Q: check engine light on, 1990 Subaru Legacy

asked by on August 24, 2016

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.

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?
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

Check Engine Light and emission light are on. Is the car still safe to use? - 2010 Hyundai Accent

The warning lights you are seeing are very generic. There is no way at this point of knowing if the issue is dangerous or not. You need to have the vehicle scanned for diagnostic troubleshooting codes ASAP. This can be...

P0420 code after idle relearn

Hi and thanks for contacting Your Mechanic. The P0420 code usually means that the catalytic converter has failed, however, it also relates to a mixture of fuel and air that is causing the catalytic converter to heat up too much....

I changed my spark plugs due to p0300 for 2013 infiti

Hello, thank you for writing in. The vehicle originally gave you a code for a misfire. It could have been caused by the spark plugs or a fuel problem. The second code pertains to a low fuel pressure being detected....

Related articles

B2110 OBD-II Trouble Code: Front Wiper Motor Relay Circuit Open
B2110 trouble code means there's an error in the front wiper motor relay circuit, caused by a faulty front wiper relay or electrical components.
Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
P2234 OBD-II Trouble Code: O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1
P2234 P2234 code definition O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1 What the P2234 code means Code P2234 is an OBD-II generic code for the Engine Control Module (ECM) detecting the O2 sensor signal wire...