[SOLVED] S10 EGR... again!

Raylo · 05-30-2008, 02:02 PM

Well, it's acting up (sticking open) again. This for a code W CPI 4.3 Vortec V-6. According to Haynes there were several types of EGR and the one for my code W is not what I am used to seeing. It's unusual, and unusually expensive.

Thanks to a tip in the excellent step-by-step procedure below I was able to confirm my diagnosis. I took a ratchet extension and banged on the EGR housing. The idle immediately settled down into its smooth old self.

Anyway, anyone with this motor might want to peruse the link below. Good info.... but I don't think the pictures will come up unless you register for the site. I was already a member.

I'm going to live with mine for awhile and see how it goes before springing for a new one.

http://www.s10forum.com/forum/f201/e...-how-to-18667/

**mack1** · 05-30-2008, 03:08 PM

Hi Raylo,

Quote:

but I don't think the pictures will come up unless you register for the site.

You were right, you can't see the photos without membership.

Too bad you can't just clean the thing up and oil it.

Best wishes,
Mack1

Raylo · 05-30-2008, 03:50 PM

Actually Mack I may just try that. Or since this is OBD-I I may just get 2 gaskets and sandwich in a piece of galvanized sheet metal to block the ports. I am not getting a code so all should be good. Might not work with OBD II vehicles.

Here is one of the pictures from that website that shows the old and new EGR valves with the old being clearly stuck.

**mack1** · 05-30-2008, 04:18 PM

Hi Raylo,

You're probably right about the codes just showing up in OBD II. The engine will likely run just as well. The whole idea about reburning exhaust gas deals with emissions as I understand it. Not a thing that was done on the older cars that I grew up with.

Best regards,
Mack1

Raylo · 05-30-2008, 04:25 PM

Yes, it is emissions and has an effect on mixture and combustion temps. I suppose taking out the bit of exhaust might make it run a tad rich until the computer gets feedback from the O2 sensor and learns and adjusts the injectors to compensate. It'll probably cause one of the pollutants to go up a bit but not enough to matter.

Heck, after I banged on it it might be OK for another year or 2 anyway. ;-/

Raylo · 06-16-2008, 05:46 AM

Got to working on this problem this AM. It's worse than I expected. I looked at the EGR valve and one of the 2 mounting bolts was cross threaded into the aluminum intake manifold and only inserted half way. So the EGR was only tight on one side. Even if it wasn't sticking there was probably a vacuum leak there. Pep Boys (in FL) work.... gotta love it. I need to pull the a/c compressor out of the way to get access to run a tap through the hole. It looks like the rear half is undamaged so I may not have to helicoil. And they ask why I do most of my own work on my cars??

**mack1** · 06-16-2008, 06:22 AM

Quote:

And they ask why I do most of my own work on my cars??

Hi Raylo,

Gotta do it yourself if you want it done right. I haven't put in a helicoil in a long time. Don't like them, but they are sometimes necessary.

Sometimes, down here, we rate jobs by the beers you drink before finishing.
You've probably got a six beer job to do there.

Hope it goes well,
Mack1

Raylo · 06-25-2008, 07:35 AM

Got to working on this over the weekend. I was able to somehow get a tap in there (1/4" driver with swivel adapter) to chase the threads and the bolt goes in easily and holds torque. :-) I also was able to clean the old EGR and re-installed it with a gasket that has a screen over the port. Maybe that will keep it cleaner for longer. Mission accomplished.

While in there I also replaced my a/c compressor (old one was very noisy) and condenser and fabbed up and installed a set of Camaro dual electric radiator fans (got rid of belt drive fan). I guess I got a little carried away. ;-) Driving smooth and cool again.

BUDFAN8 · 06-25-2008, 09:59 AM

good to hear.

**mack1** · 06-25-2008, 10:55 AM

Great job Raylo and glad you didn't have to worry with the heilcoil.

