gas consumption off by 30% - Car Troubleshooting


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gas consumption off by 30%

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Paul Ginnetti
Anonymous Poster
Apairalypsenow2@aol.com

Mar 13, 2008, 11:09 AM

Post #1 of 5 (2583 views)

gas consumption off by 30%	Sign In

I have a 95 olds cierra, 3.1L 6cyl. I relaced 2 clogged fuel injectors and went through and replaced all suspect vacuum lines and the thermostat which had a weak spring. the compression test averaged 155-160psi on all 6 cylinders and the engine runs super strong. problem is i used to get 300-350mpg depending on city vs. highway and now get 220-240 average. What coud possibly be wrong and can the air/fuel ratio be adjusted manually to make a significant difference? Thank you.

Double J
Veteran / Moderator
Double J profile image

Mar 13, 2008, 11:20 AM

Post #2 of 5 (2577 views)

Re: gas consumption off by 30%	Sign In

Where can I buy one of these...300 miles per gallon...WOW>>

Seriously...
Many,many factors affect fuel economy..
Has the vehicle been tuned up...You replaced a couple injectors...
How about the spark plugs?
Start with a basic tune up,plugs wires,fuel and air filters,pcv valve...etc
Change the oil and filter.
Make sure all tires are inflated properly...
No,the air /fuel mixture is controlled by the computer and cannot be adjusted.
Have the computer checked for any trouble codes.

Thats a good starting point

Jim

Guest
Anonymous Poster
apairalypsenow2@aol.com

Mar 13, 2008, 1:03 PM

Post #3 of 5 (2573 views)

Re: gas consumption off by 30%	Sign In

Sorry about that......MPTankfull would have been more apropo, but I see you got my drift. Plugs were changed as well as wires , no codes thrown on diagnostic. It has coil packs which are all firing hot. What else could a tune-up provide except possibly a timing change? I mean the car jams when I punch the accelerator, no hesitation! Why so much fuel?

way2old
Veteran / Moderator
way2old profile image

Mar 13, 2008, 4:56 PM

Post #4 of 5 (2569 views)

Re: gas consumption off by 30%	Sign In

Mebbe fuel pressure regulator hung allowing too much fuel? What is the fuel pressure?

Being way2old is why I need help from younger minds

tcwagner
User

May 4, 2008, 10:50 PM

Post #5 of 5 (2532 views)

Re: gas consumption off by 30%	Sign In

dear GAs hog,
My mileage dropped from 20 to 12 and it was the O2 sensor. It got bent by a mechanic doing a "tune up". He apparently dropped something on it. When I got it back the mileage had plummeted and the exhaust pipe had soot in it.
Terry

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