Q: 2003 Mitsubishi Outlander XLS: fixed oil leak, replaced gaskets on exhaust, intake, and cyclinder head. Car now idles rough/stalls

asked by on

Car had oil leak and code P0420. After cleaning the vehicle of Red RTV on all gaskets and replaced with new (exhaust, intake, cylinder head, exhaust pipe, throttle body gaskets; plus new thermostat, new spark plugs, new wires, changed oil & filter, flushed radiator, new coolant, new O2 sensors, & serpentine belt).

After finally cleaning oil spills on all parts and running vehicle to check for leaks no leaks exist. However, unless it is cold started the car runs on very low idle & eventually stalls.

When I put my OBDII scanner I acquire no codes. However, the following have come up the course of the month I have been working on vehicle:

P0102 P0107 P0113 P0335 P0420 P0506 P0507

As of today when I checked again none of these codes came up. The only ones I cleared a couple months ago were P0420 and possibly 1 other one but don't recall. The rest I never erased but they did not come up.

Is there a procedure for the car relearning proper idling?

My car has 99999 miles.
My car has an automatic transmission.

It is possible that you could have a vacuum leak. I would recommend having your vehicle smoke tested to determine where the source of the leak is. Perhaps the intake gaskets are not properly seared causing an incorrect air fuel mixture.

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. 2003 Mitsubishi Outlander XLS: fixed oil leak, replaced gaskets on exhaust, intake, and cyclinder head. Car now idles rough/stalls

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: The battery light comes on and the brake light comes on the dashboard lights go off the car starts to drive weird the gas hand goe

Based on what you are describing you might have a combination of electrical problems and, now, a "no start" problem. The first thing to do is get the car running. Then, if electrical problems remain with dash gauges, those can...

Q: Wierd rpm spike when coasting in vehicle.

Your car has an automatic transmission and will automatically downshift as the speed of the vehicle slows down. This spike in RPM's is just the downward gear spinning the motor up slightly as it downshifts. Nothing to worry about as...

Q: Q: Headlight going in and out

If you look inside of the socket for the bulb, you may find that the socket has melted. When this happens, the connection can become intermittent. I would ask for help from one of the mechanics at YourMechanic, so they...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.