Q: 1999 Mitsubishi Eclipse running rich and stalling at idle

asked by on

I have a 1999 Mitsubishi Eclipse. It's running rich and stalls occasionally at idle. I've done a fuel pressure test and it looked fine, which I believe can rule out a leak in the injector. There is no MAF sensor and the throttle position sensor is reading 13% at idle. What is my next step?

First of all, you’ve got to realize that, although those technically don’t have a MAF mass air flow sensor, those use what is called a Karman vortex sensor. Those sensors are notorious for going bad on Mitsubishis.

They do the same thing--they measure how much air is going into the engine to tell the computer how much fuel is going to put into a fuel injector. You will want a certified technician, such as one from YourMechanic, to come and hook up a high-level scan tool and analyze the Karman vortex sensor.

That can easily be what the problem is. If it is not that, running rich either means that you are getting way too much fuel, or you are not getting enough air. So, you’d want to check and see if you have any air restriction on the intake.

Something as pesky as an air clogged air filter can do that. You can also have a problem with the fuel filter. You might check it, to see if the fuel filter is clogged or anything like that. But, your throttle position sensor is reading 13% at idle. That is actually a little bit high. If it’s saying that it’s a little more open than it is, then the computer will send more fuel to the car and that will make it run rich. That a lot of times can cause that problem too. That’s a relatively common thing that happens to those cars. I recommend getting the car checked and having a qualified technician diagnose your stalling issue. That way, you can be more certain about what repair is needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 1999 Mitsubishi Eclipse running rich and stalling at idle

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: why wont it go anywhere once it is warmed up?

It is not clear from your description if this is an engine loss of power issue or a transmission malfunction. Your vehicle might be going into limp mode once warmed up. Check for any OBD-II stored trouble codes that might...

Q: Q: What is a throttle body filter

I'm not sure why you are getting the definition of "throttle body filter" for the code P0068. The definition I come up with is throttle body air flow performance. In fact, all of your codes are having to do with...

Q: I'm unable to start my car.

Hi there: There could be multiple issues going on your Toyota RAV 4 that could have caused it to stall and to not start now. The first thing that comes to mind is that you have a crankshaft position sensor...

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 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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...