Skip the auto shop - Our mechanics make house calls

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 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

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: Car not going over 20 MPH

Hello. If the car will not go over 20 MPH then there can be a number of issues going on. If the Check Engine Light is on then the computer needs to be scanned for codes first. If there are...

Q: Is having A/C refrigerant in the system a problem if my compressor doesn't work?

Having low refrigerant in a non-operative A/C system won't cause any problems. However, allowing refrigerant to escape into the atmosphere by opening a line, is detrimental to the environment. It's also illegal. Professionals evacuate and recover refrigerant from the system...

Q: Car only starts if started daily -- not letting it sit. 1992 Isuzu Pickup

Hello. You need to have the carburetor rechecked to make sure the choke is working okay and that the fuel is not leaking all out over a few days. This sounds like a carburetor is out of fuel or fuel...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...