02-05-2023, 10:23 AM
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#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 can’t figure it out. He said maybe an electrical issue
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02-05-2023, 11:47 AM
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#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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02-05-2023, 12:06 PM
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#3
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By faster do you mean it rev's higher than normal after a warm start?
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1991 4runner 4wd Auto V6
1990 4runner 4wd Auto V6
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02-05-2023, 12:54 PM
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#4
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Clean the Idle Air Control (IAC).
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02-05-2023, 02:17 PM
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If you just replaced the battery it may need to relearn it’s hot idle IAC position. It’s 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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02-05-2023, 07:27 PM
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#6
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Quote:
Originally Posted by brillo_76
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, I’ll do some research
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🇺🇸 2005 Limited v8, 255/75/17 Mastercraft MXT, ToyTec 3” Lift With Superflex Rear Springs, LED Interior Swap, 161,000 Miles 🇺🇸
🇺🇸 2000 Limited 3.4, 166,000 Miles, Bone Stock...Currently 🇺🇸
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02-05-2023, 07:28 PM
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#7
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Quote:
Originally Posted by alumarine
By faster do you mean it rev's higher than normal after a warm start?
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By faster I mean this. When engine is cold, it’ll take say 2 seconds to start or so. Whe engine is warm and operating temp it’ll start in like 1/4 of a second
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🇺🇸 2005 Limited v8, 255/75/17 Mastercraft MXT, ToyTec 3” Lift With Superflex Rear Springs, LED Interior Swap, 161,000 Miles 🇺🇸
🇺🇸 2000 Limited 3.4, 166,000 Miles, Bone Stock...Currently 🇺🇸
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02-05-2023, 07:29 PM
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#8
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Quote:
Originally Posted by Buckaroo
Clean the Idle Air Control (IAC).
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Will do, I’ll look into it and clean it when I get a chance. Thanks!
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🇺🇸 2005 Limited v8, 255/75/17 Mastercraft MXT, ToyTec 3” Lift With Superflex Rear Springs, LED Interior Swap, 161,000 Miles 🇺🇸
🇺🇸 2000 Limited 3.4, 166,000 Miles, Bone Stock...Currently 🇺🇸
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02-05-2023, 07:31 PM
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#9
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Quote:
Originally Posted by 19963.4lsr5
If you just replaced the battery it may need to relearn it’s hot idle IAC position. It’s 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. It’s been happening since I bought it 2 years ago. It’ll start every time no matter what, just super fast when warm. And when it’s warm, it’ll settle around 700rpm or so? I don’t drive it daily or actually much at all. Have a company car that I use every day
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🇺🇸 2005 Limited v8, 255/75/17 Mastercraft MXT, ToyTec 3” Lift With Superflex Rear Springs, LED Interior Swap, 161,000 Miles 🇺🇸
🇺🇸 2000 Limited 3.4, 166,000 Miles, Bone Stock...Currently 🇺🇸
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02-05-2023, 08:19 PM
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#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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Last edited by Pyral; 02-05-2023 at 08:21 PM.
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02-05-2023, 08:38 PM
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#12
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Quote:
Originally Posted by SC_4RunnerSC
By faster I mean this. When engine is cold, it’ll take say 2 seconds to start or so. Whe engine is warm and operating temp it’ll start in like 1/4 of a second
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Normal.
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1991 4runner 4wd Auto V6
1990 4runner 4wd Auto V6
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02-05-2023, 08:47 PM
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#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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02-06-2023, 05:17 AM
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#14
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Quote:
Originally Posted by SC_4RunnerSC
By faster I mean this. When engine is cold, it’ll take say 2 seconds to start or so. Whe engine is warm and operating temp it’ll start in like 1/4 of a second
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I thought you meant rev higher. Yea, this is normal.
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02-06-2023, 09:17 AM
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#15
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I'll pile on. What you are experiencing is 100% normal.
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