Insuffient EGR Flow
Freshman User
Joined: Mar 2005
Posts: 28
Likes: 0
From: Yuma
same code but installed headers
i installed headers today and light came on. it was running fine until i installed em. i do have an exhaust leak i noticed. could that be the problem or should i try cleaning the egr??
Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
I have the same problems on a 97 4.6 with 191k miles. Where is the egr and what does it look like? Exactly what hose do I pull of and apply a vaccum to while the truck is idling? How do I apply the vaccum, I assume I probably shouldn't suck on the hose.
Thanks, any help is greatly appreciated!
Zach
Thanks, any help is greatly appreciated!
Zach
Freshman User
Joined: Feb 2005
Posts: 47
Likes: 0
it's on the side of the intake. It looks like a ufo, thats the best way i know how to explain it. With that many miles i would put good money on the ports being built up with carbon. I cleaned mine out when i had on 150K on my truck and the ports are about the size of the tip of my pinky finger. I could barely fit a paper clip in em. good luck
Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
well i pulled off the plastic cover and removed the air intake from the throttle body to check it out. What would I do from there? Unbolt the throttle body and then the ports are right there? How do u clean them? How do you keep the carbon from ending up inside the engine or somewhere important?
I changed my oil/filter, and my airfilter and sprayed throttle body / air intake cleaner on the first 2 electrodes immediatley behind the filter. Cranked the truck up the check engine light turned off and the truck ran very smooth and great. But when coming to a stop the rpms dropped to 500 the truck never stalled jsut the rpms droppin real low? What do yall think?
I changed my oil/filter, and my airfilter and sprayed throttle body / air intake cleaner on the first 2 electrodes immediatley behind the filter. Cranked the truck up the check engine light turned off and the truck ran very smooth and great. But when coming to a stop the rpms dropped to 500 the truck never stalled jsut the rpms droppin real low? What do yall think?
Elder User
Joined: May 2002
Posts: 778
Likes: 1
Hey,
when you remove the the throttle body and elbow together and turn it upside down, you will see two holes in the wall of the elbow. With the throttle body, the part that the throttle cable hooks on to pointed away from you, and upside down. The ports will be next to your tummy. The holes or lack of, will be most likely full of carbon junk. If you soak the the elbow to clean the ports, remove the egr valve, and the throttle body. The egr valve should be removed anyway to clean the ports wellllllll. Good luck.
Dave P
when you remove the the throttle body and elbow together and turn it upside down, you will see two holes in the wall of the elbow. With the throttle body, the part that the throttle cable hooks on to pointed away from you, and upside down. The ports will be next to your tummy. The holes or lack of, will be most likely full of carbon junk. If you soak the the elbow to clean the ports, remove the egr valve, and the throttle body. The egr valve should be removed anyway to clean the ports wellllllll. Good luck.
Dave P
Elder User
Joined: May 2002
Posts: 778
Likes: 1
Hello.
You have a throttle body, then a elbow thats between the throttle body and engine, intake. The elbow is about 5" wide by 8" long. It has the EGR bolted to it, the thing that is round, and has a tube that runs from the exhaust manifold to it, about 5/8 dia. with insulation on it sometimes. The elbow is the part with the port holes in it.
I wish i could put a picture up but i dont have a camera yet, and my daughters is hard at work.
Dave P
You have a throttle body, then a elbow thats between the throttle body and engine, intake. The elbow is about 5" wide by 8" long. It has the EGR bolted to it, the thing that is round, and has a tube that runs from the exhaust manifold to it, about 5/8 dia. with insulation on it sometimes. The elbow is the part with the port holes in it.
I wish i could put a picture up but i dont have a camera yet, and my daughters is hard at work.
Dave P
Thread Starter
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Senior User
Joined: Jan 2005
Posts: 356
Likes: 0
I got looking at this yesterday, Its gonna be pretty easy to do. I will take the tb and intake off as once piece that was suggested. I figure only and hour or two of work. Thanks guys for all your help and will let you know how I made out.
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Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
How long are the egr ports that I need to clean? Any tips/tricks on cleaning them? Should I clean anything else in this system while I got parts off and im working on it? I plan on doing this sometime this sunday and I will letcha know how it turns out.
Thread Starter
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Senior User
Joined: Jan 2005
Posts: 356
Likes: 0
Wanted to update you guys. Took the TB off 4- bolts, had it off in about 5 min's. Holy Cow! The carbon build up was unbelievable! Plugged is an understatement. I guess with 217000 miles I'd be plugged too. Just wanted to thank you guys for your help. The truck is now ready for another 200000 miles.
Thanks again
Thanks again
Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
Maybe i missed somethin on mine, but i pulled my TB off, 4 bolts 8mm. There was a ton of carbon on everything, i pulled out one hunk the size of a pingpong ball. But the TB isn't exactly what I need to take off is it? Is what I really need to take off, the elbow that the TB bolts to? That appeared to be where the EGR fed into. I only had about an hours time to do it. I knew the TB would come off in a couple of minutes, but I knew the other peice wouldn't be as quick in easy so I decided to save it for another day. But is that elbow that bolts to the intake the part that needs to be taken off and cleaned? or just the TB?
Thread Starter
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Senior User
Joined: Jan 2005
Posts: 356
Likes: 0
yes take the elbow off, all in one piece. Only took a couple of min's to do it. You have about 5 vac hoses, two electrical connections and unbolt the egr. take the 4 8mm bolts off the elbow and it comes right up. Very easy, took me about 40 min's for the whole project.
Elder User
Joined: Oct 2001
Posts: 724
Likes: 0
From: Cypress, CA
Sometimes I have been able to clean the ports with a piece of piano wire chucked up in a battery powered drill. Run the wire up and down and let it thrash around. Used a shop vac to suck out most of the crud.
Russ
Russ