200SX EGR Problem, replaced valve, sensor, and hose

hokietoner · Aug 28th, 2007, 09:14 AM

I've had my engine light on a while and since I moved to Massachusetts, and I can't pass inspection until it's resolved. The code is EGR related. I've had my EGR temperature sensor replaced, and that didn't fix it. My uncle (a mechanic) suggested replacing the EGR valve since it's a 1997 w/ 120K miles and it will go eventually anyway (I plan to have the car long-term). So I did that and while replacing it I discovered a busted small rubber hose connecting to one of the metal pipes leading into the valve (not the vacuum hose). So I replaced that too and figured that must be the problem. The light came back on AGAIN! So I'm not sure what else to do with this thing. I don't want to let the mechanic try to diagnose it and charge me up the nose, especially since I replaced the valve myself and it wasn't that hard. I also wonder about this mechanic since they never discovered the hose; I would think those are the first things they would check. I also tried to clean out the area as much as possible before putting on the valve, but there wasn't that much buildup.

I noticed this is mostly a performance forum; if there's a better place to post technical support questions let me know.

Any help would be great.

Ryan

**rogoman** · Aug 29th, 2007, 08:51 PM

Two other components that you might want to check:
- BPT valve
- EGR valve control solenoid

hokietoner · Aug 29th, 2007, 09:14 PM

Thanks for the suggestion. I've read a lot about EGR systems and of course they have varied over the years and vary by model. I'm not quite sure what my model has. I know that the control hose entering the top of the valve is the vacuum. There are two other ports (large and small) in the front. I believe the large port is from the exhaust manifold. The other one I'm not sure about. It's a small metal pipe that attaches via a rubber hose to the nipple on another device. It would help a lot if I could just figure out a diagram of this system. I know the control hose must go to the solenoid (eventually), which to my knowledge turns on and off the vacuum in rapid succession to control the valve and thus control the amount of exhaust recirculating. What does the other hose go to?