Question about Hyundai Tucson

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My tuscon revs it's RPMs while I'm driving and the drops back down. It's happening pretty often. But check engine light doesn't come on

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Clean the throttle interior and throttle plate edge. It is likely that oil deposits are lining the throttle opening and this causing the plate to stick so that when you press of the accelerator the throttle plate stays closed and then pops fully open leading to the is surge and slow effect.

Posted on Mar 22, 2011

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Posted on Jan 02, 2017

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Does the driving on overdrive mode cause high fuel consumption, because the transmission use the first three ratios mostly?


driving in over drive mode actually is what gives the economy as the engine rpms will be around 300 less than direct drive . Lower rpms = fuel savings
OD should come in around 60 klm/hr and drop out at around 50 klm/hr. When you are accelerating hold the pedal in a set position and watch the rev counter (rpms ) and each gear change you will see the rpms drop and then build back up as the vehicle speed increases At 100klm/hr the revs should be around 3200 rpms or less but if over ( say 3500 rpms) then may be the OD is not coming in. One way to test a box operation is to find a speed shop with a dynomometer and test the gear selections against loads and engine rpms

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My 96 ford taurus revs high when starting then works it way from 1500 or more down to 800 but fluctuates from 800 to a little over 1000. When putting car in rverse or drive from park engine revs up to...


You need to clean the IAC again and also the throttle valve and bore, use only CRC brand Throttle body cleaner. After they are thoroughly cleaned disconnect the battery for 5 min's and then drive the car in varying condition for a few days. If that doesn't cure the issue you have more serious problems and will need a scan tool to look into the readings from the MAF, TPS and ECT sensors. High idle cold start is normal then slowly dropping after a few minutes. I assume you never had a check engine light. Correct?

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High revs


being a fuel injected engine , there are many reasons this could be happening.
from the top , lets check the Manifold Absolute Pressure (M.A.P.) sensor , as it is easiest.
Find the MAP sensor , it has a couple a wires and a vacuum tube going to it and is on the firewall or fender support under the bonnet.
Disconnect the wire harness from it (small plug with wires).
If the engines RPMs drop to normal , replace the MAP sensor.

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