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2005 Chrysler 300 2.7 ltr is getting 13 - 16.5 miles per gal

Tiny
CHRYSLER300GUY
  • MEMBER
  • 2005 CHRYSLER 300
? My 2005 Chrysler 300 2.7ltr MOH 24V DOHC has 27,000 miles on it. I have been on top of maintenance from the start.

1. Oil is changed every 3 months (approx. 2650 miles).

2. Tires rotated at every oil change

3. Transmission Fluid recently replaced during recall work.

4. Just had radiator flushed & cleaned

5. Replaced engine air filter when dirty. (Always more frequent than suggested)


Problem:

About 2 months ago I started to notice a drop in my fuel efficiency. I started to monitor miles per gallon and I have gone from 21mpg to roughly 15mpg.

To help with fuel economy (after noticing this change) I decided to purchase and install a K&N Filter that fits the stock intake housing. This has not improved the gas milage although I have noticed an increase in horsepower.

The PCV valve is due for replacement and I am going in this week to take care of it. I researched to see if this could be the problem for the fuel efficiency. What I found out is the PCV valve regulates engine pressure and is not directly related to fuel intake.

The does not suggest sensor replacement untill around 100,000.

I am stumped on what is causing the drastic loss in fuel efficiency.

What do you think the problem could be?
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Wednesday, September 6th, 2006 AT 11:31 AM

3 Replies

Tiny
JPAM
  • MECHANIC
  • 307 POSTS
Having a '05 with 27,000 it should still be under warranty. Though if you bring it and they do not find anything they may charge you for there time.
Also fueling at a diff. Station than normal could cause this.

Jess s
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Sunday, September 10th, 2006 AT 2:02 AM
Tiny
CHRYSLER300GUY
  • MEMBER
  • 18 POSTS
Hello Jess S,

I began having the fuel efficiency problem 2 months before switching stations.

I seem to have resolved the problem with the help of a few friends and co-workers by walking through and troubleshooting what the cause may be.

We came to the conclusion that my fuel injectors and spark plugs were dirty. We also concluded that the fuel filter needs to be changed.

Treatment:

1. Replace fuel filter

2. Use a super concentrate fuel system cleaner.

3. Combine concentrate of fuel injector specific cleaner with fuel system cleaner.

4. Replace PCV valve.

How we came up with diagnosis:

1. Engine runs smoothly

2. No overheating

3. No leakage from fuel lines

4. No stalling

5. No loss in power nor acceleration

6. No abnormal behaviour (clicking, screaching, etc.)

7. No smoking through exhaust

8. No oil leakage (gaskets, oil pan, etc.)

9. No loss in oil levels

10. Steady decrease in gas mileage.

I have so far only added the cleaners to my fuel sysem and I am already seeing big results.

I appreciate your input though and will continue to be open to your and or anyones future advice.

Thank You :D
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Monday, September 11th, 2006 AT 2:59 AM
Tiny
JPAM
  • MECHANIC
  • 307 POSTS
Well thanks for posting back. Dont know why I didnt think of that myself. I'm just triing to get back in the ZONE of answering these?'S Ive been off the site for most of the summer. Working long days over the road just couldnt get that much time to look at site. Now switched companies and home most nights. MORE time to answer?'S

well thanks again for reposting and keep up the good work posting answers youself.

Jess s
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Monday, September 11th, 2006 AT 3:22 AM

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