Car is idling rough sometimes, had it on a machine that said it was the egr valve we put one on and it is still idling rough at times said either egr valve faulty , blocked egr passage egr boost sensor malfunction or egr solenoid malfunction. My husband put the new one one could there be something that he did not do that he should have when he put the new one on

If the EGR valve was stuck open it wouldn't idle at all ! That's the only way an EGR valve could be a problem at idle , EGR valves are not energized by the PCM - engine computer at idle . EGR valves operate at speeds higher , highway speed to deceleration . Getting off free way . You have an IAC valve problem ,idle air control valve . Or possibly a TPS - throttle position sensor Or a vacuum leak (intake manifold ) Or maybe a mass air flow sensor or some other sensor . Don't listen to peoples suggestions , you'll only spend a bunch of money on parts an still have the same problem . Do yourself a favor an take it to a qualified repair shop !

Spark Plugs have to be changed every 3 years
Front Oxygen Sensors changed every 100,000 miles
Can't have any Vacuum Leaks -- anywhere on the vehicle
Need to have it road tested with a Professional Scan Tool
& look at all data & get caught up on Preventative Maintenance
Very few people change motor oil 3 or 4 times a year, if at all,
and the Variable Cam Actuators fail, as a result,that & few other
things can cause rough running engine & resulting idle issues
It's well known that Ford COP Ignition Coils fail sometime in
every year of ownership

I actually had to replace my EGR valve and the gasket. I clean the valve well and reused both. I don't think the gasket sealed well enough though. So I went ahead and got a new valve, gasket and changed them. It runs a lot smoother now.

SOUND LIKE BAD EGR VALVE.IT WILL CAUSE ROUGH IDLING AND STALLING OUT ENGINE WHICH WILL CONTAMINATE OXYGEN SENSOR WITH RICH FUEL MIXTURE.

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?

The most common problem is a clogged EGR valve. In any case, you should take it to a mechanic who has the tools to diagnose it further, because 1/2 a dozen things can cause rough idle in a 10 year-old Windstar.

he EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

Sounds like it may have a bad EGR valve, or no vaccum to it

i would still try to change your egr!!! sometimes egr test good but still they can stick open and that can cause idle problems so if you want to get your prob fix change egr valve
take that egr off and put in a new one !!!!

Have a great day

Denis

This make/model has a chronic problem with EGR clogging. If you have a dashboard indicator showing "check engine" most likely it is a trouble code indicating and EGR (exhaust gas recirculator) valve problem. Symptoms are rough idle, and surging and stalls.

What happens is sediments from the exaust manifold get sucked up into the valve when it opens, then stick in the valve and keep it from closing. When the valve is open when it should be closed, the engine runs very rough.

I removed my egr and then dislodged the sediment (pea-sized debris) and then re-installed the valve. Three days later, the same "check engine" and same rough idle. I must have did this at least three or four more times.

What I found that gave me a permanent solution was an aftermarket filter gasket that keeps debris from clogging. I don't remember the name of the product, but a search for "EGR filter gasket" may lead you to the product.

Install the gasket between the EGR and the exhaust manifold and you should be good to go. Note: on 1995 and newer models, disconnecting the EGR from the wiring harness (common on R&R) may require the computer to be reprogramed.