Question about Hyundai Accent

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Sound inside the engine

Recently i cleaned the injectors of my vehicle, after cleaning i felt that original power is restored. and i drive it for about 20KMS the power has gone there is knocking sound coming from inside the engine. what will be the major cause for this?

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Does the knocking sound increase with engine speed? Check all the things run by the belts, like A/C, alternator, etc. by removing the belts and starting the engine. If there is no more knocking, then check those components. If the knocking is still, you may have an internal engine problem like main or rod bearing failures. Check the engine oil for any metal flakes.

Posted on Feb 03, 2015

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Posted on Jan 02, 2017

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SOURCE: 2002 Taurus 24v OHC

Check engine light is frequently a loose fuel cap, but the other problem could be a bad fuel pump, or a clogged fuel filter. Try the fuel filter first - its the cheapest.

Posted on Jul 25, 2008

  • 1779 Answers

SOURCE: oil light goes on and off and engine has a knocking sound.

This sounds like severe engine damage, do to loss of internal lubrication (no oil). That's the bad thing about 'idiot' warning lights, they come on when u have a severe problem, and the damage is done. You are going to probably have to purchase a used engine from an auto salvage yard, or purchase a re -manufactured engine. Sorry for the bad news, this is about as bad as it gets.

Posted on Nov 14, 2008

  • 232 Answers

SOURCE: i have a 04 ford f250 6.0 liter diesel and when it


Posted on Oct 23, 2009

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SOURCE: Infiniti G35 - 2006 Sedan

Smoke on start? Could be a valve problem where all your oil is in the bottom at start? Belts are squeaking too? Maybe a tensioner went bad?

Saw this service bulletin---

This bulletin amends ITB02-049. This version amends the Applied Vehicles.
Please discard all paper copies of the earlier version.
APPLIED VEHICLE: 2002 - 2004 Q45 (F50)
2003 - 2004 M45 (Y34)
2003 - 2004 FX45 (S50) with V8 engine.
A tapping or knocking noise (similar to a piston or valvetrain noise) when starting a cold engine,
NOTE: The engine is considered “cold” when it has been OFF (not running) for several hours.
1. Dislodge and remove any carbon deposits that may have caused the noise and confirm that carbon
deposits were the cause of the noise.
• While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then
release the accelerator quickly, as soon as the engine reaches 4,000 RPM.
• The noise should disappear immediately if carbon deposits are the cause.
• If the customer reported a noise that exactly matches the symptoms listed above, but you cannot
duplicate it, the cause may still be carbon deposits. Go to step 2.
• If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match
one described above, go back to ASIST for further diagnostic and repair information.
2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner
P/N 999MP-FSC00P to a full tank of fuel (in the vehicle’s fuel tank) according to the instructions on the
• This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as
cleaning other components of the fuel system.

Hope helps.

Posted on Sep 08, 2010

  • 246 Answers

SOURCE: 2001 land rover Disco II td5 not starting - no fault

Check the crank and cam position sensors...sometimes they don't kick the SES light on until they fail. one of the main symptoms of the cam position sensor failing is the "no start, but cranks fine" issue. This happens especially when the engine has been driven and is warm. If the sensor has failed, the engine won't start at all, and everything else will seem fine..the part is usually cheap at the store, and usually easy to replace since it will be near the top of the engine somewhere. I'd start with that and see how it goes...The other sensor I mentioned is also critical in the timing of the engine the "crank sensor" if it fails, it may also cause that situation. The two sensors together tell the CPU where the cam and crank are in their timing sequences. If one isn't working, the CPU won't know where to fire what cylinder, so it just won't fire any of them. ie: No Start. I would replace them both just to be sure. Since you have checked everything else, and it cranks, I can't think of anything else at this point. Good luck. :)

Posted on Jun 09, 2012

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