Question about 2006 Hyundai Sonata

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My 2006 Sonata is idly roughly...the mechanic cleaned the throttle, belt is ok, and spark plugs are ok. What could be causing this?

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Sorry to read about you issue with rough idle.... The only advice I can offer is to have the vehicle PROPERLY diagnosed. You describe an issue which could be almost anything -- that's the TRUTH!

Have the vehicle PROPERLY diagnosed by a qualified/certified technician - BEST ADVICE

Posted on Mar 26, 2011


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Why does my 89 pontiac 6000le idle slightly rough after having the fuel injectors replaced? The reason I had to have them replaced was because of the ethanol in todays fuel ruined the original fuel in

If it is idling like it was before the inj were replaced then you have fixed the wrong problem the ethonol doesn't damage injectors you probably have a spark plug wire that is bad or a coilpack is bad or you have a fouled spark plug? A compression test can tell you of any problems with the valves! The injectors are designed to be compatible with flamible liquids ie gasoline or alcohol! I have been a mechanic for 23 years and have never seen inj fail due to alcohol in today's gasolines! You might have been scammed? Anytime you have repairs done request your old parts to be returned to you! You might have to take the mechanic who claimed he replaced your inj to small claims court! Try replacing the plug wires and the spark plugs first if no change then get carburetor cleaner and with the engine running spray the inside of the throttle body where it is black with the throttle open and engine rpms increased if that doesn't change it the coil packs might be going bad there are three so buy all three as a set so you don't have to change them at different intervals! Depending on mileage the timing belt is reccommended to be changed at 150,000 miles the spark plugs are due at 100,000 the coil packs should last over 200,000 miles so I'm guessing it is time for major preventative maintenance? The timing belt being worn can cause rough idle too!

Jan 16, 2015 | Pontiac Cars & Trucks

2 Answers

Still having problems will not run good. 1997 ford 2.0 escort;new plugs&wires coil;fuel pump still codes 0351;

From a reputable repair website:

P0351 - OBD-II Trouble Code

Auto Systems and Repair

Ignition Coil "A" Circuit Primary/Secondary Malfunction Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0351 Ignition Coil "A" Circuit Primary/Secondary Malfunction
What does this mean? The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
Code P0351 indicates there's an electrical problem in either the primary ( the computer side ) or the secondary ( the spark plug side ) of the Ignition Coil "A" Circuit.
  • Check Engine Light will illuminate
  • Engine idles rough
  • Engine misfires on acceleration
  • In rare cases, the engine may not exhibit noticeable symptoms
Common Problems That Trigger the P0351 Code
  • Defective Ignition Coil(s)
  • Defective Spark Plug(s)
  • Intake Manifold Vacuum leaks
  • Carbon buildup in the Throttle Body air passages
  • Defective Idle Air Control Valve or Electronic Body
Common Misdiagnosis
  • Ignition coil(s) replaced when cause of the malfunction was a vacuum leak
  • Spark Plugs replaced when cause of the malfunction was a vacuum leak

Dec 21, 2014 | Ford Cars & Trucks

1 Answer

Free online auto repair manuals

Did you use factory spark plugs? Try cleaning the throttle body.

Nov 09, 2017 | Mazda Cars & Trucks

1 Answer

2004 Chevy Trailblazer idles rough. Idles ok when started up, but after warmed up it idles really rough when stopped.

If it has not pulled any codes (idiot light). Clean your throttle body, and change your spark plugs with A/C Delcos #41-103, most other brands will cause rough idle like Autolites and Bosch. This would be a cheap way to fix this problem.

If by chance you have just recently changed the battery or had the battery unhooked. Let me know, it's an easier fix that costs virtually nothing.

Nov 18, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

How do I know when it's time to replace a timing belt on my 2003 Sorento? A local mechanic said it idles rough because the teeth are breaking off on the belt. How would he know that by just replacing spark...

It's unlikely that the cam belt would cause rough idle!!
normally you would change the cambelt after so many miles Mine are always changed after 30k miles regardless. The mechanic was purley guessing.

If the idle is rough then it will be an electronic fault like air flow meter,EGR valve, Idle control unit. etc

Get back to me if you need more info.



Feb 01, 2010 | 2003 Kia Sorento

1 Answer

Idling rough. The coils and spark plugs have been replaced but still idles really bad in my 2001 Lincoln LS. The car has 72000 miles

id clean the throttle body before spending more money on anything else, as carbon build up can cause rough idling.
you can clean it with throttle body cleaner, or just gasoline and a toothbrush, then wipe off the build up.

Jun 29, 2009 | 2001 Lincoln LS

5 Answers

I have a 2000 hyundai grandeurmy car idle rough, had duel injecters cleaned but it's still the same. now its sluggish when you take off and they say its a problem with a one cylinder is not working they...

If it is not firing on one cylinder, check and eventually replace distributor rotor, or electronic injection module.
Check also for camshaft problems.

Oct 07, 2008 | Hyundai XG300 Cars & Trucks

1 Answer

Rough idleing

Did what in a tuneup? If done yourself, are you sure everything is connected correctly? Spark plug leads?
Was it running OK before the tuneup?
Was the throttle/ throttle body touched at all?
Carbon can build up in the throttle body of the Corolla, which (will/ may) eventually interfere with the throttle butterfly seating properly. Too much air is available at idle, can cause rough running.
If the idle bypass air was "adjusted" at tuneup, maybe it was incorrectly done.
Did anyone change the spark setting?

May 26, 2008 | 1993 Toyota Corolla

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