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?
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.
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.
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.
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---
TAPPING / KNOCKING NOISE FROM ENGINE AT COLD START
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.
IF YOU CONFIRM:
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.
ACTIONS:
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.
NOTE:
• 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
label.
• 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.
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. :)
Most of us know
how the injectors get clogged. Its nothing else but the fuel that we use which
causes clogging. Every time we turn off our car's engine, last drop of petrol dries
on the nozzle of the injector and leaves behind deposits. These deposits become
firm with the heat of the chamber. The more we drive our car, more deposits
accumulate. Gradually it starts to restrict the flow of petrol from the tiny
hole on the nozzle and the injector starts to lose its efficiency. This causes
the engine to lean misfire and hesitate on different rpm, power and pickup is
lost, the car becomes uneconomical on petrol, unburnt fuel can be noticed in
the emission and worst of all the wear of engine becomes faster. Only 8% to 10
% clogging in the nozzle can cause all this
Proper cleaning can restore their like-new performance. There is no need to replace fuel injectors unless they are actually gone bad. Injectors are designed in such a way that they are not very convenient to clean. They are sealed units and cannot be opened for cleaning. Ultrasonic cleaning is MOST effective process for cleaning fuel injectors. It is cheap and comprehensive solution for the problem.
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