Question about 2000 Toyota Celica
2000 Celica GT-S. Throttle response and power is good. But when driving constant speed, often in lower gears, often starts 'bucking', engine speed rises and falls 100-300 rpm in a second or so, does this continuously until I change something, like stepping on the gas, changing gears or putting it into neutral. Also, when driving hard, after shift from 2nd at redline to 3rd (this is not exactly the smoothest shift), engine will 'buck' for 3-5 times as I keep my foot on the floor, before it settles out to its normal good acceleration. Sometimes, when engine is idling in neutral, it will unexpectedly stall. Starts again immediately but it is very annoying. Sometimes driving over bumps or road irregularities will seem to cause the problem, but not always. There is no check engine light or codes showing. Car is driveable, but only barely. Over about a month time, it has been getting progressively worse.
I suspected maybe something with the fuel delivery system or pressure regulator. One mechanic thought it is a worn timing chain, but he's not sure. I really have no idea what it might be.
Locate the mass air flow sensor. it's located inline with the air intake. it should be right after the air filter. disconnect the plug and see if the car runs better. also, when tapping on it lightly on the sensor with a screwdiver handle and the engine skips, could also indicate a bad sensor. these sensors will not always set the check engine light. suspecting the fuel system is also a possibility
Posted on May 27, 2010
Testimonial: "You were right on the money. The problem was the mass airflow sensor. Its amazing how one bad sensor can make an otherwise great engine run like a pig. The sensor has been replaced and a broken wire to the sensor fixed, now it runs flawlessly. "
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Posted on Jan 02, 2017
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Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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