Engine revving too high

ROBBUE

MEMBER
2000 HYUNDAI ELANTRA
1.5L
4 CYL
2WD
AUTOMATIC
134,090 MILES

GLS model. Sometimes after driving at 60 kphs around the town, revs really high all of a sudden and then becomes sluggish to drive for a while. The transmission has been serviced, and I don't use transmission oil at all. I am wondering if it could be the fuel pump, the transmission solenoid or running the car too low with the fuel. It only does this every now and again, and I don't do many open road drives. Could this be the problem? I look forward to your reply. Cheers. I also have a bottle of Lucas Transmission Fix and do I need to let some fluid out to add that or just add it? Robyn

Sunday, February 3rd, 2019 AT 6:20 PM

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
51,853 POSTS

Hello,

It would be best if you can please shoot a quick video with your phone so we can hear the noise and see what the car is going, that would be great. You can upload it here with your response. It sounds like the idle speed controller is going out or the car is going into limp mode, we should run the codes. here are two guides to help us get started with diagrams below:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/reduced-power-limp-mode

Check out the diagrams (below). Please let us know what happens.

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Tuesday, February 5th, 2019 AT 11:34 AM

SEVAG P

MECHANIC
405 POSTS

Hello thanks for using 2CarPros.

Here is our guide:
https://www.2carpros.com/articles/engine-idles-too-high

it sound like engine idle control is not working properly. because if the problem was vacuum leak engine rpm is always be high. check fault codes first.

The idle speed control actuator is the double coil type and has two coils. The two coils are driven by separate driver stages in the ECM. Depending on the pulse duty factor, the equilibrium of the magnetic forces of the two coils will result in different angles of the motor. In parallel to the throttle valve, a bypass hose line is arrange, where the idle speed actuator is inserted in.(check its location at picture 1)(circuit diagram picture 2).
check harness inspection procedure(picture 3).
actuator inspection.(picture 4)
1. Disconnect the connector at the idle speed control actuator.
2. Measure the resistance between terminals.

Standard value
Terminal 1 and 2 16.6-18.6 Ohms
Terminal 2 and 3 14.5-16.5 Ohms [at 20 °C (68 °F))

3. Connect the connector at the idle speed control actuator.
Troubleshooting Procedures(picture 5)
Trouble shooting hints
Open or short circuit is observed in idle air control system when ignition switch is turned on.(picture 6).
please run down these troubleshooting and report back.

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