Q: 1999 Mitsubishi Eclipse running rich

asked by on April 11, 2016

My 1999 Mitsubishi Eclipse is running rich—minus ten percent long-term fuel filter. While cruising it’s even worse—minus 15 to 25 percent when at idle, causing low idling and stalling. My TPS reads 13 percent when closed and only reaches 75 when fully open. Could a TPS cause a rich position?

Car is stalling Inspection $94.99 - $114.99 Get a Quote

It certainly can. My experience with those Mitsubishis is that they have a lot of problems with the fuel injectors when they get old.

First, I would have a mechanic clean the fuel injectors. Sometimes, it’s that simple. Knowing Mitsubishi Eclipse, a lot of times, their main computers just go bad and they give the wrong data to the injectors and clog the system out. That often happens on Mitsubishis. If you need help getting this issue resolved, a technician from YourMechanic can visit your home or office to diagnose your car’s stalling issue to make sure that the correct repair is done promptly and effectively.

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

Crack in oil pan
Hi there. A crack in the oil pan will definitely cause a substantial leak on any engine. The most common leaks on this engine are the front and rear seals, but those are not typically too bad. If an oil...
Van leaking coolant
It sounds like there is a large coolant leak, especially if the system is loosing a considerable amount of coolant. The cooling system will need to be inspected for the source of the leak (https://www.yourmechanic.com/services/coolant-is-leaking-inspection). Many times the source of...
Car shakes when stopped
There is a problem common for other vehicles of your year and model where a failing engine mount (https://www.yourmechanic.com/services/engine-mount-replacement) can cause the vehicle to seem to vibrate or shake and leave an audible sound in the cabin as well. Another...
Automatic transmission issues, high RPM at low speeds
Hello, thanks for writing in about your 2000 Chrysler Cirrus. The transmission control module would need to be scanned to see if the codes stored may indicate the shifting problem you are having. You may have an internal shift solenoid...
Audi A3 won't start
Hi and thanks for contacting YourMechanic. The battery has lost all of the amperage that the battery can hold. I recommend replacing the battery (https://www.yourmechanic.com/services/battery-replacement) with a new battery and retesting your vehicle. If a battery voltage is too low...
How do you remove the pistons in the engine while the engine is in the car?
Hi there. You will have to remove the timing belt (https://www.yourmechanic.com/services/timing-belt-replacement), exhaust manifold, intake manifold, all vacuum lines, the cylinder head, and the oil pan to gain access to the piston removal. Drain out all of the oil from the...
2011 ford escape gear shift wont more from park to drive from time to time.
Hi there. The interlock solenoid in the shifter housing is not working and is causing the shifter to stay locked in the park position. This solenoid works with the brake switch. Check the brake switch and see if there is...
When i replace my radiator can i remove the condenser without replacing it and still drive my car with no problems? I
Hi Courtney. Thanks for contacting us today. I wouldn't recommend removing the condenser until you have the money to replace it. Everything is designed to fit correctly together. When you remove one component, other items will not work or fit...
Many oil questions
You can use 5w20, 5w30 or 10w30 oils in this engine. The lower numbers are for colder climates or winter months use 5w20.

Related articles

A Buyer’s Guide to the 2012 Mitsubishi Eclipse
2012 2012 marks the end of an era for the Eclipse and Mitsubishi sends the sporty little car off in style. As affordable sports cars go, the Eclipse has served its segment well with stylish looks, respectable performance, and a...
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 Lancer
If If you’re looking for a compact that delivers a sporty driving experience, the 2012 Mitsubishi Lancer just might be the right car for you. With a variety of models to choose from, including both a hatchback and high-performance option,...