Question about 1997 Cadillac DeVille

2 Answers

My cars getting 11 mpg and my buddy has the same car and he gets 20 mpg my exhaust stinks like gas i think it needs new o2 sensors is that right?

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cadillac Master
  • 6,982 Answers

You may be correct, however you can have the same condition if the temperature sending unit has gone out of range or is unplugged, in which case the computer always thinks the engine is cold and therefore needs a richer mixture in order to run.
Before replacing anything though, have a code scan done and do some component testing using a chiltons manual and a digital multi-meter to check output values of those and other sensors. If you get an O2 code along with a different one, always do the O2 last as it will react to changes made upstream and can give false readings.

Posted on Jun 06, 2010

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 19 Answers

Yeah you may be right, it's more than possible. But i would also think about getting that exhaust checked out, because replacing sensors isn't going to help you gas milage. When dealing with something like this, you need to think about what has a problem that effects horsepower. So as far as your exhaust goes, it could be a messed up converter etc. I wouldnt know without looking at it. So if i were you, i would fix the exhaust first.

Posted on Jun 06, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2009 Infiniti M35 91k, Im getting really bad gas milg 19/20 MPG to15.7MGP, I did the full 90k tuneup with sparks plg & new tires. change the oil using 5w-30 Mobileone syn oil every 5k please help,


Is the check engine light on? Need to pull codes. Could be a bad o2 sensor or bad map/maf sensor or other problem. Code is the place to start.

Oct 30, 2016 | Infiniti Cars & Trucks

Tip

How to Replace the O2 Sensor in Mercury villager?


O2 sensor needs to be replaced when you get low gas mileage in car.
The procedure to replace is as follows: ----
1) There is primary and secondary O2 sensor connector.
2) Do the replacement of the O2 sensor only when the engine is completely cool.
3)You will see primary O2 sensor on the exhaust manifold.The secondary O2 sensor is located after the catalytic converter.
4)Put the car on jack stands on the rack, this will give you proper sensor location in the car.
5)Remove the O2 sensor with a socket wrench and O2 removal tool extension. Turn the O2 sensor counterclockwise to remove.
6) Most of the times the O2 sensor comes out very easily but if its bit hard to remove it then you can use "FREEZE spray" to make it gets loose.
7)The spray will make it come out easily.
8)When the O2 sensor is getting removed, some of the wiring's will also come out.
9)Before removing the O2 sensor, take the note of the wiring's and the position of wiring so while inserting new O2 sensor you don't get confused.
10) Now after you remove the old faulty O2 sensor out. Carefully insert new O2 sensor in same position.
11) And reverse/refit all the wires / parts which you removed while replacing the old O2 sensor.
This will help. Thanks.

on Mar 22, 2010 | Mercury Villager Cars & Trucks

1 Answer

Nissan xterra


p0456 was likely the gas cap, evaporative emission alert.

p1273
Either the exhaust is leaking or management needs reset.

'Clear the Self Learning Data' procedure. Anytime fuel component is replace, this procedure needs to be done. (exhaust emissions as well)

1. Unplug MAF sensor
2. Start car for about 3 seconds. Turn off car. confirm P0102 code
3. re-connect MAF sensor. Clear code. START car.
4. Run car for 10 mins.

Apr 01, 2014 | 2005 Nissan Xterra

1 Answer

Bad gas mileage


supposed, where did you get that idea>
city traffic has no upper limits for bad.
nor MPG, !

Aug 16, 2012 | 2007 Suzuki Forenza Sedan

1 Answer

I recently replaced my egr valve as well as one of my oxy sonsors, was getting 20-22 mpg for about 2 days after the replacments on the highway, now im only getting high 11 or 12 mpg. i have no lights on...


Sounds like the engine is running in 'limp in' mode, which should have turned on the check engine light. Take the truck to Autozone or a similar business to read out the computer for free. Also check the check engine light bulb at start-up--it should light as a test at that time. Suspect that the connections to the O2 sensor may have come loose or was damaged during the replacement. Hope this gets you running right again!

Feb 09, 2011 | 2005 Dodge Ram 1500

1 Answer

Dies going around corners and went from aprox 20 mpg to 10 mpg


only 20mpg when running right ??? try driving that car in europe ,anything under 50 mpg is no good to us ,anyway not sure entirely but i would check the mass air flow sensor first ,followed by the O2 sensors ,also the auto choke temperature sensor ,

Jan 08, 2011 | 1992 Buick LeSabre

2 Answers

I have a Honda Accord 2003, how can i fix a downstraem Oxygen sensor.. does this affect the gas cosumtion performance.. how can i fix this.. Help.!


o2 sensor is very important part to the engine when it come to the fuel economy. o2 sensor send information to the computer (ECU) which compute and calculate ratio of burnt exhaust gases. if the engine is not run properly either is too lean or too rich the o2 sensor will detect it as the car will triger the check engine light. you can drive the vehicle which will not hurt it as long you can tolerated the light however the car will get terrible gas mileage and poor performance as the ECU will try to lean the engine out itself. o2 sensor is fairly cheap to replace and fix. Let assume the car get 30 mpg on the high way, running with check engine light/bad o2 sensor will change the gas mileage to 18-25 mpg. If the car is V6 make sure you replace o2 on both side. good luck!

Nov 23, 2009 | 2003 Honda Accord

2 Answers

Why does my 1994 Honda Accord EX use to get 35-40 mpg and now gets 28 and down to 22 mpg?


Very often, sharply reduced mpg is caused by clogged or clogging fuel injectors. There are other possibilities, of course, but I would start by getting a good add-to-the-gas injector cleaner to see if that will make a difference. If it does (after a few days of running with it in the tank), you might consider having the injectors cleaned (many shops can do it without removing them from the car) more thoroughly.
Hope this is helpful.

Nov 15, 2009 | 1994 Honda Accord

1 Answer

Locate the 4 O2 sensors


You may only have 2 sensors. Follow the exhaust from the manifolds back. If there are four you will find them but I think you only have the two. Before and after catalyst, left bank and right bank if you have two converters.

May 01, 2009 | Dodge Ram Cars & Trucks

1 Answer

High mpg


ITS MORE THAN LIKELY ITS A SENSOR NOT JUST THE O2 SENSOR, MOST NEWER VEHICLES HEAVILY RELY ON INFORMATION FROM THE EXHAUST SO THE THE COMPUTER CAN AJUST THE SETTINGS FOR FUEL REGULATION, U CAN CHANGE MOST OF THE SENSOR ASSOCIATED WITH THE EXHAUST SYSTEM WHICH MAYBE 2 OR 3. THE EASIEST WAY AND MOST COST EFFECTIVE IS TO GET A DIAGNOSTIC OF THE BAD SENSORS THEN DECIDE ON THE BEST METHOD OF REAPIR

Aug 12, 2008 | 1999 Volkswagen Passat

Not finding what you are looking for?
1997 Cadillac DeVille Logo

Related Topics:

91 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8215 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...