I finally got a chance to work on the car Sunday. Here’s what I did.
I got a 3M fuel system cleaner kit, and cleaned the throttle body, it was very dirty, and ran the TPS tests that hmac300 suggested. The TPS appeared to be OK. The TPS circuit got 5v reference across the power to ground and.4v at the blue to ground. Had a friend operate the throttle, and the VOM showed a smooth voltage up to just under 5v. So because I couldn’t seem to find a problem, I replaced the TPS with a new one I replaced it before when I first got the car, and the part had a lifetime warranty. I then did the tests again to make sure that everything was OK. I found a rotted vacuum line, replaced it, and checked all the other lines. There was a hole in the fresh air hose where the PCV comes in to it, and I patched it with RTV until I can find a junk yard part to replace it. I sprayed carb cleaner on the throttle body, and around the manifold, and didn’t get any idle changes. Then I reset the code (22). Maybe the problem was a loose wire, and, it tightened up when I pushed the pins into the connector to test it (?). Should I replace the plug if the problem comes back?
I test drove the car and the light came back on. This time it was a 32 “EGR diagnostic switch incorrect EGR valve operation.” I reset the code, and didn’t drive again until today. The light came back on. I’ll check it tonight to see what it was. But the car seems to be running smoother and idling better.
Tuesday, October 9th, 2012 AT 1:13 PM