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Author
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Topic: EGR
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BLUE
Gearhead Posts: 122
From: COLLINSVILLE, IL
Registered: May 2002
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posted 01-26-2003 09:32 PM
  
what exactly does the egr do. i am running my 94 f-150 i-6 with the vacuum line off of the EGR. when it is on it runs like crap. havent wanted to spend the $75 dollars on the new one. any ill effects with running the EGR with the vacuum line off besides the check engine light.
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mtucker
Journeyman Posts: 93
From: Wichita, KS
Registered: Oct 2002
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posted 01-27-2003 11:39 AM
Believe it or not, the EGR system lowers combustion temperatures and thereby produces less polutants.
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 01-27-2003 09:19 PM
Running without an EGR will change your A/F ratio. this will lead to a richer mix,unburned fuel,and eventually go to catylitic convertor failure. Why not just fix it right? That way,you will have a vehicle that will attain 200k,probably with ease. 
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BLUE
Gearhead Posts: 122
From: COLLINSVILLE, IL
Registered: May 2002
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posted 01-27-2003 10:55 PM
O.K. heres the deal, truck was running like crap at a steady speed(any speed as long as throttle was held at the same level)it accelerated fine. So when I parked my truck one day i heard a weird noise after the ignition was turned off. So, I popped the hood and it was the EGR making the noise, i pulled the vacuum hose off and took it for a spin and lo and behold the sputtering and bucking at steady speeds had disappeared. that's where i am at right now. In your opinion is this the sign of a bad EGR before i shell out the bucks?
Thank You
Jeff
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 01-29-2003 10:32 PM
Can you get a mighty vac to test it? It's probably a rupture in the diaphram. I think Autozone/Advance Auto Parts will loan you one. You may want to get a hold of a code scanner to make sure it isn't something else. [This message has been edited by MLariviere (edited 01-29-2003).]
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 01-30-2003 08:25 AM
What kind of noise?------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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BLUE
Gearhead Posts: 122
From: COLLINSVILLE, IL
Registered: May 2002
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posted 01-30-2003 11:03 PM
the noise kinda sounded like an old door hinge-weeeeeeeeeeeeeeeeeeeeeeeeeee. when i pulled the hose off it went phwishhhhhhhh. i am not trying to be funny really. anyhow it sounded like it was bleeding down slowly. the check engine light never came on until i ran with the vacuum hose off. would a bad EGR cause it to run rough when holding a steady speed. BTW i took it off to see if it was dirty and while i had it off i could suck the diaphram in and out so i dont think it is tore or has a hole in it, but it did seem weak it would move pretty easy when sucking on it.(again not trying to be funny, but i am sitting here laughing at myself)
Thanks for your help!
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 01-31-2003 11:31 AM
If you apply vacuum to it and hold it, does it stay retracted, or does it slowly return to position? That's how you check the diaphram portion of it. Sometimes you can pick up a resonance with a leaking diaphram. The EGR valve works by opening during cruising cruising speeds, and that allows exhaust into the intake manifold. This cools the temperature of the combustion inside the cylinders and this lowers emissions. If this opens too much or at the wrong time, it can make your engine run rough or even stall. In fact, you can test the EGR ports for blockage by open the EGR with your fingers while it is running and it should stumble and almost stall. I think your '94 has a pressure feedback electronic (PFE) EGR system. Do you have a scanner to check for trouble codes? I think your EGR sounds like it's ok, but whichever sensor actuating it may be out of whack. I have a manual on CD for my '94, but that damn thing always crashes my PC when I try to use it. I'll see if I can open it on another PC I have. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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BLUE
Gearhead Posts: 122
From: COLLINSVILLE, IL
Registered: May 2002
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posted 01-31-2003 06:43 PM
Steve thanks for the help, I dont have a scanner for my truck, the one my friend has is for 96 and newer OBD2 systems. I hate to just start replacing stuff til i figure it out.like i said before the light did not come on until hose was pulled, so would i have codes stored even though the light never came on? If you get that manual to work let me know. Thanks again Jeff
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 01-31-2003 08:41 PM
Yes,it will store trouble codes,even without the check light on.
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 02-01-2003 04:06 PM
Right, the trouble codes will be there until erased.This CD shop manual I bought is crap. Sorry. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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BLUE
Gearhead Posts: 122
From: COLLINSVILLE, IL
Registered: May 2002
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posted 02-02-2003 09:30 PM
O.K. i go to autozone today with egr in hand, they look it up on the computer and guess what, this "particular" part number is not available.(dealer item). so i ask him if he can test it, he pulls out a book and says no that one cant be tested, but he can test the EGR position sensor, it tested alright. while this was going on i had the battery disconnected, when i got home and hooked everything up like it should be so maybe tomorrow i will go to auto zone again and have them test the codes for me. i went up there tonite but they wouldnt do it because they were short handed. i still dont know if the egr is bad or not. i do know that it runs horrible with it hooked up, is there anyway i can test the codes myself with a needle type ohmmeter, i remember doing this to my 87 but it has been to long ago for me to remember.
Thanks again Jeff
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 02-02-2003 10:19 PM
I don't think you can,Jeff. The scanner has a chip in it,so it is processing alot of information. IIRC they are about $30-40 at the autoparts store.
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 02-04-2003 12:30 PM
I'd prefer the code reader too, because if you power up the wring pin you'll really have a bad day, but you can test with a voltmeter or test light. This page shows how:
http://www.dalidesign.com/hbook/eectest.html ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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BLUE
Gearhead Posts: 122
From: COLLINSVILLE, IL
Registered: May 2002
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posted 02-05-2003 06:11 PM
Hey guys i feel like a real a$$ but here i go. went to autozone yesterday they said they couldnt test my truck unless the light was on, said i needed a diagnostic test, alright whatever. went home and thought i would clean the IAC, took it off and it wasnt dirty. after that i am looking at vacuum lines for cracks and checking wire connections, when i decide to check the plug wires well what would you know a plug(#4) was loose!!!!!!!!!!!! i just put those plugs in 5000miles ago, but hey maybe i did forget to tighten one. now the truck runs like it should. now two more things i have had the hood open when it was running and never heard compression leaking(plug was loose but not ready to fall out) and why would unplugging the vacuum to the EGR override the loose plug and make it run better. anyway my dilemma is now over, thank you guys for your help.
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 02-05-2003 09:24 PM
 I don't know. Maybe creating an open air passage,or a Chrysler 300?  That plug backed out was probably creating a "lean out" condition in the intake,fouling that cylinder. Stopping the EGR circuit actually richened the engine,to smooth out the rest. [This message has been edited by MLariviere (edited 02-05-2003).]
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4Zsnow
Journeyman Posts: 51
From: Western Washington, USA
Registered: May 2002
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posted 02-09-2003 01:46 PM
Just FYI.
On the EEC-Iv system, you can ground the SINGLE wire that is part of the test port (it is not part of the "gang" plug but goes in the same holder labeled "EEC test")
Turn the key on after grounding and you will get a couple real quick flashes on the CHECK ENGINGE light (this means it is in diagnostic mode) a pause then it will start flashing the codes: flash flash...3 second pause...flash flash flash . is a code 23. If there are more codes, they will be separated by 6 second pauses. After flashing all of the stored codes, it will repeat this.
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