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code 51 bad egr
Topic Started: Sep 12 2008, 08:58 PM (7,494 Views)
Sparky
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starscream5000
Feb 15 2010, 06:35 PM
Given your compression numbers. And a recent head job, and the amount of oil that your going through in such a short span of time, I'd say your head job was not done correctly. That or your have another oil leak somewhere. This may or may not be tied into your check engine light issues.

Hey Starscream, I appreciate your input along with the other guys. This engine has used some oil ever since I bought it when it had about 75000 on it. The oil consumption has increased very slightly since I did the head and it doesn't surprise me. It has a much stronger vacuum signal than it did before. Since cylinders 1 and 2 are burning very cleanly, and cyl 3 has some wetness on the plug I suspect that it's possibility an intake valve stem seal. It could also be simply a bad oil control ring. I'm going to doubt that this car was taken very good care of knowing the previous owner. (A youngster that didn't know a screwdriver from an impact wrench.)

In any case, in the morning when I check the passage from the EGR port to the bottom of the TB I will make the decision as to when to tear this sucker down and do a complete rebuild.

This brings up a question of all of you guys more familiar with this car and the parts situation. I am wanting to install moly coated rings if I can find them, or maybe just plain cast rings. I prefer not to use chrome rings since that requires a more complicated cylinder wall preparation. Is there a known source for moly rings? I suspect that I can get them from Total Seal Co if I give them the specs but I'm not sure.

What's the latest and greatest parts source?

Thanks
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Johnny Mullet
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Fear the Mullet

partsdinosaur.com

Also the other EGR port through the intake is like this..............

Posted Image
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idmetro
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Sparky
Feb 16 2010, 06:14 PM
idmetro
Feb 15 2010, 10:10 PM
Sparky
Feb 15 2010, 05:38 PM
Bad Bent
Feb 14 2010, 08:32 PM
Welcome to the forum, Sparky! :coffee

Today I also rechecked all the components for the complete EGR system. EGR SV valve, (ok), modulator, (ok) and the new EGR valve itself, (ok). I blew out all the passages (clean) and replaced all the vacuum hoses to each component. I still get a code 51 after about 10 miles of freeway driving.
In my case the EGR passage was clogged tight about an inch back from where it enters the intake manifold under the throttle body (about as far away from the head as you can get), every place else was clear. When you pull the EGR valve can you blow air through both ports?
Hmmmm, You may be on to something. I remember the first time that I blew air through the two ports covered by the EGR valve, I had good air movement back toward the exhaust manifold but no air movement through the other port opening. Like a dumbass I didn't know that it should have been open. I'll check that out the first thing in the morning. In fact, I think I'll take the throttle body off so I can see it from the other direction. I'm assuming that the passage leads to the area below the TB. Am I correct?

Thanks
You are correct that the passage empties under the throttle body. The only way I could get mine clear was to pull the throttle body and roto-rooter the passage from that direction as well. The carbon in the passage was so solid that I think i will get a spare manifold from the wrecking yard to clean up and have at the ready for the future.
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bogs
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Duct tape heals all wounds

JM, that is one DAMN informative pic !
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Sparky
Elite Member
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idmetro
Feb 17 2010, 11:37 AM
Sparky
Feb 16 2010, 06:14 PM
idmetro
Feb 15 2010, 10:10 PM
Sparky
Feb 15 2010, 05:38 PM

Quoting limited to 4 levels deepSparky!
Hmmmm, You may be on to something. I remember the first time that I blew air through the two ports covered by the EGR valve, I had good air movement back toward the exhaust manifold but no air movement through the other port opening. Like a dumbass I didn't know that it should have been open. I'll check that out the first thing in the morning. In fact, I think I'll take the throttle body off so I can see it from the other direction. I'm assuming that the passage leads to the area below the TB. Am I correct?

Thanks
You are correct that the passage empties under the throttle body. The only way I could get mine clear was to pull the throttle body and roto-rooter the passage from that direction as well. The carbon in the passage was so solid that I think i will get a spare manifold from the wrecking yard to clean up and have at the ready for the future.
OK! Everybody keep their fingers crossed. (I'm superstitious) I think I may have it solved. Idmetro touched on something that made me think of my first rule of diagnosis. As I had stated, I originally tried blowing through both ports under the EGR valve and had good air movement toward the exhaust manifold, but had no air movement toward the intake manifold side. Suffering from a brain fart I didn't associate that with a restriction. (go figure)

During my roto rooting I used a piece of inner speedo cable with a 3/16 L bend on the end to clean the passages using a 1/4 inch drill. When I rooted both directions the rooter had some resistance going through the passage up into the intake. When I buttoned everything back up, I also installed a different MAP sensor off a 95 model Metro. The rule that I mentioned above is that I NEVER try two things at once. I fooled myself by cleaning the passageway, and installing a different sensor at the same time. I guess that the different sensor was giving me another code.

This morning I removed the EGR and had good air movement under the intake, then I reinstalled my regular MAP sensor. So far, I've driven about 75 miles with no new codes. Like I said, keep your fingers crossed. (I know this makes it hard to type, or write, but do it anyway.) :cheers

I'll let you guys know what happens.

Thanks
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