No cold start after prolonged sitting
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 21
Likes: 3
-
No cold start after prolonged sitting
Hello guys, I've recently discovered a problem if I can call it that. When I started the car today it didn't do its cold start. I have no cats, downpipes and remus exhaust so you can easily tell the sound difference.
I let the car idle for 30sec to 1 minute, turned it off and immediately start again and the loud usual cold start did happen this time.
From the very few threads discussing this I've seen people mentioning 3 cause:
-some say it happened a few years ago after a ecu update,
-some say is normal and it happens all the time to their car after they leave it sit over 67 hours or more (like a week),
-some say battery is losing charge somewhere.
The thing is the first time it happened to me I installed an aftermarket navigation (really recommend it btw) and in this process I mistakenly took the recommendation of my father as to remove the positive battery terminal instead of the negative battery terminal (necessary before doing the unplugging of the old nav). While attempting to plug the positive back on the thing sparked like twice and it even left little marks on the battery.
Then I started the car and this is when the cold-start didnt happened for the first time. But keep in mind the car was also not started like a week + before this so I don't know if the battery is just a coincidence and not the cause.
It didn't occur for the next couple of starts, but today it happened. Car sat approximately 100hours without being turned on.
Couldve Ive damaged my battery in that event or fried something in the fuse box? No errors displayed.
I let the car idle for 30sec to 1 minute, turned it off and immediately start again and the loud usual cold start did happen this time.
From the very few threads discussing this I've seen people mentioning 3 cause:
-some say it happened a few years ago after a ecu update,
-some say is normal and it happens all the time to their car after they leave it sit over 67 hours or more (like a week),
-some say battery is losing charge somewhere.
The thing is the first time it happened to me I installed an aftermarket navigation (really recommend it btw) and in this process I mistakenly took the recommendation of my father as to remove the positive battery terminal instead of the negative battery terminal (necessary before doing the unplugging of the old nav). While attempting to plug the positive back on the thing sparked like twice and it even left little marks on the battery.
Then I started the car and this is when the cold-start didnt happened for the first time. But keep in mind the car was also not started like a week + before this so I don't know if the battery is just a coincidence and not the cause.
It didn't occur for the next couple of starts, but today it happened. Car sat approximately 100hours without being turned on.
Couldve Ive damaged my battery in that event or fried something in the fuse box? No errors displayed.
MBWorld Fanatic!
Joined: Jul 2011
Posts: 1,146
Likes: 207
2019 AMG GT R
Hello guys, I've recently discovered a problem if I can call it that. When I started the car today it didn't do its cold start. I have no cats, downpipes and remus exhaust so you can easily tell the sound difference.
I let the car idle for 30sec to 1 minute, turned it off and immediately start again and the loud usual cold start did happen this time.
From the very few threads discussing this I've seen people mentioning 3 cause:
-some say it happened a few years ago after a ecu update,
-some say is normal and it happens all the time to their car after they leave it sit over 67 hours or more (like a week),
-some say battery is losing charge somewhere.
The thing is the first time it happened to me I installed an aftermarket navigation (really recommend it btw) and in this process I mistakenly took the recommendation of my father as to remove the positive battery terminal instead of the negative battery terminal (necessary before doing the unplugging of the old nav). While attempting to plug the positive back on the thing sparked like twice and it even left little marks on the battery.
Then I started the car and this is when the cold-start didnt happened for the first time. But keep in mind the car was also not started like a week + before this so I don't know if the battery is just a coincidence and not the cause.
It didn't occur for the next couple of starts, but today it happened. Car sat approximately 100hours without being turned on.
Couldve Ive damaged my battery in that event or fried something in the fuse box? No errors displayed.
I let the car idle for 30sec to 1 minute, turned it off and immediately start again and the loud usual cold start did happen this time.
From the very few threads discussing this I've seen people mentioning 3 cause:
-some say it happened a few years ago after a ecu update,
-some say is normal and it happens all the time to their car after they leave it sit over 67 hours or more (like a week),
-some say battery is losing charge somewhere.
The thing is the first time it happened to me I installed an aftermarket navigation (really recommend it btw) and in this process I mistakenly took the recommendation of my father as to remove the positive battery terminal instead of the negative battery terminal (necessary before doing the unplugging of the old nav). While attempting to plug the positive back on the thing sparked like twice and it even left little marks on the battery.
Then I started the car and this is when the cold-start didnt happened for the first time. But keep in mind the car was also not started like a week + before this so I don't know if the battery is just a coincidence and not the cause.
It didn't occur for the next couple of starts, but today it happened. Car sat approximately 100hours without being turned on.
Couldve Ive damaged my battery in that event or fried something in the fuse box? No errors displayed.
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 21
Likes: 3
-
Last edited by laurcrv; Mar 13, 2025 at 11:50 AM.
Trending Topics
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 21
Likes: 3
-
Hello guys, I've recently discovered a problem if I can call it that. When I started the car today it didn't do its cold start. I have no cats, downpipes and remus exhaust so you can easily tell the sound difference.
I let the car idle for 30sec to 1 minute, turned it off and immediately start again and the loud usual cold start did happen this time.
From the very few threads discussing this I've seen people mentioning 3 cause:
-some say it happened a few years ago after a ecu update,
-some say is normal and it happens all the time to their car after they leave it sit over 67 hours or more (like a week),
-some say battery is losing charge somewhere.
The thing is the first time it happened to me I installed an aftermarket navigation (really recommend it btw) and in this process I mistakenly took the recommendation of my father as to remove the positive battery terminal instead of the negative battery terminal (necessary before doing the unplugging of the old nav). While attempting to plug the positive back on the thing sparked like twice and it even left little marks on the battery.
Then I started the car and this is when the cold-start didnt happened for the first time. But keep in mind the car was also not started like a week + before this so I don't know if the battery is just a coincidence and not the cause.
It didn't occur for the next couple of starts, but today it happened. Car sat approximately 100hours without being turned on.
Couldve Ive damaged my battery in that event or fried something in the fuse box? No errors displayed.
I let the car idle for 30sec to 1 minute, turned it off and immediately start again and the loud usual cold start did happen this time.
From the very few threads discussing this I've seen people mentioning 3 cause:
-some say it happened a few years ago after a ecu update,
-some say is normal and it happens all the time to their car after they leave it sit over 67 hours or more (like a week),
-some say battery is losing charge somewhere.
The thing is the first time it happened to me I installed an aftermarket navigation (really recommend it btw) and in this process I mistakenly took the recommendation of my father as to remove the positive battery terminal instead of the negative battery terminal (necessary before doing the unplugging of the old nav). While attempting to plug the positive back on the thing sparked like twice and it even left little marks on the battery.
Then I started the car and this is when the cold-start didnt happened for the first time. But keep in mind the car was also not started like a week + before this so I don't know if the battery is just a coincidence and not the cause.
It didn't occur for the next couple of starts, but today it happened. Car sat approximately 100hours without being turned on.
Couldve Ive damaged my battery in that event or fried something in the fuse box? No errors displayed.
To anyone seeing this, no it's not normal! In my case it only happened because I disconnected the battery for a lil while before starting the car (have done mods)!
It never happened since then
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
MBWorld God!
Joined: Dec 2019
Posts: 32,529
Likes: 6,354
