running rough pt 2 codes
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Senior User
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running rough pt 2 codes
I checked codes and it came up as EGR valve !!I was told I have to clean the egr system and I have to remove the upper intake to do it right as the 5.0 is known for this any tips or suggestions as what to look for as I do this ??? or is it pretty straight forward thanx alot
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Joined: Jun 2006
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There are two reasons to get an EGR/EVP failure code. One, the EGR is stuck open or closed. Two, the sensor is shot. Either way, if the ECM thinks it should be open or closed, and doesn't see it, then it will issue the code.
Now, if you want to see something really scary about the upper intake, take a look at my gallery. This is apparently a common problem on this engine.
To clean/replace the EGR, no you don't have to remove the plenum. It's bolted right on the right side right next to the throttle body. It might not be a bad idea to do it though. It really isn't that bad a job. I did it my first time, and had it off in 1 hour.
Words of wisdom, though. If you're going to pull the plenum, go ahead and pull the injectors and clean them. Get a can of good injector cleaner, put the injectors in a bucket, and let 'em soak overnight. Get O-rings and go ahead and replace the ones on there. Lube 'em up with a little light grease to make them go back in easier.
Clean the throttle body as well as the inside of the intake. Pay particular attention to the IAC ports on the throttle body and the EGR port in the plenum while cleaning. Advance Auto had a complete gasket set for the job.
Search for "Plenum", and you'll find a rather large post I did about pulling the plenum, and testing for leaks, etc, before you set the plenum back on.
Chances are, your ECM has 'learned' to behave badly too. Disconnect the battery before you start the job, and leave it disconnected while you work. When you're finished with the job, the ECM will relearn good behavior. Disassembly will only take about an hour. The cleaning takes the longest. Make sure to check it good for fuel leaks before you put the plenum back on.
Like I said, check my gallery, and you may find part of your poor idle problem. A quick check to see if you need to pull the plenum, is to examine the seam where it bolts to the lower intake. If you see any oil/sticky accumulations around that seam, more than likely the gasket's shot.
This job improved my engine's running, but I still haven't cured a heavy throttle miss. I didn't thoroughly clean the injectors other than getting the crud off the outsides. This is why I suggested you take it a step farther than I did, and THOROUGHLY clean the injectors. Let them soak in a solvent overnight, rig up something to energize the injector, and blow air through them backward to remove anything the solvent loosens.
Now, if you want to see something really scary about the upper intake, take a look at my gallery. This is apparently a common problem on this engine.
To clean/replace the EGR, no you don't have to remove the plenum. It's bolted right on the right side right next to the throttle body. It might not be a bad idea to do it though. It really isn't that bad a job. I did it my first time, and had it off in 1 hour.
Words of wisdom, though. If you're going to pull the plenum, go ahead and pull the injectors and clean them. Get a can of good injector cleaner, put the injectors in a bucket, and let 'em soak overnight. Get O-rings and go ahead and replace the ones on there. Lube 'em up with a little light grease to make them go back in easier.
Clean the throttle body as well as the inside of the intake. Pay particular attention to the IAC ports on the throttle body and the EGR port in the plenum while cleaning. Advance Auto had a complete gasket set for the job.
Search for "Plenum", and you'll find a rather large post I did about pulling the plenum, and testing for leaks, etc, before you set the plenum back on.
Chances are, your ECM has 'learned' to behave badly too. Disconnect the battery before you start the job, and leave it disconnected while you work. When you're finished with the job, the ECM will relearn good behavior. Disassembly will only take about an hour. The cleaning takes the longest. Make sure to check it good for fuel leaks before you put the plenum back on.
Like I said, check my gallery, and you may find part of your poor idle problem. A quick check to see if you need to pull the plenum, is to examine the seam where it bolts to the lower intake. If you see any oil/sticky accumulations around that seam, more than likely the gasket's shot.
This job improved my engine's running, but I still haven't cured a heavy throttle miss. I didn't thoroughly clean the injectors other than getting the crud off the outsides. This is why I suggested you take it a step farther than I did, and THOROUGHLY clean the injectors. Let them soak in a solvent overnight, rig up something to energize the injector, and blow air through them backward to remove anything the solvent loosens.
