Go Back > Urban Legends > Automobiles

Thread Tools Display Modes
Old 21 June 2016, 12:55 AM
jimmy101_again jimmy101_again is offline
Join Date: 29 December 2005
Location: Greenwood, IN
Posts: 6,912

Originally Posted by Malmensa View Post
Pretty sure this would depend upon the type of fuel injection system, how metering is implemented, type of transmission etc.

A partially blocked air filter restricts incoming air flow, a similar effect to limiting throttle opening. A vehicle with a very dirty filter at full throttle might have a similar air flow to one with a clean filter and 3/4 throttle. Thus it wouod just preform poorly. HOWEVER, most engines measure throttle position, and make some use of that information to determine how much fuel to inject, or what gear to be in. Most modern cars are closed loop and will determine from O2 sensor info how much fuel to meter, but some older cars have no O2 sensor. In a worse case scenario fuel requirements would be determined just via throttle position, so with a blocked filter, way too much fuel would be delivered. This, along with being in a sub-optimal gear could mean a noticeable increase in fuel consumption.
A partially clogged air filter will act as an obstruction in the air flow requiring more energy from the engine to suck air through the clogged filter. This would be independent of whatever the engine control system does to keep the fuel and air properly balanced and will (probably very slightly) reduce engine power per unit of fuel. (A car engine is basically an air pump that pumps air from the front of the car to the back. )
Reply With Quote

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 On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Urban myths fuel illegal immigration debate snopes Politics 1 03 July 2010 11:41 PM
Urban myths fuel 2010 fears snopes Snopes Spotting 0 03 October 2009 07:43 PM
Debunking Canadian health care myths snopes Politics 31 08 September 2009 06:03 PM
Democrats ruined the economy snopes Politics 11 18 April 2008 04:28 PM
Cicero on fixing the economy snopes Questionable Quotes 0 06 April 2008 07:23 PM

All times are GMT. The time now is 11:58 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.