Skip the auto shop - Our mechanics make house calls

Q: Low performance

asked by on

I own a 1992 Grand Marquis. Time after time my engine performance is getting lower and the car fuel consumption gets up. I can't keep up with speed even if I put my foot on pedal badly. I changed fuel, TPS, air cleaner, and spark plugs, and cleaned the MAF with a cleaner but my performance remains the same :(

A: Hi there, thanks for writing in. I'd be...

Hi there, thanks for writing in. I'd be happy to offer my insight. I would recommend checking the EGR valve and EVP sensor. The EVP sensor will tell the solenoid to open and send vacuum to the EGR valve. Right after it does this, it looks for a voltage change from the EVP sensor. If it does not receive the proper signal, it should trigger a fault code. You should have a check engine light on in your dash.

If you would like help with this inspection, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make any repairs as needed. The technician will also have a scanning tool to download codes that will help pinpoint the issue.

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・Save up to 30%

Get a quote

What others are asking

Q: Electrical problems with truck

The ignition key cylinder turns a mechanism in the steering column normally. If this mechanism breaks, then the ignition key cylinder will not turn the ignition switch. The steering column covers will need to be removed to find the broken...

Q: Car running rough

When your engine computer sees a problem with a major sensor or sees that an engine is misfiring, the computer will turn on the restricted performance statement with a red or amber light. The problem may be one of several,...

Q: Someone ran a red light and hit my left front corner causing me to run right into them as they were still in front of me

Your car has one airbag (dual-stage) in the steering wheel center, which you observed had inflated along with the dual-stage passenger air bag. Some models (GS) had the option of having side air bags, stored in the side of the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...