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

asked by on September 04, 2017

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.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

The car want move in gear After transmission replacement

2006 Ford Fusion new belt falling off

The most likely cause of the belt falling off would be a damaged pulley. It's possible that one of the police has been seized up due to lubrication in the bearing drying out. It's also possible that one of the...

PT Cruiser, replaced radiator and thermostat, dashboard gauge reads normal but car is running hot and having to add coolant daily

Hello, thank you for writing in. The vehicle is reading normal temperatures because the fluid temperature sensor needs to be in the fluid to give an accurate reading. The second there is a leak and the fluid level drops, that...

My a/c isn't blowing cold air.

The belt has to be on the compressor for the system to work. If you haven't already done so, installing a new belt will be a good first step and it may solve all your trouble. But if the air...

No Starting , neutral safety switch? 2007 Nissan Pathfinder

Hello - yes, I would agree. The neutral safety switch or possibly the brake light switch. If your brake lights work, the brake switch is not the issue. Check then the neutral safety switch. For assistance, I would recommend a...

What is causing my engine misfire?

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue, or in some cases a combination of both....

My alternator was just replaced. Now it's whining and locking on me! Why?

Check the transmission output shaft housing and make sure that it is not cracked or damaged. The vehicle speed sensor is located in the output shaft housing and controls the speedometer. If the housing is binding with the output shaft,...

Where does the vent line from front of the gas tank go?

Hi, thanks for writing in. The vent line or EVAP tube the comes from the gas tank is typically routed to the intake manifold. The intake manifold is where the air is mixed with the fuel before it reaches the...

the car will turn over but it wont crank

Hello...we can help you with that. If you have a good battery and your starter motor is turning over the engine rapidly enough, that means you have a problem in the area of ignition or fuel. That would includes things...

Related articles

A Buyer’s Guide to the 2012 Mitsubishi Outlander
The The smaller size and aggressive styling make the 2012 Mitsubishi Outlander a great choice for those who want an SUV, but don’t want to deal with some of the large behemoths available. With numerous tech options and all-wheel drive...
A Buyer’s Guide to the 2012 Mitsubishi Outlander Sport
If If you’re looking for an SUV, but don’t need much space or off-road capabilities, the 2012 Mitsubishi Outlander Sport just might be the ticket. With it’s stand-out appearance that is sure to be noticed, it provides the features and...
A Buyer’s Guide to the 2012 Mitsubishi i-MiEV
Cute Cute pretty much sums up the 2012 Mitsubishi i-MiEV. It’s a super compact electric car capable of driving for quite some distance on battery power alone. However, the lack of a gasoline engine means that you might not want...