Hi, we just bought an 89 V6 camry,(144,000 mi) the engine pulsed, idled rough, and tended to die. we did a bearyman's flush through the intake and a radiator flush, since the coolant had stop leak in it (radiator was just replaced). Then pulsing has become less frequent and we now notice it only when idling for awhile or with high rpm's. The heater core is plugged, since the flush we do get a little heat. The vacuum hoses have been checked and a tune up was done. The body and interior are in immaculate condition and the only other problems we've found with it have been a slow power steering leak and rotted exhaust after the O2 sensor, so it shouldn't affect the engine. Have you heard of this before? What could be the cause or causes? Stumped in Minnesota
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Some "check engine" light in your dashboard? If YES, need to scanned the PCM (computer) to know exactly what fault code is stored there. If NO, the crankshaft position sensor may fail, causing engine stalling or a
failure to start. Replacement or the failed sensor will commonly correct
Also, keep in mind that on the 2.7L V6 and 2.4L 4 cylinder, a defective Exhaust Gas
Recirculation (EGR) switching valve may cause an intermittent rough or
unstable idle engine.
Stalling synthoms... you can have a plugged exhaust, plugged fuel filter, bad airflow meter,
problem with the ignition system, incorrect timing belt/chain setting,
and failing fuel pump....I'm sure there's more but that should get you
Camshaft Position Sensor-On top of engine
The Engine Management System (EMS) uses the camshaft position sensor to manage sequential fuel injection and as part of misfire diagnosis. The EMS constantly monitors the number of pulses on the signal circuit. The EMS compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the EMS receives an incorrect number of pulses, Diagnostic Trouble Codes (DTCs) should be stored in the EMS. Some engine management systems will then default to multi-port or "gang-fire" injector operation. The camshaft position sensor signal is required to sequence the injector operation to the proper cylinder timing. If the camshaft position sensor or circuit is faulty, most engines will start. However, the EMS misfire diagnostic will likely be affected.
The following symptoms can be caused by an intermittent wiring connections or faulty signal to the EMS. Related Symptoms
Does the engine run properly when you drive it? Does it accelerate normally, or does it hesitate & ****? If it runs poor, it may be the wires crossed. If it just stalls at idle, you may have a bad Idle Air Control (IAC) valve, or a partially stuck open EGR valve.