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I have a 1998 mercury grand marquis and I am getting very little power accelerating. When I try to accelerate quickly I lose all power so I have to slowly accelerate and when I go up hills it will slowly cause me to decrease in speed and if I push on the gas too far it will not have any power going to the engine. Its running codes PO171 and PO174. Egr valve and DPFE sensor were just fixed. Coils and plugs were just replaced as well. What could be wrong?
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You have not shared what art of the country you live in, but I may be able to guess your answer.
All cars as old as yours are subject to brake failure, usually from leaking or rusted components.
A good inspection now should show you the rear brakes are bad, and perhaps the brake lines have rusted through.
Could also be a rear brake cylinder has failed, leaking out your brake fluid, and causing the brakes to give out when you needed them most.
Routine inspection probably would not have caught that, but having your brakes serviced every 7 - 10 years should have prevented it.
Lots of people do not do a complete brake service because it can get really expensive, though it would prevent your accident.
The acceleration problem is a whole different matter.
God bless your efforts.
easyautodiagnostics.com > Ford > 4.6L, 5.4L Dec 21, 2010 - Testing and troubleshooting the throttle position sensor (TPS) on your Ford ... No power as you accelerate the vehicle. ... Grand Marquis 4.6L,. 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004.
When you say the engine is hot are you talking about the normal operating temperature? Has the Check Engine or Service Engine light come? If so, was the On Board Diagnostics system checked for a codes? Usually a knocking sound during acceleration indicates a improper fuel mixture or low octane.
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