How to check if EGR valve is working

macafee2 · 22nd July 2018, 12:24

Is there a way to do a manual check to see if the EGR valve of a Diesel is working?
Should I be able to push a plunger?

macafee2

sworks · 22nd July 2018, 12:31

A mityvac gauge could be used to operate the plunger but not many people will have one in their home tool kit. In some cases you can hear the engine note change slightly when it operates but the easiest way is looking at the maf readings to see a reduction as the egr opens.

Daveluck · 22nd July 2018, 14:10

Quote:

Originally Posted by macafee2

Is there a way to do a manual check to see if the EGR valve of a Diesel is working?
Should I be able to push a plunger?

macafee2

When you say test to see if it is working do you mean can you see the plunger going up and down?

Its been a while and my memory isn't what it used to be but here's what I think I did...

If you have the egr valve removed and in your hand on the bit that has the diaphragm in it there is a small hole. I took a foot pump with a football inflator, held it over the hole and then pumped the pump.

Now I can't remember if that opened the valve or closed it....it won't tell you if it is operating correctly ie at the right time but it will tell you of the valve is moving or not.

macafee2 · 22nd July 2018, 14:14

thank for the replies, I was wondering if I push a finger in if I could move anything.

i'll keep my fingers crossed its ok

macafee2

HarryM1BYT · 22nd July 2018, 16:19

They are vacuum operated, via a solenoid valve.

You might be able to suck on the pipe enough to move the valve to prove it works. If you suck, there should be no leaks from the diaphragm, even if you cannot move it by sucking. A good look at the valve should indicate whether it is closing properly. Putting a finger over the flexible pipe end, with the engine ticking over should prove the solenoid valve is opening.

22nd July 2018, 12:24	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,938 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	How to check if EGR valve is working Is there a way to do a manual check to see if the EGR valve of a Diesel is working? Should I be able to push a plunger? macafee2

22nd July 2018, 12:31	#2
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,070 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	A mityvac gauge could be used to operate the plunger but not many people will have one in their home tool kit. In some cases you can hear the engine note change slightly when it operates but the easiest way is looking at the maf readings to see a reduction as the egr opens. __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

22nd July 2018, 16:19	#5
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	They are vacuum operated, via a solenoid valve. You might be able to suck on the pipe enough to move the valve to prove it works. If you suck, there should be no leaks from the diaphragm, even if you cannot move it by sucking. A good look at the valve should indicate whether it is closing properly. Putting a finger over the flexible pipe end, with the engine ticking over should prove the solenoid valve is opening. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

22nd July 2018, 14:14	#4
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,938 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	thank for the replies, I was wondering if I push a finger in if I could move anything. i'll keep my fingers crossed its ok macafee2