Driving in neutral bad for engine? - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 05-22-2007, 08:14 AM   #1
Registered Member
 
GasSavers_jkandell's Avatar
 
Join Date: Feb 2007
Posts: 28
Country: United States
Driving in neutral bad for engine?

I do a lot of coasting in neutral. This has me a bit worried:
"An idling engine isn't operating at its peak temperature, which means that fuel doesn't undergo complete combustion. This leaves fuel residues that can condense on cylinder walls, where they can contaminate oil and damage parts of the engine. For example, fuel residues are often deposited on spark plugs. As you spend more time idling, the average temperature of the spark plug drops. This makes the plug get dirty more quickly, which can increase fuel consumption by 4 to 5 percent. Excessive idling also lets water condense in the vehicle's exhaust. This can lead to corrosion and reduce the life of the exhaust system."
idling-myths
__________________

__________________
GasSavers_jkandell is offline   Reply With Quote
Old 05-22-2007, 09:34 AM   #2
Supporting Member
 
Hockey4mnhs's Avatar
 
Join Date: Dec 2006
Posts: 760
Country: United States
eoc is said to be bad for a auto tranny but other then that i havent heard much about outer things
__________________

__________________
Hockey4mnhs is offline   Reply With Quote
Old 05-22-2007, 09:37 AM   #3
Registered Member
 
jwxr7's Avatar
 
Join Date: Jan 2007
Posts: 291
Country: United States
you could turn off the engine instead of idling .
__________________
Best tank= 81.23 mpg on july 1st 2008
SAVE SOME GAS, SAVE THE WORLD!

jwxr7 is offline   Reply With Quote
Old 05-22-2007, 10:13 AM   #4
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
I am no expert on engines, but have heard of the problems you are talking about. Though excess idling I imagine would be ALOT of idling. Not idling for a mile every 2 miles. I also would think that if you idled for a mile and then ran your engine somewhat hard afterwards you would blow out what was deposited during the idle. On the other hand if you were idling for hours I think it would be a different story.

That is my take on it. I am sure some more knowledgeble folks are typing up a reply right now .
__________________
Fourthbean is offline   Reply With Quote
Old 05-22-2007, 10:14 AM   #5
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
The paragraph you quoted was written to encourage Canadian drivers not to idle to warm up their stone cold cars. Completely different from when you and I idle in neutral with a fully warmed-up engine...
__________________
Bill in Houston is offline   Reply With Quote
Old 05-22-2007, 10:41 AM   #6
Registered Member
 
rvanengen's Avatar
 
Join Date: Apr 2007
Posts: 230
Country: United States
Quote:
Originally Posted by jkandell View Post
I do a lot of coasting in neutral. This has me a bit worried:
"An idling engine isn't operating at its peak temperature, which means that fuel doesn't undergo complete combustion. This leaves fuel residues that can condense on cylinder walls, where they can contaminate oil and damage parts of the engine. For example, fuel residues are often deposited on spark plugs. As you spend more time idling, the average temperature of the spark plug drops. This makes the plug get dirty more quickly, which can increase fuel consumption by 4 to 5 percent. Excessive idling also lets water condense in the vehicle's exhaust. This can lead to corrosion and reduce the life of the exhaust system."
idling-myths
An idling engine should be running at NORMAL operating temperatures within a few minutes. If this weren't so, there are a LOT of police cars that would die prematurely. I just recently got rid of a used police car I picked up on ebay, and I am sure that the motor had a LOT of "donut miles" on it. Main problem that car had was just normal police pursuit and operational wear.
__________________
-- Randall


McIntyre's First Law: "Under the right circumstances, anything I tell you may be wrong."

O'Brien's First Corollary to McIntyre's First Law: "I don't know what the right circumstances are, either."



rvanengen is offline   Reply With Quote
Old 05-22-2007, 05:35 PM   #7
Registered Member
 
VetteOwner's Avatar
 
Join Date: Mar 2007
Posts: 1,546
Country: United States
driving in neutral is not bad for anything but if the engine is off coasting down hills then your goinna run into serious tranny problems
VetteOwner is offline   Reply With Quote
Old 05-22-2007, 06:13 PM   #8
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
jkandell -

Quote:
Originally Posted by jkandell View Post
I do a lot of coasting in neutral. This has me a bit worried:
"An idling engine isn't operating at its peak temperature, which means that fuel doesn't undergo complete combustion. This leaves fuel residues that can condense on cylinder walls, where they can contaminate oil and damage parts of the engine. For example, fuel residues are often deposited on spark plugs. As you spend more time idling, the average temperature of the spark plug drops. This makes the plug get dirty more quickly, which can increase fuel consumption by 4 to 5 percent. Excessive idling also lets water condense in the vehicle's exhaust. This can lead to corrosion and reduce the life of the exhaust system."
idling-myths
Welllllll, for Saturns, leaving the car in idle causes the engine to overheat , so I am guessing that combustion isn't a problem.

It would be interesting to know the "average temperature" of a spark plug, however.

I don't worry about coasting in neutral, but I do assume that I am wearing out my clutch faster.

CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 05-22-2007, 06:17 PM   #9
Registered Member
 
Join Date: May 2007
Posts: 447
Country: United States
Quote:
Originally Posted by jkandell View Post
I do a lot of coasting in neutral. This has me a bit worried:
"An idling engine isn't operating at its peak temperature, which means that fuel doesn't undergo complete combustion. This leaves fuel residues that can condense on cylinder walls, where they can contaminate oil and damage parts of the engine. For example, fuel residues are often deposited on spark plugs. As you spend more time idling, the average temperature of the spark plug drops. This makes the plug get dirty more quickly, which can increase fuel consumption by 4 to 5 percent. Excessive idling also lets water condense in the vehicle's exhaust. This can lead to corrosion and reduce the life of the exhaust system."
idling-myths
I blasted my car to 6000 rpm yesterday twice! but then I did about a mile EOC. But the reason I did that was because I thought I felt the car sputter when it wasnt warmed up the other day leaving a parking lot. I used to tell people cars need to be DRIVEN, not babied to death. Give that thing some gas at least once in a while. But I am leaning the other way now, in the name of saving $$$ and helping the planet just a bit. So I will still stomp it at least once per tank....
__________________
slurp812 is offline   Reply With Quote
Old 05-22-2007, 06:26 PM   #10
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
A rev is ok as it tends to loosen up the engine a little works some oil to the top of the pistons and breaks loose any carbon in the combustion chamber - I usually rev it once a trip but not flooring it just a quick rev in first gear with light throttle.
__________________

JanGeo is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly API, Remote Update hufman Fuelly Web Support and Community News 6 11-26-2017 11:28 AM
Request: Days Between Fuel-ups artizhay Fuelly Web Support and Community News 5 10-30-2012 04:42 AM
Partial Fuel-up Calculations Improvements ryogajyc Fuelly Web Support and Community News 16 04-17-2012 09:25 AM
Why Is there No App?! muffetmd Fuelly Web Support and Community News 8 03-11-2012 10:06 AM
more fuel up options slineaudi Fuelly Web Support and Community News 4 07-02-2010 03:11 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:44 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.