Question about 2002 Hyundai XG350

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My 2002 Hyundai XG350 has rpm problem. RPM drops to around 500 and whole car starts to vibrate. I changed throttle body, spark plug and wires but doesn't solve anything. Can you help?

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If i can help you, i have the same problem and i discovered that my CATALYTIC CONVERTER was blocked and the two pre-cat too !
First i think it's was the throttle body but no ! After checking every electronics parts,a friend of mine takeout the first oxygen sensor on the line of the exaust and i see a difference
We clean (take out) the interior of all catalytic on the exaust line and replace all parts after, the oxygen sensor too !
i try it on the road for a week,and that's it,we have resolved the problem. Wow ! at last
I bought the new pre-cat and the catalytic converter and i got a new car.
It took two months before we found the probleme. I read on the web different solution but no one
have the good one.
Sorry for my english,i hope you understand what I have write(What I explained)

Posted on Oct 31, 2010

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Posted on Jan 02, 2017

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Ive got a Corolla 2006 model,im getting a lot of vibration from the engine while in drive but stationary-like at the red light,my engine RPM is showing about 500 is that to slow can I get the RPM adju


Hello, the idle speed is controlled by the computer, there is no adjustment, what you can do is to clean the inside of the throttle body:

Remove the intake hose from the T/Body, disconnect the battery, use a can of air intake/throttle body cleaner and a brush, open the throttle all the way and clean the carbon out, put the hose back and reconnect the battery, start the engine and keep the rpm up until it clears out, drive it for about 15 minutes, about 90% of the time this fixes low idle.

Feb 15, 2015 | 2006 Toyota Corolla

1 Answer

P2112


- Throttle Body Plate Binding or stuck/dirty
- Faulty Throttle Actuator or linkage
- Throttle Actuator harness is open or shorted
- Throttle Actuator circuit poor electrical connection

Dec 17, 2013 | 2002 Hyundai XG350

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fuel injectors may be clogged and not spraying properly

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clean throttle body,you can adj.set screw at throttle could be on top or bottom.

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PROBLEMS LOW IDLE TOYOTA COROLLA 2006 AFTER CHANGE BATTERY


if it has an oil control valve try replacing that good luck

Mar 10, 2017 | 2006 Toyota Corolla LE

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How can I adjust the rpm's on a 2004 Hyundai XG350L


You can not adjust rpm's, it is controlled by the engine computer. if you idle is not right, either your throttle position sensor is not right, or your idle air control is malfunctioning, although there can be numerous other causes for erratic idle (vacuum leaks, throttle body or air filter needs servicing, etc.).

May 23, 2011 | 2004 Hyundai XG350

3 Answers

Hi I drive a 2006 corrolla with 70,000 miles. I noticed the idle slowly but surely gettin a litttle rough and lower. This only starts to happen after I have been driving for about 5 min. It usually happens...


It's been almost 2 years since you posted the question so it's likely you will not see my answer to your question.

First, do NOT make any adjustments to your throttle body idle setting. The screw most likely never budged since 2006 so you should not touch it since this is not the root cause. But yes it is wise to check all vacuum lines as "craig" suggested.

I have a 2007 Corolla CE, 1.8 liter VVT engine, 5 speed manual transmission which I bought new from the dealer. Currently has about 108k miles on it. After about 4 or 5 years in cool to cold weather it started doing the same thing. I researched it online then asked my local Advance Auto Parts person who confirmed my hunch. It is known as "idle hunting" when the engine is cold, in colder outside temperatures the idle rpm's will increase up to roughly 2000 rpm then drop to idle, then back to 2000 rpm, then repeats multiple times. Then after driving a short distance, stopping and running at idle, the idle speed may drop to 600 or 500 or as low as 400 rpm, running quite roughly but still keeps running. My Corolla normally idles smoothly and steadily at 800 rpm when warm or hot. The idle hunting or low idle rpm will typically correct itself when the engine warms up enough.

The problem: the intake manifold gasket has aged and shrunk a bit, allowing engine compartment air to get pulled directly past the gasket and into the cylinder head intake port. This causes an imbalance between the reduced air filter airflow sensed by the Mass AirFlow (MAF) sensor versus the actual air/fuel ratio versus the engine rpm versus the oxygen level in the exhaust stream. The gasket will shrink more as the temperature under the hood drops, allowing more air to flow past the gasket. The Engine Control Unit (ECU) is simply trying to do its job as programmed by increasing fuel delivery to compensate for the overall imbalance, then when rpm's get too high it will reduce fuel delivery.

The solution: purchase a new intake manifold gasket for roughly $10 to replace the stock gasket. Mine is a thin orange polymer gasket with round cross-section which seals around all 4 intake ports. You can search for instructional video of how to install it on YouTube.

I purchased one but did not install it yet. I am sure this will resolve the problem since all other suggested fixes I found on the internet did nothing but unnecessarily frustrate the owners.

Apr 03, 2011 | Toyota Corolla Cars & Trucks

2 Answers

Engine vibrates when idiling in drive only does not vibrate in park or neutral or reverse has new motor supports (all) recent tuneup cant determine cause (the motor runs so smooth except while idiling then...


Check your throttle body gasket, if it's leaking unmetered air it will idle high, this coupled with a bad ignition coil, plugs not properly gapped or old/worn as well as old/worn spark plug wires will cause a misfire that may not trip the CEL light. Also check your idle air control valve to ensure it's working and clean on the inside of the throttle body.

Nov 28, 2010 | 2002 Kia Spectra

1 Answer

Rough idle after new plugs and fluctuating RPM's


Check that you have installed correct type of spark plugs and wires are well fitted. SPARK PLUG 3.5 V6 Type Champion RC10PYP4 Plug gap 1.0-1.1 mm (0.039-0.043 in.)

Jun 02, 2008 | 2002 Hyundai XG350

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