05-30-2008, 02:02 PM	#1 (permalink)
Raylo Registered User Join Date: Feb 2006 Location: Maryland, USA Posts: 293 OS: XP Desktop, Vista HP Notebook, XP Notebook	[SOLVED] S10 EGR... again! Well, it's acting up (sticking open) again. This for a code W CPI 4.3 Vortec V-6. According to Haynes there were several types of EGR and the one for my code W is not what I am used to seeing. It's unusual, and unusually expensive. Thanks to a tip in the excellent step-by-step procedure below I was able to confirm my diagnosis. I took a ratchet extension and banged on the EGR housing. The idle immediately settled down into its smooth old self. Anyway, anyone with this motor might want to peruse the link below. Good info.... but I don't think the pictures will come up unless you register for the site. I was already a member. I'm going to live with mine for awhile and see how it goes before springing for a new one. http://www.s10forum.com/forum/f201/e...-how-to-18667/ Last edited by Raylo : 05-30-2008 at 02:04 PM.

05-30-2008, 04:18 PM	#4 (permalink)
mack1 TSF Articles Team Join Date: Nov 2007 Location: Texarkana, Texas Posts: 768 OS: xp sp2 My System	Re: S10 EGR... again! Hi Raylo, You're probably right about the codes just showing up in OBD II. The engine will likely run just as well. The whole idea about reburning exhaust gas deals with emissions as I understand it. Not a thing that was done on the older cars that I grew up with. Best regards, Mack1 __________________ "If you like yourself others will like you also" me "Don't drink downstream from the herd" Will Rogers Submit New Articles Here

05-30-2008, 04:25 PM	#5 (permalink)
Raylo Registered User Join Date: Feb 2006 Location: Maryland, USA Posts: 293 OS: XP Desktop, Vista HP Notebook, XP Notebook	Re: S10 EGR... again! Yes, it is emissions and has an effect on mixture and combustion temps. I suppose taking out the bit of exhaust might make it run a tad rich until the computer gets feedback from the O2 sensor and learns and adjusts the injectors to compensate. It'll probably cause one of the pollutants to go up a bit but not enough to matter. Heck, after I banged on it it might be OK for another year or 2 anyway. ;-/

06-16-2008, 05:46 AM	#6 (permalink)
Raylo Registered User Join Date: Feb 2006 Location: Maryland, USA Posts: 293 OS: XP Desktop, Vista HP Notebook, XP Notebook	Re: S10 EGR... again! Got to working on this problem this AM. It's worse than I expected. I looked at the EGR valve and one of the 2 mounting bolts was cross threaded into the aluminum intake manifold and only inserted half way. So the EGR was only tight on one side. Even if it wasn't sticking there was probably a vacuum leak there. Pep Boys (in FL) work.... gotta love it. I need to pull the a/c compressor out of the way to get access to run a tap through the hole. It looks like the rear half is undamaged so I may not have to helicoil. And they ask why I do most of my own work on my cars??

06-25-2008, 07:35 AM	#8 (permalink)
Raylo Registered User Join Date: Feb 2006 Location: Maryland, USA Posts: 293 OS: XP Desktop, Vista HP Notebook, XP Notebook	Re: S10 EGR... again! Got to working on this over the weekend. I was able to somehow get a tap in there (1/4" driver with swivel adapter) to chase the threads and the bolt goes in easily and holds torque. :-) I also was able to clean the old EGR and re-installed it with a gasket that has a screen over the port. Maybe that will keep it cleaner for longer. Mission accomplished. While in there I also replaced my a/c compressor (old one was very noisy) and condenser and fabbed up and installed a set of Camaro dual electric radiator fans (got rid of belt drive fan). I guess I got a little carried away. ;-) Driving smooth and cool again.

06-25-2008, 09:59 AM	#9 (permalink)
BUDFAN8 Registered User Join Date: Apr 2007 Posts: 193 OS: XP	Re: [SOLVED] S10 EGR... again! good to hear.

06-25-2008, 10:55 AM	#10 (permalink)
mack1 TSF Articles Team Join Date: Nov 2007 Location: Texarkana, Texas Posts: 768 OS: xp sp2 My System	Re: [SOLVED] S10 EGR... again! Great job Raylo and glad you didn't have to worry with the heilcoil. __________________ "If you like yourself others will like you also" me "Don't drink downstream from the herd" Will Rogers Submit New Articles Here