2001 Ford Focus

Tiny
JOSELUIS2009
  • MEMBER
  • 2001 FORD FOCUS
  • 4 CYL
  • 2WD
  • MANUAL
  • 60,000 MILES
The inside of the car rattles parts of the dash just starts making noises when the car is stopped when you hit the gas it stops and also sometimes it turns off when you let go of the gas, it will start right up but it does that not everyday
Monday, March 16th, 2009 AT 1:28 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light and when was the last tune-up?

A rough idle or stalling. A large vacuum leak can lean the air/fuel mixture out to such an extent that an engine will not idle at all. An EGR valve that is stuck open at idle can have the same effect as a vacuum leak. So too can a loose positive crankcase ventilation (PCV) hose, a leaky PCV valve or the wrong PCV valve (one that flows too much air for the application). If somebody replaced the PCV valve recently, they may have installed the wrong PCV valve. The rough idle in all of these cases is caused by "lean misfire." The fuel mixture is too lean to ignite reliably so it often misfires and fails to ignite at all. Lean misfire will show up as elevated hydrocarbon (HC) readings in the exhaust, which may be enough to cause a vehicle to fail an emissions test. Check the idle air control valve and the throttle position sensor.
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Monday, March 16th, 2009 AT 8:36 PM

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