Question about Hyundai Motor 1998 Sonata

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Car revs high at start up and wont rev down

Its about 5 degrees outside but even the car warms up it wont come down from revving high at 5 or 6 rpm

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Ajkill
  • 2035 Answers

SOURCE: won't rev past 2000 rpm

Check the computer on the car it may be programmed to run still on 2 K rpm you need to reprogram the computer on your car.......

Posted on May 27, 2008

  • 101 Answers

SOURCE: when I start the engine from cold it runs on high revs too long

Hi ..... This sounds as if it's fitted with an automatic choke, as long as the revs drop when it's warm there is nothing to worry about. The indication when these start to go wrong is that the car won't start when cold ................ even then any decent mechanic can fit a normal/manual choke.

Posted on Jan 03, 2009

BritishChick
  • 2 Answers

SOURCE: High rev when starting hyundai atos

Check the vacuum hoses, but sounds like the IAC or even the o2 sensors. The computer will pick up on the o2 sensors but not the IAC..Go to your local ADVANCE store and they will check on computer for free :)

Posted on Jul 26, 2009

  • 1 Answer

SOURCE: engine high rev at stop and slowly goes to idle speed.

I've got Hyundai Lantra 1.6 year 2000. It's take time to start when it's hot. When I start my car it revs at about 2k-3k rpm. It also does it when I come to a stop. When I come to a stop it will stay at a higher rpm than that of idle speed. It drives ok when on freeway but uses more petrol. I have changed the water & petrol pump but no luck

Posted on Feb 12, 2010

  • 248 Answers

SOURCE: Are you stumped too?? Here is a log of a problem

check for dirty fuel filter at engine,,,also you can try one more additive...SEAFOAM...nine bucks a can...add to your gas tank, the trhottle body...follow direstion on the can....don't be alarmed that the engine might smoke...it is temporary and usually fixes fuel problems caused by dirt of carcon build ups....houpe you can use this info

Posted on Mar 12, 2010

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My car is over revving going to 1000 rpm at idle what is it please help Audi A3 s line 2.0 tdi


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1 Answer

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I'm guessing but this sounds like air problems. do you have a new air filter? The O2 sensor may be off but not technically bad yet. I'm pretty much stuck on something restricting the air flow.

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My grang cherokee2002 us spec, while driving trnz changes fine but when cick down or full excelrate and RPM reaches 4.5 or 5 engine is loosing power and getting noisy and RPM not going more, while gear on...


You are hitting the rev limiter top range, which cuts off your ignition.

I have a 2001 Grand Cherokee and the problem drives me crazy, but it is the way the car is designed- as soon as you hit the rev limit, it shuts down ignition and your jeep will "buck" - a real pain when you are trying to accelerate into traffic!

You have the 4.0L straight six engine, yes?

If so, please take my advice and learn to live with the minor annoyance of the rev limiter- that engine is IMHO the best Chrysler ever made (nearly "bulletproof"!) and it was so reliable you cannot even get it in a jeep now! For decades, that engine was used in welders, tractors, generators...and yes, jeeps... and it is a favorite among mechanics for its durability!

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1 Answer

When turn on the car in the morning, i accelerate and the revolutions up to 6,000rpm normal. In 3 minute when the car up the motor temperature to the normal operation, i accelerate and the revolutions up...


To begin with, if you are revving a cold engine to 6000 RPM, you are asking for a blown engine. Most OBD vehicles are equipped with a rev limiter that will cut off fuel at 3000 to 4000 rpm to prevent you from over-revving your engine and blowing it up. If yours is revving to 6000 RPM cold, then the rev limiter, for some reason is not working while it is cold. I have no explaination for this. The best thing I can tell you is to stop revving your engine so high when it is cold unless you really want to see what an engine looks like after is has gone off like a grenade.

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Timing has been adjusted to high, or the spark advance is out of adjustment causing the revving

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1 Answer

When I start the engine from cold it runs on high revs too long


Hi ..... This sounds as if it's fitted with an automatic choke, as long as the revs drop when it's warm there is nothing to worry about. The indication when these start to go wrong is that the car won't start when cold ................ even then any decent mechanic can fit a normal/manual choke.

Jan 03, 2009 | 2004 Hyundai Santa Fe

1 Answer

REVS TOO HIGH WHEN COLD...........


High RPM is by purpose. Reason is to get engine hot as quickly as possible to reduce emissions. There is nothing to worry about. I am sure if engine is warm/hot then you wont see high RPM even if you resart it.

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