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1991 Ford Tempo car runs rough after warming up

Tiny
CZICN34
  • MEMBER
  • 1991 FORD TEMPO
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 138,000 MILES
Recently towed a small trailer, started to run real rough, missing and sputtering, could romp on the throttle and it would run but then at idle again would spit and sputter again. Replaced O2 sensor, plugs, wires, cap rotor. Found a small pin hole in the heater bi-pass hose, fixed that and discovered the anti freeze was spraying on the two sensors in the thermostat houseing. So dug into that and replaced thermostat and the bi-pass hose. Car will start and run like a dream. Almost down to the tick, as soon as the car hits operating temp, it will miss and start to spit and sputter and like it won't even get out of its own way.
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Tuesday, March 23rd, 2010 AT 10:09 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:inspect and test all the following below:
1. Defective spark plug.
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Tuesday, March 23rd, 2010 AT 11:37 PM

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