SPONSORED LINKS

2000 Mercury Marquis Engine Stumbles at 40 to 50 MPH

Tiny
JOSHLIN1932
  • MEMBER
  • 2000 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
When I am driving along and accelerate at most any speed, but especially aroung 40 to 50 miles per hour my engine misfires and stumbles along badly. Once it reaches higher speeds and in on cruise control it seems to run correctly.

It throws a code saying the problem is with the EGR, but it has been thoroughly cleaned from the air cleaner to the plentum. Has a new EGR valve and solenoid.

Can you please give me some ideas?

Thanks

John
SPONSORED LINKS
Saturday, September 18th, 2010 AT 4:37 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lack of acceleration, chugging, hesitating, jerking, bogging, misfiring etc. Could be caused by one of the following below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, September 19th, 2010 AT 11:40 PM

Please login or register to post a reply.

Related Engine Hesitate Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Hesitation
GUIDE
Hesitation
An engine hesitation is an interruption of continuous power during acceleration. When a engine is hesitating it will cause the car to lunge or surge which will cause a...
VIEW MORE

Sponsored links