1997 Chevy Cavalier 4 cyl Front Wheel Drive Automatic 139710 miles
I had the following issues to start. Blown head gasket, an inoperative cooling fan, erratic idle, oil pressure light on, low coolant light on, ETS light on, and codes for TPS (P0121 & P0122), O2 sensor #2 (P0141), cylinder 2 misfire (P0302).
I checked the alternator-Good. Replaced the head gasket, cleaned the inside of the intake manifold and replaced the intake manifold gasket, exhaust manifold gasket.
I replaced the Coolant temp sensor, cooling fan relay, new thermostat (180 degreee), added new coolant (about 60 % mix) reconnected the battery and cranked it over.
It Runs, still rough. But the cooling fan now kicks on at 208 degrees. Fan went thru several cycles on and off. Appeared to be working fine. Then the oil light came on and I shut the car off. Idle speed was bouncing between 560-620 RPMs by the Accutron CP9180 Scan tool I have. I found that the idle speed should be between 600 and 700 rpm, so I turned the idle speed adjusting screw in just enough to get it to stay about 600. Oil light is now off. Now the Fan doesn't work AGAIN! Temp hit 219 and I shut it down. I removed the fan relay, jumpered the fan power to fan motor connections under the relay and started it back up. Fan works, runs fast. I left it run like that for about 4 minutes to cool it off, then shut off the engine and continued to run the fan for another 2-3 minutes.
I rechecked the codes and found a P0300 random cylinder misfire, also the ETS light is back on and the low coolant light is still on (I have a new sensor for this. Forgot to swap it out).
What could cause the fan to suddenly quit working when it worked just 5 minutes prior?
Also. Something in this car was shorted to the point of needing to replace the ignition switch in the column according to the previous owner. I am begining to wonder about the PCM, would this be a reasonable worry?
I appreciate your help.
have the same problem?
Tuesday, April 20th, 2010 AT 12:12 AM