Skip the auto shop - Our mechanics make house calls

Q: check engine light on, 1990 Subaru Legacy

asked by on

Loses power when going long steep hill. Sta.wagon has slightly strong fresh gas emissions. Replaced knock sensor, spark plugs, oxygen sensor, cleaned mass air flow sensor. Replaced fuel injectors.

My car has 140000 miles.
My car has an automatic transmission.

A: Hi there, thanks for writing in about your ...

Hi there, thanks for writing in about your 1990 Subaru Legacy. You need to have the fuel pressure tested to see if the fuel pressure is within specifications and will hold pressure after testing with engine off. The fuel pressure regulator may be leaking excess fuel into the [intake manifold causing it to run rich. Scan the computer to access codes and diagnosed them as needed. Make sure there is no leak in the intake hose between the mass air sensor and the throttle body. If you need to have this done, a certified technician from YourMechanic can come to your home or office to inspect the Check Engine Light and let you know what should be done.

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: Blowing fusible links

Hello there: In most cases, when a fuse relay continues to break, it's an indication of an exposed wire that is causing a short circuit situation or a poor ground. As issue like this can be difficult to pinpoint, the...

Q: When you slow down then re-accelerate..sounds like severe downshift.

This is a sudden acceleration that some fly by wire vehicles have been suffering from. Think of the Toyota Prius. Your throttle is electronically controlled and the PCM (Powertrain Control Module) takes a position reading from your foot pedal to...

Q: The vehicle rides rough and there is a loss of power

Your vehicle has only 69,000 miles and so you want to make sure that the ball joint(s) has actually failed. So, best to either get a second opinion and have the Mechanic demonstrate the failure to you so you can...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...