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Showing results for tags 'sudden stalls'.
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My 2.2l Legacy engine will slow down below a normal idle to about 500 RPM and then quit suddenly, usually while waiting at a stop sign or light. 240000 miles, o2 sensor maybe never changed. (I am not the first owner, just the latest) Fuel pump and strainer is new as is the fuel filter. Fuel pressure is about 35 PSI, 40 psi when vacuum hose is disconnected from the regulator. Problem is more acute when the weather is wet, either rain or dew. New plugs and wires. Engine will rev freely to redline and pulls like a tractor over 2000 rpm. Below that, it is subject to quick jerks that I interpret as momentary stalls and below about 1200 RPM it will stall out suddenly, usually at stops while in gear. I have an automatic transmission. The ECU reads out a 13 DTC which should be a faulty cam position sensor, but as mentioned before the engine is strong and does not seem to misbehave above 2000 RPM. Also the alternator recently died while enroute from work to home and the whole shebang died and left me in the dark on a back country road. When the engine finally died during that episode it could have caused the ECU to store a DTC 13. It never lit the check engine light. No complaints in the ECU about anything else including the O2 sensor or MAF sensor. Under load such as driving uphill the engine starts to shake at about 60 MPH and smooths out about 70 or if you back off the throtle. Had the wheel balance checked, it was okay. I plan to reset the DTC to see if the 13 code comes back before replacing the expensive CAM Position Sensor, but I am planning to replace the O2 sensor on general tuneup principles soon. I have noticed in other cars I own that an old O2 sensor can cause driveability problems, some that you might not suspect are related to that sensors function. Maybe clean the MAF also. Does anyone out there have experience with these kinds of symptoms? I would like to hear from you is so.