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Old 02-05-2023, 10:23 AM #1
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Fast start when engine is warm

Before I go any further I have searched for answers on the forum. Some threads were close to my symptoms, but not exact. New battery, alternator, starters, battery cables

So when my engine is cold, it starts normal. Whenever I am running errands or traveling and the engine is at operating temp-it will start extremely faster than a normal cold start. Any thoughts? The mechanic I take it to is stumped and canít figure it out. He said maybe an electrical issue
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Old 02-05-2023, 11:47 AM #2
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The fuel pump will not tun o until it gets a signal from the crank position sensor so that's mostly a 1.5 to 2 second after engaging the starter at cold.

When hot the fuel pressure is probably already there and it starts faster taking less time to fire up.

Most vehicles turn the fuel pump on when the key is in the on position. The 3rd gen 4 runner waits for the signal before enabling as a safety feature.



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Old 02-05-2023, 12:06 PM #3
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By faster do you mean it rev's higher than normal after a warm start?
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Old 02-05-2023, 12:54 PM #4
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Clean the Idle Air Control (IAC).
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Old 02-05-2023, 02:17 PM #5
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If you just replaced the battery it may need to relearn itís hot idle IAC position. Itís an adaptive parameter that goes to factory default when the ECU looses power.

Could be a dirty IAC also. What does the hot idle settle to after a hot restart?


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Old 02-05-2023, 07:27 PM #6
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Quote:
Originally Posted by brillo_76 View Post
The fuel pump will not tun o until it gets a signal from the crank position sensor so that's mostly a 1.5 to 2 second after engaging the starter at cold.

When hot the fuel pressure is probably already there and it starts faster taking less time to fire up.

Most vehicles turn the fuel pump on when the key is in the on position. The 3rd gen 4 runner waits for the signal before enabling as a safety feature.



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So I should look into the crank position sensor? Thanks for the info, Iíll do some research
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Old 02-05-2023, 07:28 PM #7
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Quote:
Originally Posted by alumarine View Post
By faster do you mean it rev's higher than normal after a warm start?
By faster I mean this. When engine is cold, itíll take say 2 seconds to start or so. Whe engine is warm and operating temp itíll start in like 1/4 of a second
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Old 02-05-2023, 07:29 PM #8
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Quote:
Originally Posted by Buckaroo View Post
Clean the Idle Air Control (IAC).
Will do, Iíll look into it and clean it when I get a chance. Thanks!
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Old 02-05-2023, 07:31 PM #9
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Quote:
Originally Posted by 19963.4lsr5 View Post
If you just replaced the battery it may need to relearn itís hot idle IAC position. Itís an adaptive parameter that goes to factory default when the ECU looses power.

Could be a dirty IAC also. What does the hot idle settle to after a hot restart?


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This happened before I changed the battery as well. Itís been happening since I bought it 2 years ago. Itíll start every time no matter what, just super fast when warm. And when itís warm, itíll settle around 700rpm or so? I donít drive it daily or actually much at all. Have a company car that I use every day
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Old 02-05-2023, 07:36 PM #10
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This is normal for these 3rd gens. What you are stating is normal behavior. :-)

Idle settling around 600 700 rpm is normal when all warmed up too.. :-)
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Old 02-05-2023, 08:19 PM #11
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I don't see the problem. It's normal for the engine to start easier when warmed up.

My 4runner will start almost immediately when I twist the key and the engine is warm. Takes longer when it's cold, but no more than a second even then. The RPM will be above 1000 at idle on a cold start and go down to 700 rpm. Everything your describing is normal engine behavior.

Do modern cars not behave this way anymore? Every car I've been in with a twist key has always started easier on a warm engine.
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Old 02-05-2023, 08:38 PM #12
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Quote:
Originally Posted by SC_4RunnerSC View Post
By faster I mean this. When engine is cold, itíll take say 2 seconds to start or so. Whe engine is warm and operating temp itíll start in like 1/4 of a second
Normal.
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Old 02-05-2023, 08:47 PM #13
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Yea pretty sure this is normal. Mine does it and have always thought it was normal.
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Old 02-06-2023, 05:17 AM #14
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Quote:
Originally Posted by SC_4RunnerSC View Post
By faster I mean this. When engine is cold, itíll take say 2 seconds to start or so. Whe engine is warm and operating temp itíll start in like 1/4 of a second

I thought you meant rev higher. Yea, this is normal.


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Old 02-06-2023, 09:17 AM #15
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I'll pile on. What you are experiencing is 100% normal.
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