1998 Hyundai Elantra Logo

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earhl z soberano Posted on Jan 20, 2015
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Unstable rpm of hyundai elantra 1998 model

Rpm is not stable at idle spped

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Bogdan Odwazny

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  • Hyundai Master 6,171 Answers
  • Posted on Jan 21, 2015
Bogdan Odwazny
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Joined: Jan 20, 2013
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CHECK IAC SENSOR,CLEAN THROTTLE BODY.

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2005 hyundai elantra gt normal idle rpm

in neutral your idle should be anywhere between 700-900, in gear it should be down around 500.
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I have hyundai elantra there is an idle speed varies and no stable of engine rpm then engine check apears in the dash board,no response when accelaration is depressed

Its sounding like a throttle pedal position sensor but i could be totally wrong here ,when the light comes on what is the code number its showing as this might give some sort of clue here ,Could quite possibly be a multitude of more than one fault as well ,best advice i can give here is to ask a local mechanic to have a look and see what they say as this sort of fault i have come across before on other models where the fault lay in the computer and loss of memory in the same caused by a battery going flat where the car wasnt used for a period of time but i dont think i can give a nice simple answer here sorry but if i had my head under the bonnet then perhaps i would have a better idea .
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What is factory spec's for idle rpm

in [n] put the parking brake on 800 rpm.
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Unstable idle speed, excesive engine vibration, some of white smoke during warm up operation, noisy valves, recently i have chaged the fuel pump and all filters,when i stop vehicle and release the brakes...

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop & owner manuals, service bulletins, campaigns, illustrations and procedures, etc
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2002 Hyundai Elantra 100k miles - 2.0l - running rough

sounds like the throtle position sensor is miss alined or the idle screw is backed off
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2004 hyundai elantra that surges violently 1000 rpm to 4000 rpm

could be afew things. vacuum leak, one dud HT lead, could be the water temperature sensor, O2 sensor, best to get it checked and get it read for fault codes
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Need info on timing belt 1998 hyundai elantra

The timing belt is normally replaced at 100,000 km (approx. 60,000 mi), but must be checked for wear and tear starting 75,000 km(approx. 45,000 mi) along with a major tune-up.

The switch near the shifter is the ECT (transmission control) which selects NORMal driving mode, and PoWeR mode. It is the battle between economy (NORM) and driving performance (PWR). As tested, the PWR mode delays your A/T upshift to a higher RPM. This utilizes your engine's higher revs, but really cuts into fuel economy.

Hope this helps.
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Just bought 1998 hyundai elantra with 96K miles on it. engine light came on and when i stop at red light, the rpm goes down and car starts vibrating. it gets better when i put it to park. anyone can help...

Sounds like the ISC (Idle Speed Control) which is adjustable.  The secondary idle needs adjustment to prevent the car from wanting to stall at low speeds.
Greg
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Idle peed to fast

if it is cold where you reside your car will run at a higher rpm then when in warm temperatures so that it can build up engine heat faster. if this is not the case you will have to take it in to the dealer ship to have it put on the computer
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