Question about 2003 Ford Focus

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2003 focus with rough idle and tach surge. No code yet although problem been there a couple weeks. Took the vacuum hose off the egr valve and rough idle/surge cleared up. Pending problem on obdII still there. Vacuum hose had suction at idle. Maybe the pressure switch the problem?

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Carbon build up in the egr passages and the hose is collapsing

Posted on Mar 04, 2010


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Cleaned throttle body on chevy 03 1500. Now has high idle about 1200 rpm and surges up and down?


Check the following in order:

IAC valve wiring, connectors and vacuum hoses.
Look for vacuum hoses that are not connected in general.
EGR valve wiring, connectors and vacuum hoses.
PCV system.
Wiring to the two sensors in the air intake.
Check position of the air intake for leaks. Tighten its screws.
Check wiring in general.
Do a code scanning if you have not found anything so far, check wiring of ECM and O2 sensors.

If the car idles up and down there may be an air leak from air intake or IAC, EGR, there may be a vaccuum leak or PCV system may be malfunctioning. Those are the things to check first and with more attention.



Sep 19, 2011 | 2003 Chevrolet Silverado 1500

1 Answer

Car idles rough & wants to stall intermittantly. will run smoother with a/c on-then turn a/c off and will almost stall. Have just replaced the O2 sensor on the exhaust manifoild by the radiator for...

You have 2 faults going on this is common failure patter a idle air control and egr open, the 02 sensor was not at fault it was reporting the engine condition and had nothing to do with the stalling listen to the engine you may find a vacuum hose rupture follow it along the pcv valve you mainly have a vacuum leak or a open egr

Aug 07, 2011 | 2003 Ford Focus

2 Answers

My 2002 Mercury Mountaineer idles rough, I changed pugs, coil and also took it to 2 different mechanics. Recently the code came on for P1400 . . .Im just wondering can this be the cause of the rough idle?

Hi, if your EGR valve is stuck open, it could cause a rough idle. P1400 indicates there is a problem with the EGR flowmeter. This may be the result of a valve that is stuck open or may be the cause or may be unrelated. What I recommend is to first check the vacuum hoses on the sensor/flowmeter and also check the hoses from the EGR solenoid to the EGR valve and from the intake manifold to the solenoid. If those are good, remove the EGR valve and inspect the EGR passages for blockage. Also check the valve for properoperation. The valve should default closed and open when engine vacuum is applied to the vacuum port. If you cannot find anything wrong, with the valve or passages, test the control solenoid that supplies vacuum to the EGR valve. It should click open when you apply 12 volts to it. If all this is good, check the wiring from the flowmeter to the computer for continuity. Please let me know if you have questions, and thanks for using FixYa.

EGR valve:






Aug 03, 2011 | 2002 Mercury Mountaineer

4 Answers

Have a 1995 ford contour and took it to pepboys and they got multiple codes. One of the codes came up twice code 332 says egr valve not opening could this cause all the other codes? My husband has checked...

DTC P0332 is for a knock sensor, not egr valve. That's not to say one of the multiple codes you've mentioned wasn't for the egr valve.

What are some of the characteristics the vehicle is showing. By the way, what is the vehicle? In one place it says 1995 contour, in another it says 1995 explorer.

Jan 03, 2011 | 1994 Ford Explorer Limited

2 Answers

Idles really rough and today it died while I was stopped at a stop light . Had the codes checked about a week ago and was told my egr valve was bad and needed to be replaced .. I replaced it and it lasted...

There are several codes that can be set by the EGR system. EGR valve failures on Fords are very rare. There is usually something wrong with the EGR Control Solenoid, The EGR ports clogged up, The DPFE sensor (the sensor that monitors the EGR system) or the vacuum lines between the intake manifold and the control solenoid or between the solenoid and the valve.

Fault codes NEVER tell you what parts to replace. They only tell you which engine management system is failing to function properly. Anytime there is a fault code the system has to be diagnosed to find out what is causing it to not operate like it should. You can spend a lot of money on parts and not fix your EGR system if proper diagnosis is not performed.

If the gasket for the EGR valve is leaking it will cause your engine to idle very high and will cause the computer to set "lean O2 sensor" codes. If this is not occuring, it is safe to assume that the EGR gasket is not a problem.

There are many things that can cause your engine to die at a stop light. Everything from a loose battery terminal to a failed computer module to a bad ignition switch, to a malfunctioning Idle Air Control (IAC) valve or an intermittent problem with a Crankshaft Position Sensor. I would recommend having it checked out by a professional if it continues to be a problem.

Dec 19, 2010 | 2003 Ford Focus

5 Answers

My 04 f150 had a rough idle and would sometimes stall out. dealer said it was throttle body so I replaced. The idle is still rough but it it doesn't stall. Could it be a coil pack? if so do I need to...

I have a 2005 f150,with a 4.6 and it idles rough and when you turn on the ac it wants to die. Checked the codes and there are no codes.Any suggestions?

Apr 30, 2010 | 2004 Ford F150

2 Answers

2003 Lancer rough ildle

ts runing high 2300 check the vacuum with a gauge and unplug egr lines ..egr could be plugged ..oxy sensor could be open loop running rich...tps ar air flow meter ...

May 08, 2009 | 2003 Mitsubishi Lancer

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