Question about 1993 Mercury Topaz
Poor fuel mileage generally, it could also serge, caused by a lean condition generated by the defective O2 sensor (unlikely),
You would usually get a check engine light and the fuel system would revert to a condition sometimes referred to as "limp home mode" which is a predetermined setting when a failure occurs.
Pull the codes and see which one it is, if it is equipped with more then one sensor.
Posted on Jan 14, 2013
Poor fuel mileage.
Posted on Jan 14, 2013
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Posted on Jan 02, 2017
SOURCE: 1992 mercury topaz
I had the same problem. It was the idle air control valve. It sits on top of the intake just downstream from the throttle. There's a valve rod inside that gets worn over time and starts to stick. If that's what is causing your problem, you need to replace the unit.
Posted on Feb 09, 2009
I just got done replacing the O2 sensors in my 99 Cougar due to throwing a P0135 malfunction code. There's 3. Facing the engine there's one in the front coming off of the front header, which is easy to get to. Another more tricky one if between the engine and the fire wall on the rear header pipe. The third is under the vehicle behind the transmission pan on top of the exhaust. In order to replace the O2 sensor near the fire wall you will need to remove the 4 retaining bolts for the ECM module and move it out of the way. Additionally you will need to remove the 2 retaining nuts for a wiring harness that is seated below the ECM module. Pay close attention to the connectors because the front and under vehicle O2 sensors have round connectors the one near the firewall has a squared connector. I was able to replace all 3 by myself in approximately 35 minutes. If your throwing a O2 heater malfunction code it is most likely going to be the sensor near the firewall. make sure that you know someone with a code reader so the code can be cleared. If you're do for an emmissions inspection be sure to put at least 40 miles on the new O2 sensor with different types of driving (e.g. highway, coasting, decellerated turns and rapid acceleration). Gotta love project cars for your kids!!
Posted on Apr 04, 2009
you don't need the manual just follow the exhaust manifold down pipe until you see a lug sticking off it with 1,2,3 or 4 wires coming out of the end, this is your o2 sensor then there could be another one behind the catalytic converter this is the second one and may not be there on your car. hope this has been of help. Regards John
Posted on May 15, 2009
the fuel pump relay is located on the left shock tower in the engine compartment in a black box 6x4x1 inches. there are other relays inside the same box which is actually called the ccrm or constant contorl relay module, there should be a double connector with 20 to 26 wires in it, hard to miss.
Posted on Jun 15, 2009
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