99 alero bad mpg??

Reply

  #1  
Old 04-22-04, 08:00 PM
Member
Thread Starter
Join Date: May 2003
Location: minnesota
Posts: 93
99 alero bad mpg??

99 alero, my mpg is under 15 in town, it was not this bad before. I have had it checked out, air filter is fine. What can it be??? If it is just like this, how can I make it more gas economical with aftermarket parts??
2.4l 4door...........the engine too small for the car???
 
Sponsored Links
  #2  
Old 04-22-04, 08:01 PM
Member
Thread Starter
Join Date: May 2003
Location: minnesota
Posts: 93
also, only 42,000 miles on engine
 
  #3  
Old 04-22-04, 08:58 PM
Member
Join Date: Feb 2004
Location: So Cal
Posts: 248
A couple of possibilities come to mind:

Bad fuel injector(s) - dripping fuel.
Bad fuel pressure regulator - ruptured diaphragm.
Bad O2 sensor - failed lean causing ECM to command rich.
MAP or MAF Sensor bad if so equipped.

Is the Check Engine Light on?

Any other symptoms besides the poor mileage?
 
  #4  
Old 04-22-04, 09:04 PM
Member
Thread Starter
Join Date: May 2003
Location: minnesota
Posts: 93
no check engine light on,oil change light because oil change place never resets it!!, the car seems sluggish thats about it. We had it hooked up to a machine a few months ago and they said no problems showed up on the computer.....???
 
  #5  
Old 04-22-04, 09:13 PM
Member
Join Date: Feb 2004
Location: So Cal
Posts: 248
Sluggish could correlate to "rich" fuel condition.

Suggest looking for ruptured/leaky fuel pressure regulator diaphragm and/or drippy injectors.

It would be nice to know what the O2 sensor is doing and what the fuel trim stats look like if you can get someone to put a DSO on the O2 and scan the PCM for the fuel trim stats.
 
Reply

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


Thread Tools
Search this Thread
Display Modes