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Had something come up, so wasn’t able to get to this as quickly as I would like. Here’s an update.
I removed the vacuum line going directly to the EGR. The idle immediately improved. Then I hooked a vacuum pump up to the EGR. When I put a vacuum on it the rough idle returned. The vacuum pressure did not stay steady, but quickly decreased. I checked the connections between the hose and pump and hose and nipple on EGR and I don’t think that’s where the vaccuum pressure was escaping. I interpreted this as a bad diaphragm in the EGR Valve. Then I hooked the vacuum line back up and headed to auto part store to pick up a new EGR valve. TO my surprise, the car was running remarkably better on the way to the Napa. Unfortunatley, we got hit with a crazy storm while I was in the sotre, and the power went out. I didn’t end up buying the part.So now, the car is running A LOT better. Also, the check engine light hasn’t returned, though it’s probably only been driven 30-50 miles. I’m wondering if somehow I inadvertently cleared a blockage somewhere when testing the EGR valve initially. Does this make sense? I’m still planning on spending the $50 for a new valve and replacing that in the next day or two. While I have the old valve removed, I’ll check where I can for built up carbon.
Does it sound to you guys like this is good to go when I replace the EGR valve? Is my diagnosis of a bad diaphragm inside correct? Thanks a gain for all your helP!
Thanks guys! Eric–those videos are great, thanks a lot for making those. I’m still confused as to if it was a catalytic converter why it didn’t kick the p0420 code instead. Either way, I’ll certainly check for exhaust restrictions in addition to checking the EGR.
Thanks again!I read that clogged catalytic converter (or three 🙁 ) can cause the problem. It makes sense to me–if the engine can’t “exhale” it’s not going to fly. I’ve read that the DPFE sensor is the culprit most frequently. I guess what I’m wondering (being a complete dummy on this stuff) is could a faulty DPFE cause such a severe loss of power?
THanks again for your inputThat’s what I don’t want to hear :). If it was a plugged cat conv, wouldnt I have received a P0420 code, though? Is it possible its something in the EGR? Or is that unlikely to cause such a drastic change? Would you recommend doing the check of the valve, sensor, and solenoid like i outlined before checking the cat?
Thanks!