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GMC 4.3 won't idle clears up at 3000 RPM


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giddyuperic
New User

Sep 12, 2013, 6:51 AM

Post #1 of 5 (1228 views)
  post locked   GMC 4.3 won't idle clears up at 3000 RPM  

Hello I have a 1995 4.3 liter engine ran fine for years and ran fine Friday and then parked it next day won't idle but runs fine over 3000 RPM and it smells like exhaust really bad under the hood no check engine lights. And I can't find a regular EGR it has this electric big thing on the right backside of the TBI unit is that a electric EGR? Should I take that off and clean it? When I unplugged it the check engine light came on just don't??????? then turned the key off and it went away She had a new fuel pump and filet and that other stuff less then 7.000 miles ago. Could it big the IAC unit or is that a electric EGR valve that I am seeing on the right backside of the TBI unit??? I am lost and would take any help I can get I am disabled and can't afford to pay for it let a loan tow it some where. Please and thank you for your time. Eric from so cal


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 12, 2013, 7:00 AM

Post #2 of 5 (1224 views)
  post locked   Re: GMC 4.3 won't idle clears up at 3000 RPM  

That is the EGR. You can take it off and see if it is stuck open but you seem to be describing something worse than what an EGR valve would cause.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



giddyuperic
New User

Sep 12, 2013, 9:34 AM

Post #3 of 5 (1209 views)
  post locked   Re: GMC 4.3 won't idle clears up at 3000 RPM  

 Thanks I did not say but it smells really bad like exhaust under the hood when it is running if you want to call it that. And on the electric EGR it has part of it that you can see that is not dirty and every thing else around it is it is part of it that sits right up against the intake and it is silver you can move it a bit with a little pry bar I did not force it being that is a electric component. So what else could it be then. It was running fine perfect all day all the way tell I turned the key off that evening. Running great and then jump in it the next morning and it won't idle and sounds like it has a miss fire with the smell of exhaust and clears right up at about 3000 RPM and she had a tune up with a new fuel pump and filter 7.000 miles ago. Any help would be great. I am hoping it is some thing simple I am a disabled vet and only make so much per month and have to count my pennies to keep my head above water each month. Thank you for your time. Eric p.s. I found some hoses that were bad and replaced the vacuum hoses. Id the only EVAP can the one by the washer fluid bottle is that it??? Thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 12, 2013, 9:43 AM

Post #4 of 5 (1208 views)
  post locked   Re: GMC 4.3 won't idle clears up at 3000 RPM  

You obviously have no idea how an EGR valve works. You don't pry on anything. You remove the 2 bolts that hold it on and remove it to see if the pintle is fully seated.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



giddyuperic
New User

Sep 12, 2013, 11:33 AM

Post #5 of 5 (1198 views)
  post locked   Re: GMC 4.3 won't idle clears up at 3000 RPM  

 I know what it does it is a exhaust recirculating valve it put gas back in to the combustion chamber to prevent N02. I did not pry on it I just touch it to see it that was free and moving. I thought this site was to help people not be little them. I know about cars but I am not pro just enough to get by spent my life in the ARMY and I am a disabled ARMY vet and can't bend over the hood for more then ten minutes at a time so this is very hard for me and I was just trying trying get a little help. I am not that dumb to pry on any thing poor choice of words I know I have to take it off and put node light on it and see if it has power and power it up to see if it working. Maybe there is carbon holding it in the open or not. I don't know enough about the electric ones I know that you can just pull up on reg one and see if the car stumble's or put a vacuum pump on it and pump it up that way to but I don't know any thing about the electric ones so I guess I will just have to take it off and go from there.






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