Santa Fe 2001 and High RPMs in Park and When Starting - Hyundai Forums : Hyundai Forum
 
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#1 Old 09-16-2012, 06:24 PM
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Santa Fe 2001 and High RPMs in Park and When Starting

Hoping someone here can help me out with this. Earlier this week, noticed that my car was surging on its own; basically, if I came to a stop, I could still feel the engine, like it wanted to just take off. And if I would have taken my foot off the pedal, it would have done just that. Also, I knew the car had gas, but sometimes, when starting the car it would not start at all. I would have to wait about 5 minutes or so and add major gas to it with the pedal and then finally it would engage. And then the last thing was that when I would get to my destination and put it in Park, the RPMs would go up to about 1500 or so, maybe a bit higher and then stay there and go back down to about 1000, without me pressing on the gas pedal at all. So anyway, thought it was the throttle position sensor, so I had my Dad install a new one on the car. It was a pretty easy process and thought that took care of the problem. The surging part basically stopped, so the new TPS took care of that, but then it still had problems with starting. Took it to a car repair place the next day and they changed out the spark plugs, said that they were causing a misfire in the engine. Also changed ignition wires and a new gasket. So after they were done, drove away and all seemed to be fine, but then went to the dentist and Parked and then the RPMs went up again. Tried to start it immediately afterwards and it wouldn't start again. Tried a few minutes later, added gas with the pedal and it did start. Took it back to the car repair place, they drove it around, inspected everything and everything checked out fine. (Yeah, of course!) Ok, so just thought maybe the repairs were taking a bit to take effect. But later in the day, wouldn't start again. So next morning, took it to the Hyundai dealer. They looked at everything for about 2 hrs, and said that there was a vacuum hose that was leaking, so they put on a new clamp but everything else checked out okay. Ok, so now it starts fine everytime, but today it did that high RPM thing again when I put it into Park. It doesn't do it everytime, but the RPM will just go up randomly then go back down and go back to normal. Can anyone please tell me why it keeps doing this? Should I clean the IAC with some type of carb cleaner to get out any carbon deposits? Or could it be a bad MAF sensor? Not sure what the symptoms are of that. Thanks for reading this far and everything else seems to be okay now except for the random high RPMs when in Park and sometimes at startup too. I"m just highly frustrated right now and want it to run smoothly.

ETA: It's a 2 WD, V6 engine.

Last edited by lisamb27; 09-16-2012 at 06:29 PM.
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#2 Old 09-16-2012, 06:49 PM
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My first thougt was the TPS, but you say its replaced by a new one.
The vacuum hose, probably for EGR, only does minor influence, maybe rough idling.
The MAF only has small influence, it fine tunes your mixture to environmental factors, like air temp, pressure and puts in more fuel if you push down the throttle. So unlikely to let it rev up the engine.
Other guess is a changing throttle. The TPS senses its position, but the throttle itself is governed by its motor. Maybe it gets some stray signal when you select park, so maybe a wiring problem. Or maybe a grounding problem, like a bad ground link, a link screw could be loosened in time. It sometimes can cause very unpredictable links or interconnections of systems.
All in all a difficult trace.
Good luck,
Paul
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#3 Old 09-16-2012, 07:42 PM
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Quote:
Originally Posted by paul03 View Post
My first thougt was the TPS, but you say its replaced by a new one.
The vacuum hose, probably for EGR, only does minor influence, maybe rough idling.
The MAF only has small influence, it fine tunes your mixture to environmental factors, like air temp, pressure and puts in more fuel if you push down the throttle. So unlikely to let it rev up the engine.
Other guess is a changing throttle. The TPS senses its position, but the throttle itself is governed by its motor. Maybe it gets some stray signal when you select park, so maybe a wiring problem. Or maybe a grounding problem, like a bad ground link, a link screw could be loosened in time. It sometimes can cause very unpredictable links or interconnections of systems.
All in all a difficult trace.
Good luck,
Paul
Do you think it has anything to do with the idle air control valve? Doesn't that help to regulate the engine while in idle? When my Dad replaced the TPS sensor the other day, the IAC was directly in front of that so I know where it is; should I remove the electrical connection from that and then see how the engine reacts? Yes, I agree, a difficult trace, especially since all the other issues seem to now be fixed.
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#4 Old 09-17-2012, 05:31 PM
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Could also be the IAC, so you could disconnect. However, it also could cause a direct stall. Have a try. If a Check Engine light comes up simply ignore. After some good checks at startups after you put the connection back on it will go away by itself.
But I'm having difficulty linking this all to the Park action.
But then, you mentioned startup problems, so you could also check your Cam position sensor or wiring to it, because that is used at startup for timing. With running engine the Cranckshaft sensor does major timing.
You could do a search item on the forum for "hunting engine" problems.
Good luck,
Paul
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