OK, wife's '95 SE 2.5 ATX idle had been getting progressively worse. Car would die at stop signs and when switching from rev to drive etc, and was difficult to restart. It seemed to start much better cold than when it was hot. Car has 130k miles.
First I swapped the IAC with another car. No change, but I can't guarantee the new IAC is good. Next I tried blocking off the EGR, idle still surged. Changed plugs, same problem.
I then noticed that the car is running extremely rich. There would be a black spot in the snow/ice under the tailpipe when warming up. It got to point where the car wouldn't start at all, so I towed it to a buddies, pulled out the plugs, cleaned them with a propane torch and eventually got it started and back home. I ran KOER and KOEO tests. Now the plugs are fouled again and I can't even get it started by cleaning the plugs.
Results of the KOER and KOEO tests (1995 EEC-IV - pre-OBDII):
KOER
116 ECT higher and lower than expected
129 Insuffecient MAP/MAF Change Dynamic Test
167 Insuffecient TP change dynamic test
173 Lack of HO2S switch, rich bank 1
225 No knock sensed during dynamic test
332 insuffecient EGR flow detected
653 TCS did not change states
KOEO Keep Alive
176 Lack of HO2S switch, lean bank 2
332 Insuffecient EGR Flow Detected
543 Fuel pump circuit open-battery to PCM
556 Fuel pump relay primary ckt failure
KOEO On Demand
111 System Pass
I checked the O2 sensors on streaming data and both were 0.8V - 1.0V when engine was warm. I may have not ran to WOT fast enough on the KOER test and this may have resulted in the three dynamic KOER test codes.
Any ideas of what's going on here?
First I swapped the IAC with another car. No change, but I can't guarantee the new IAC is good. Next I tried blocking off the EGR, idle still surged. Changed plugs, same problem.
I then noticed that the car is running extremely rich. There would be a black spot in the snow/ice under the tailpipe when warming up. It got to point where the car wouldn't start at all, so I towed it to a buddies, pulled out the plugs, cleaned them with a propane torch and eventually got it started and back home. I ran KOER and KOEO tests. Now the plugs are fouled again and I can't even get it started by cleaning the plugs.
Results of the KOER and KOEO tests (1995 EEC-IV - pre-OBDII):
KOER
116 ECT higher and lower than expected
129 Insuffecient MAP/MAF Change Dynamic Test
167 Insuffecient TP change dynamic test
173 Lack of HO2S switch, rich bank 1
225 No knock sensed during dynamic test
332 insuffecient EGR flow detected
653 TCS did not change states
KOEO Keep Alive
176 Lack of HO2S switch, lean bank 2
332 Insuffecient EGR Flow Detected
543 Fuel pump circuit open-battery to PCM
556 Fuel pump relay primary ckt failure
KOEO On Demand
111 System Pass
I checked the O2 sensors on streaming data and both were 0.8V - 1.0V when engine was warm. I may have not ran to WOT fast enough on the KOER test and this may have resulted in the three dynamic KOER test codes.
Any ideas of what's going on here?