Skip the auto shop - Our mechanics make house calls

Q: Bad gas mileage, engine misfire - 1992 Cadillac Allante

asked by on

My car has a mileage of 132,000 miles. I've been getting a really bad gas mileage. It's 11 mpg on average. The engine has been misfiring a lot as well. I had the car tuned up recently but there was no improvement in either whatsoever. What should I do?

There can be multiple causes, but it sounds like your fuel injection is injecting too much fuel into the engine for the amount of air it’s using. Faulty temperature, air flow, or oxygen sensors, a dirty throttle body or incorrect fuel pressure are some of the more likely candidates. A professional mechanic, like YourMechanic, can diagnose this for you and make needed repairs to all of these issues, including cleaning the throttle body and replacing the oxygen sensors.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Bad gas mileage, engine misfire - 1992 Cadillac Allante

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: It won't start.

The engine requires three things to run - Spark, fuel, and air. Unless there is a restriction in the air intake, air will almost always be present. fuel can be lacking for a number of reasons: 1. Bad fuel pump...

Q: 1999 Cadillac Escalade cranking, but not starting

Hello. There are a lot of possible causes of this. The most common being a bad fuel pump or crank position sensor. Both are very common. I typically start by checking the computer for codes with a scan tool and...

Q: Shifter loose transmission stuck 1992 Ford F150

Hi there - unhook the shifter from the transmission lever, and try to move the transmission lever to the Park position. If this is successful, start working your way back towards the shift lever on the column. Re-connect the cable...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...