Hi, i have elantra1.6gl 2001(new shape) fuel injection.
Would like to know, when driving press the clutch down and release accelarator, the engine take long to drop rpm.
also when standing still, accelarate and release engine rpm come down slowly.
What could be cause of this problem?
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When a car is in gear with the Gas pedal pushed down, the engine RPM is high so the oil pressure is high too that means the Sending unit is detecting high pressure. But when you engage the clutch that means the gas pedal is released so the RPM drops and the pressure drops down too. So all i can say is that you might have a bad oil pump that needs always high RPM to keep the oil pressure normal.
There could be two problems i can think of here. First would be a computer problem. The computer might be telling the car to run at a high speed. A problem like this might be fixable from your local garage. A problem like this could be expensive. Second, as engines age, they natually tend to idle higher. This is a normal occurance. This is accompanied by a decrease of gas mileage. For me, i went from normal 26mpg down to around 22mpg. A problem like this can be fixed by using fuel additives aimed at high mileage cars. I have used fuel injector cleaners, and that has brought my car back to her glorydays of 1996. I hope this helps, if not let me know.
i'am no expert on this car, but i would chk. the T.P.S. (throutle positioning sensor) there also may be carbon build up on throutle butterfly, not letting it close completely when you take your foot off the pedel.
Check your mass airflow meter. If it's bad, at least on my 1990 300ZX, the car won't rev over 2400RPM (it's a safeguard built into the ECU of the car). Grab one from a scrapyard and swap it in and see if that fixes the issue.