Hello again everyone. If you've been keeping track of my issued, I've run the car about 500 miles without any real problems. It continued to throw codes, only at idle, and still oscillates at idle.
Since I chiseled out the cracked remnants of the pre-cat in my exhaust manifold, I'm guessing the diameter of the pipe has significantly reduced the pressure at the EGR connection. At idle, I think the EGR is actually flowing the opposite direction it is suppose to with the negative pressure being in the exhaust at low RPM. All my codes are idle/fuel/air related, but it doesn't always throw the same codes except for "absolut mani pressure".
To try something else I just disconnected the EGR up front, moved it out of line, and let it run. No codes over about 5 minutes. Obviously pretty loud, and idle seemed a touch high at 900rpm (where it had been about 5-600rpm with EGR hooked up); but it was smooth. Is there anything easy I can do to seal off the EGR temporarily and figure out if it will run well like that over a couple days? If it really solved all the problems; I will probably get a header to throw on there, assuming that will solve the pressure problem. I just don't want to drop a couple hundred and find out this had nothing to do with the problems.
Since I chiseled out the cracked remnants of the pre-cat in my exhaust manifold, I'm guessing the diameter of the pipe has significantly reduced the pressure at the EGR connection. At idle, I think the EGR is actually flowing the opposite direction it is suppose to with the negative pressure being in the exhaust at low RPM. All my codes are idle/fuel/air related, but it doesn't always throw the same codes except for "absolut mani pressure".
To try something else I just disconnected the EGR up front, moved it out of line, and let it run. No codes over about 5 minutes. Obviously pretty loud, and idle seemed a touch high at 900rpm (where it had been about 5-600rpm with EGR hooked up); but it was smooth. Is there anything easy I can do to seal off the EGR temporarily and figure out if it will run well like that over a couple days? If it really solved all the problems; I will probably get a header to throw on there, assuming that will solve the pressure problem. I just don't want to drop a couple hundred and find out this had nothing to do with the problems.