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EGR Valve?

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If the EGR valve is not opening the exhaust gas will not recirculate and will form oxides of nitrogen Nox to increase due to excessive combustion temperature over 2500F deg
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
ROCOCO71
  • MEMBER
  • 2 POSTS
  • 1987 FORD BRONCO
  • 2.9L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Where is the EGR valve located on the vehicle listed above Bronco 2?
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
I have never seen a egr stuck closed that would make the engine run rough, now if it stuck open then it might not even idle at all, as far as hi combustion temp yes this is true but it only rises under a load or constant hi idle and when this happens it makes this sound we old timers like to call spark nock, this is what an egr gets rid of. Keep in mind this is a 1989 truck.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
It's up on the intake manifold. It will look like one of these animals in my picture below!

The Medic
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Detonation/pinging/spark knock all smells the same- High NOx is normally caused by an EGR problem. And Yes I've seen it shut closed in my 43yrs in this business. Open or shut closed you gonna have a problem

TO: Rjohnsn Clean out the EGR valve this is the only way to find out and make sure its functioning correctly- BTW You sure the vac hose is hook-up to the correct type vacuum such as ported/VV/intake
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
Your dogging me and then telling him the same thing I allready told him to do. And buy the way I told him in laymens terms. You need to look at my replies and maybe his to, he says in his massage and I quote-(hopefully just cleaning the EGR valve) would fix it.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
By the way rasmataz we have all seen a stuck egr valve. Nobody ever said they dont stick. And just cuz you claim you have been in the business for 43 years dont impress me ive seen certified tecs that dont know a screwdriver from a hammer!
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
PAUL75
  • MEMBER
  • 8 POSTS
  • 1986 FORD BRONCO
I have recently put on a new Distributor Cap, Rotor, Plugs and Plug Wires on my 1986 Ford Bronco II 2.9L FI 4X4. And the same night I had done this after I started it the emission light has came on and will not go off if I try to reset the computer, I had someone run a scan on it and they could not complete the scan because it wouldnt complete the test without dieing on him so I took a shot in the dark and replaced the EGR Valve and it did no good. If anyone out there has ever experienced this before please let me know what could possibly be the problem. It would be deeply appreciated. Thank You!
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
LOVESCARS
  • MECHANIC
  • 359 POSTS
Ignition control module possible have it tested
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I have never seen a egr stuck closed that would make the engine run rough: It won't-but will increase the Nox and cause it to detonate/ping-like throwing marbles in a tin can-

When he comes back you take it from there-No I'm not trying to dog you, its my job as Sr. Moderator to assist, we work in here as a team-When it gets tough we moderators/experts will link-up and answer the question paid or not-
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
PAUL75
  • MEMBER
  • 8 POSTS
I considered that could possibly be it but if it were bad at all I dont think it would start.I may be wrong but just thought that.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
Dude why do you keep saying things I have allready said? Are you reading what your typing. Dident you read the part where I said thats what us old timers call SPARK NOCK!And thats only under load. If working proper it closes at idle(no vac)opens at throttle(vac)if letting gas pass by then you get high nox& bad ilde. Its just an egr valve omg. P.S this man just needs to clean the egr valve and check the vacuum solenoid.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
LOVESCARS
  • MECHANIC
  • 359 POSTS
Agreed with the not starting
Did you try easy items like the fuel filter, Pcv valve, look for loose or cracked vacuum hoses?
Could be the brain too. Start with replacing the small ticket items. Bring the vehicle to a local part store autozone they will hook the vehicle up on a computer diagnostics.
Another thing to do is utilize this site there is a whole list of topics on the left side
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Okay dave's big backyard!We end this and move on maybe he wants us to clean it up for him or he already did and not coming back but he's getting our replies-Sorry Buddy just trying to help it shouldn't go this far-BTW welcome aboard looking forward of you being a moderator/expert
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
PAUL75
  • MEMBER
  • 8 POSTS
I had went to autozone and they told me that my bronco was to old for their diagnostic testing machine so I ran into a man that had a testing device made by Snap On and he tried testing it for me and it has to run through I think like 13 steps and during the 6th step the device puts a strain on the engine so that the throttle should raise to compensate for the strian but the engine dies. And all he told me was that I need to find out what is causing it to die before he can complete the test and diagnose what is wrong.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
All is good with me, hope you feel the same way.P.S sorry for being such an ass.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
SCOTTIE POPPADOPOLOS
  • MEMBER
  • 1 POST
  • 1986 FORD BRONCO
  • 6 CYL
  • 4WD
  • MANUAL
  • 156,000 MILES
My bronco II starts good runs for about 20 minutes then sputters and eventually stalls. Not my fuel line, I have replaced fuel pumps, filters
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
LOVESCARS
  • MECHANIC
  • 359 POSTS
Sounds electrical in nature need to find out if it's cutting out before or after distributor.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
If there is a problem with the EGR, it will be caused by carbon. Just chip away at the carbon to remove it. Also, makes sure where it attaches to the intake to make sure it isn't plugged there.
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Friday, July 17th, 2020 AT 12:05 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hey Np -this is how I pick a future moderator and submit their names to higher ups-got any problem with it-if not you'll be notified.

Your status now is helper. Mike@2carpros. Com will need more info send him a message-let me know
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Friday, July 17th, 2020 AT 12:05 PM (Merged)

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