Question about 2000 Suzuki Esteem
Car idles normally, at 750 RPMs, but if it is moving faster than 4 MPH, the idle increases to 1700 to 2500 Rpms. This also happens if the car is rolling backward over 4MPH-----BOTH IN OR OUT OF GEAR. When driving normally the engine always idles at 1700 or more between gears and only returns to idle when the car slows to below 4 MPH, after a short pause, if the speed remains less than 4 MPH, or if sitting still. If the car is idling and you just push the car by hand in nuetral, the idle will increase to 1700 or more when the car is rolling 4 MPH either forward or backward. What is making this happen? It makes it harder to synchronize the gears and hurts fuel economy around town, as well. Please help.
Most Suzukis that are EFI do this. The vehicle speed is given to the ECM by pulses generated (in my case, a 1991, 1.3 GTi Swift) by the speedo unit. During gear changes, the throttle shuts and the engine would momentarily be starved of air and there would be a resultant increase in NOX emissions. The increase in air flow is from the ISC motor (idle speed compensator) and stops the mixture leaning out during gear changes. Don't mess with the TPS (throttle position sensor), and if you're changing gears at an RPM where the engine actually revs up, it's either cold, or you should be holding the gear a little bit longer. I'm in Australia.
Posted on Sep 17, 2009
Check the throttle position sensor. that should be whats wrong.
Posted on Jul 22, 2009
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Posted on Jan 02, 2017
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