Question about 1994 Toyota Camry
My 1994 Automatic Camry 4-cyl with 162K miles has developed a studder. While stopped at a traffic light I can feel a noticeable studder/shutter and see a slight drop in RPM. It is not rhythmic and feels like the engine is just barely stalling most of the stopped-idle time. When shifted into neutral the engine runs very smoothly. Same symptoms if in R, 1 and 2 but not in park or neutral. When pulling away from the stop the engine shutters some more but smooths out at 2nd gear.
Last summer I changed out the spark plugs and ignition wires and oil change. The described problem has developed since then but not, in my opinion due to that.
I thought it might be needing a transmission fluid change so I purchased a new gasket and filter/strainer. Drained the fluid and replaced said parts. Also, drained and refilled the differential fluid. I topped off the transmission fluid fill with a 1/2 quart of Slick 50 transmission reconditioner.
I must have assumed wrong because the symptoms still persist. What else should I be looking at?
Well it didn't hurt anything to put the new fluids in. Always good to keep up on those some of the time forgotten routine maintenance. The erratic idle could be caused by a number of things. A leaking intake manifold gasket is one but usually is a steady higher racing idle. Could be clogged injector/s, not sure if you have a throttle body which would house a single injector or a fuel rail which would house 4, one by each cylinder. The other possibilities are any of the sensors that feed the information needed to the brain/on board computer to control the air and fuel to the engine under all conditions for optimal performance, and the emission control system.
Trouble shooting comes with several options. Fortunately most vehicles since the start of the electronic fuel injection systems, that would be everything since the end of the carburetor, comes with some description of an on board diagnostic system for trouble shooting the sensors and such.You can purchase a diagnostic tool, and you will need to purchase a Haynes or Chiltons Manual for your year make and model which will tell you what all of the different codes mean. You can find these at any of the auto part chains such as Auto Zone, Discount Auto Parts, Pep Boys etc. Most of these stores will test your on board diagnostics with their tool free of charge. The Manual never hurts to have in your possession as it covers mostly everything from A to Z for mechanical and electrical repair and troubleshooting. Some vehicles have a way of giving you error msg's by a series of turning the ignition key on and off a certain number of times, and giving a code by a series of an in dash light blinking and pausing, this would also be covered in the manual for your make and model.
Hope this helps,
Posted on Nov 25, 2008
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