a similar issue with my 07 and the 4.7. A little throttle cleaner in the throttle body fixed it.

A new vehicle shouldn't be doing this... but you might have gotten some rather dirty fuel. It happens sometimes.
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