Question about 2002 Buick Century

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Idle is rough and using alot of gas. Replaced the EGR lastnight and it's still acting up. Any ideas?

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On the air intake hoss is a Mass Air Flow Sensor inline with the hose. Take a small peice of wood, 2 x4 prefferbly and rapp on the sensor 3 times. If the idle changes when you do this the sensor is bad

Posted on Jul 10, 2010

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Posted on Jan 02, 2017

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How do I correct high idle problem


Year/make/model??? Applying vacuum to the EGR and making the valve open will not be the correction. Once opened, this valve allows unburned exhaust gas back into the combustion chamber resulting in a rich mixture. The computer sees this rich mixture and reduces the injector pulse allowing the idle to slightly lower. If the vehicle were at proper idle speed and this valve is opened, it would run rough snd possibly stall

Jan 20, 2016 | Cars & Trucks

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I have a 2004 Chevy Impala. 3.4l v6. About two months ago, the fuel pressure regulator went out, and I forced it home. My mechanic replaced the fuel pressure regulator and said I had an EGR code, so I...


White smoke and foam in the gas tank indicates antifreeze leaking into the engine somewhere. Do you smell antifreeze? You may have an engine seal leaking, most likely head gasket. It may be affecting the various engine sensors.

Aug 23, 2013 | Cars & Trucks

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My 2004 escape has a rough idle.cleaned aic. No effect. Other ideas are trs, egr, or the cat. I would love advice before I start throwing a whole new truck in to my truck! Thanks!


First, is the check engine light on ? If it is you would have it scanned for trouble codes to hopefully get some clues.
A rough idle is usually caused by cylinders not firing or not producing power. And the check engine light should be on if that is happening.
A faulty cat would only cause the engine to load up. The EGR could cause a rough idle due to a vac leak but again it should cause the warning light to come on.
You could have something going on in the gas tank. 2003 was the last year Ford used a fuel filter outside the gas tank, so something could have clogged up the injectors.

Apr 09, 2013 | Cars & Trucks

1 Answer

Rough idle on a 1994 Ford Ranger


Get a full tune up, how is your gas millage? if your gas millage is bad then you should suggest changing your o2 sensors.

Jun 03, 2012 | Ford Cars & Trucks

1 Answer

Just replaced EGR hose & valve copver gaskets on 2002 Ford Escape 4WD. Did test drive, runs really rough & almost stops & cuts off. Any ideas?


OK, if you replaced the EGR hose, did you go all the way to change the EGR Valve? A stuck open EGR Valve can cause a rough idle and almost make it cut off.
Also, a vacuum leak on the EGR valve can cause a rough idle.

prev.gif next.gif Exhaust Gas Recirculation (EGR) Valve Removal & Installation 2.0L Zetec Engine NOTE: When the EGR tube is disconnected from the EGR valve, it must be discarded and a new EGR tube must be installed. The aluminum threads on the EGR valve must be inspected, and a new EGR valve installed if the threads are damaged.
To Remove:
  1. Disconnect the negative battery cable.
  2. Remove and discard the exhaust manifold-to-EGR tube. Use the following as a guide:
  3. Raise and safely support the vehicle
  4. Remove the splash shield
  5. Disconnect the EGR tube fitting
  6. Lower the vehicle
  7. Remove the air cleaner outlet pipe
  8. Disconnect the EGR tube from the EGR valve.
  9. Detach the vacuum line and remove the two retainer bolts.
NOTE: The EGR valve sealing surfaces are soft metals and easily damaged.
To Install:
  1. Installation is a reverse of the removal process. Carefully clean all sealing surfaces and install a new EGR valve gasket.
  2. Install a new EGR valve tube.
Detach the vacuum line (#1) and unbolt the EGR valve - 2.0L 02-04_escape_emissions_022.gif

3.0L (4v) Engine To Remove:
  1. Disconnect the vacuum line.
  2. Disconnect the EGR tube.
  3. Remove the EGR valve and discard the gasket.
NOTE: The EGR valve sealing surfaces are soft metals and easily damaged.
To Install:
  1. Installation is a reverse of the removal process. Carefully clean all sealing surfaces and install a new EGR valve gasket.
Detach the vacuum line (#1), unthread the EGR tube (#2) and remove the EGR valve bolts (#3) - 3.0L (4V) 02-04_escape_emissions_023.gif

Aug 02, 2010 | 2002 Ford Escape

2 Answers

1995 safari van w stalls when giving it gas. changed fuel pump and filter. replaced egr valve. sometimes rough idle. when it stalls just like you turned off key. then when you try to start it acts like it...


maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?

Sep 01, 2009 | 1995 GMC Safari

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