Vacuum

Jeff7477 · 07-06-2001, 12:15 AM

After I was done replacing my EGR valve, i thought i would check to see what kind of vacuum it needs. i started the car and let it idle. I put my finger over the Vacuum line and didn't feel much. I gave it a little throttle and could feel a little pull on my finger. I then pulled the line off the Fuel Pressure Regulator and put my finger over it. At idle it had enough to keep my finger stuck on it. Had lots more pull than the EGR vacuum. Should it be this way, or is there a vacuum problem somewhere?

Jeff7477 · 07-06-2001, 08:13 AM

Anyone?

jimberg · 07-06-2001, 10:27 AM

The EGR valve has controlled vacuum. It should only be open at part throttle. There should be zero vacuum at idle. If you do get vacuum, the EGR vacuum solenoid is not working correctly.

The fuel pressure regulator has uncontrolled vacuum. It's active all the time.

------------------
351W 89 Mustang GT Convertible

JRowlette · 07-06-2001, 05:53 PM

Do you happen to know where the EGR vacuum solenoid is located?? Is it in the passenger side fenderwell??

jimberg · 07-06-2001, 06:40 PM

It's on the backside of the passenger side strut tower. There should be a group of three. One on top and two on bottom. It may be different on your car depending on the year. You can just trace your vacuum back from the EGR. It should just go from EGR to a vacuum tree and then from the tree to the solenoid.

------------------
351W 89 Mustang GT Convertible

07-06-2001, 12:15 AM	#1
Jeff7477 Registered Member Join Date: Jun 2001 Location: Lincoln, Nebraska USA Posts: 67	Vacuum After I was done replacing my EGR valve, i thought i would check to see what kind of vacuum it needs. i started the car and let it idle. I put my finger over the Vacuum line and didn't feel much. I gave it a little throttle and could feel a little pull on my finger. I then pulled the line off the Fuel Pressure Regulator and put my finger over it. At idle it had enough to keep my finger stuck on it. Had lots more pull than the EGR vacuum. Should it be this way, or is there a vacuum problem somewhere?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
351W crankcase evacuation	jse9	Windsor Power	19	09-03-2004 12:00 AM
Performer RPM	-RootS-	Windsor Power	4	04-25-2003 06:24 PM
Still Misfiring	MidNiteBlu 5.0	Windsor Power	17	12-02-2002 09:43 PM
Need vacuum advise before I start the engine tomarrow-please help	Stang_ROTY	Windsor Power	12	07-23-2001 12:41 PM
The benefits of a Vacuum Gauge!!!	PKRWUD	Windsor Power	16	07-02-2001 09:12 PM

07-06-2001, 08:13 AM	#2
Jeff7477 Registered Member Join Date: Jun 2001 Location: Lincoln, Nebraska USA Posts: 67	Anyone?

07-06-2001, 10:27 AM	#3
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	The EGR valve has controlled vacuum. It should only be open at part throttle. There should be zero vacuum at idle. If you do get vacuum, the EGR vacuum solenoid is not working correctly. The fuel pressure regulator has uncontrolled vacuum. It's active all the time. ------------------ 351W 89 Mustang GT Convertible

07-06-2001, 05:53 PM	#4
JRowlette Registered Member Join Date: Apr 2001 Location: Bowling Green, KY Posts: 95	Do you happen to know where the EGR vacuum solenoid is located?? Is it in the passenger side fenderwell??

07-06-2001, 06:40 PM	#5
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	It's on the backside of the passenger side strut tower. There should be a group of three. One on top and two on bottom. It may be different on your car depending on the year. You can just trace your vacuum back from the EGR. It should just go from EGR to a vacuum tree and then from the tree to the solenoid. ------------------ 351W 89 Mustang GT Convertible