Q: My truck isn't idling right and is burging a lot of gas

asked by on

I have a 1995 isuzu pickup 2.3 l and I've been having some idle problem first my car wouldn't idle down after running for a while then it started to just run very rich. So this morning I started it up and it would not idle until l it was warm then I went out a little later and the idle was very speratic for a few minutes until the car shit down completely i read the trouble codes on it just on a whim and it read code 12 and 34

My car has 240000 miles.
My car has a manual transmission.

Code 12 will always flash when checking for codes. With the engine off, there is no ignition pulse so Code 12 is normal to see. Code 34 has to do with the MAP sensor. Manifold Absolute Pressure. It’s basically a vacuum sensor. The code can be set due to a failed MAP sensor or even a vacuum leak. A failed MAP sensor or vacuum leak can cause hard starting, rough or rich running, and even stalling. Vacuum leaks can be due to a broken or detached vacuum line, or even a vacuum leak within the power brake booster (if equipped with power brakes). If vacuum readings are all good and no leaks found, replacing the MAP sensor may resolve your issues. However, you may want to have a certified technician diagnose the fault code properly to be certain there is not another cause.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. My truck isn't idling right and is burging a lot of gas

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: I hear a clicking sound when I turn left.

It sounds like you may have a bad cv joint. I would recommend having a YourMechanic technician come out and diagnose the clicking noise and they can install a new cv joint one as well if that is in fact...

Q: overheating , stiff steering wheel and spilled anit-freze

It's hard to say what happened first, but the coolant tells a story of a leak. Of course a coolant leak can cause overheating, or overheating for some other reason can cause a coolant leak. You may have spilled coolant...

Q: Car slowly lost power

Hello, there are two possibilities for why your truck is doing this. The first possibility is that your catalytic converter is severely clogged. If this is the problem, the car will start, but once the catalytic converter reaches operating temperature...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.