This afternoon I took off the EGR. It only had a bit of carbon build up - just a thin coating. The diaphram moved up and down freely by pressing it and air came out the little hole at the outlet spigot. I don't have a vacuum pump so I couldn't do an official test.
The throttle position sensor (TPS) test: With a voltmeter I checked terminals A and B. It was 5.03 volts with the key ON, engine off. However, terminals C&B only read 0.01 Volts. The Chilton manual states it should be 0.5-1.2 Volts. Also nothing happened to the voltage when I moved the throttle open and closed. Does this indicate a faulty sensor?
Idle Air Control Valve (IAC) test: Using an ohmmeter, terminals A&B and C&D both read on average 49 ohms which falls within the manuals parameters of 20-80ohms. However, when I went to remove the IAC, it unscrewed so easily that it was only about finger tight- maybe even less. The recommended torque is 13 ft lbs. For lack of a 1 1/4 socket to fit my torque wrench I don't know if this was correct but seemed not quite right to me. Everything looked ok with it so I put it back on. A little tighter this time. Could this looseness be a part of my problem?
Lastly, I found that a mouse had chewed the end of the vacuum hose going from the EGR solenoid to the EGR. The boot end separated from the hose so I reinserted it a little deeper and taped it with electrical tape. I live out in the boonies so I don't have immediate access to parts. Will replace it later.
I purchased the vehicle only last year and I have not had it tuned up. Not sure when the previous owner had it tuned up last either.
Hope these small things I did will help.. Any feedback would be appreciated.
Monday, February 22nd, 2010 AT 7:13 PM