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 :(

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Question about acceleration improvement.

There are zero options to "improve" the acceleration of the vehicle very simply because if such "options" actually existed Toyota would have already implemented them on the assembly line. That is who wouldn't want better acceleration? Toyota selected and tuned...

Q: Oil leak and bad lighting control module.

Lights flickering tells me that there is a poor connection somewhere. It could be as simple as a loose ground connection or a headlamp switch. I would ask for help from a certified mechanic to check your lighting system over...

Q: Turn signals not working - 1992 Mercedes-Benz 300

Hey there. The turn signal switch is disabled by the hazard switch. You should make sure to turn on and off the hazard switch and then test turn signals to see if they work properly. You may need to replace...

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...
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...