Re: Revs ''hunt'' on tickover, sometimes revs drop so low...
Thanks to some advice I have fixed the problem with my Granada. The pipe work from the exhaust manifold to the inlet manifold has a short piece of plastic pipe which needed replacing. This seems to have done the trick.
I would like to thank you for running this site. Without it I would still be re-starting my car each time I stop at a red light!
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The place to start is probably the transmission. One of the telltales of a transmission failure in the making is a problem with your engine's revs. It the revs seem to go up but your Hyundai doesn't seem to be going anywhere it is pointing to a problem with slipping clutch packs or bands. If it is dropping revs on the low end and hunting it may mean that the speed sensor is failing or that the torque converter is having a problem providing a constant pressure. Either way, the place to start is the transmission.
If engine is increasing/decreasing constantly this is called hunting. Or does it suddenly just rev wildly then go back to normal?Please give more detail and resubmit. Please andd make model year and engine option of vehicle
I had a similar issue while driving the car at about 70 - 90km/h. I also had horrendous vibrations. It ended up being the original trans fluid requiring changing to a more superior product than what they originally came out with. The car had done less than 50000km.
First ensure that the throttle interior is really clean, a surface layer of grime can upset the ECU's ability to meter and govern the air entering the engine. If the throttle body interior is found to be really oily and dirty check on the idle air control valve and make sure that it too is cleaned up. Next put the ignition switch in position 2 (on, but no start) and depress the accelerator fully and release. If there is an issue with the throttle position sensor this procedure can help the ECU relocate the throttle plate position. Start the engine and if it is still hunting locate the air mass meter (AMM) on the air ducting immediately next to the air filter and disconnect the electrical connection. Does this remove the hunting aspect?... the rev speed might change but for the moment concentrate on the evenness of the tick-over. If the idle is even when the AMM is disconnected but hunts when connected then look at replacing your AMM. Try spraying the AMM with no residue electrical cleaning spray to see if this improves matters.
This is most probaly a sticky trottle control whitch need to be replaced and then updated with new software. Dealers are aware of this trouble, but most offen denies the fact if you ask. Costs--- 200euro, three years ago! Volvo owner in Sweden