Question about Hyundai XG300

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Rpm increasing to 4 at 40 km/hr and then kicking back to 1.5 rpm,this problem happens once or twice daily

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  • Anonymous Mar 12, 2014

    engine dashboard light is on

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Check your transmission fluid.

Posted on Oct 24, 2008

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Posted on Jan 02, 2017

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I have a 2009 VW Crafter loon wheelbase mini bus with gearbox problems. I believe it has an 'HQT' model box. It revs at 3,000RPM at 62 MPH. Is there a higher ratio gearbox that can be fitted.


check around gear box repair shops to see if there is a replacement box that has an overdrive gear (5th)
if it is an automatic , the problem may be that overdrive is not coming in and that will drop the rpm 250 rpm and increase the speed up to the 75 mph mark
there is nothing wrong in the box as the rpm and the speed are about right in relation to the diff ratio(not mentioned )
3200 rpm with a overdrive manual runs around 74 mph or 120 km/hr
another method is to put a diff in with a taller ratio
example --current 4.1 back to 3.2

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The speedometer on my toyota D4 corona premio suddenly drops when i step on the accelerator with the intention of increasing my speed. when i try to speed up the vehicle almost stops but moves smoothly on...


wow, no year stated,
over 100 things, do you want us to guess? or advise tests.
????
never did a full tuneup tops all lists, every-own skips this.

this is called (if rpm is low) low engine power
caused by
misfiring,
starving for fuel.
or sick engine(means vast things, but slipped timing belt(tune up)
???
my guess is you seek wild guessing
but will not.
just finish that tuneup skipped at 60,000 miles, and magic can happen.

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1 Answer

The RPM of my engine remains at 4000 while my speed is 120 km/hr


I guess that you have a manual transmission. If that is the case you have a clutch on the way out. Slow slippage that gets worse as the plate gets hotter. If an automatic it is possible that the overdrive is not holding due to low pressure in the box. Have a pressure test done on the box--- have the fault codes read. From experience 120 kph is around 3200rpm for most cars and the 800 rpm difference indicates that the o/dive is not working as it should.

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The Turbo Charger does not seem to engage .I was led to believe that after around 30 miles per hr. it would be like haveing a passing gear. Oh yes the car is a 1984 Nercedes SD 300 series Desiel.


The turbo charger has more to do with rpms than road speed.The turbo uses exhaust gas leaving the engine to push more fresh air into the engine thus creating higher compression and more horse power.You should feel some boost above 1500 rpms if everything is working properly.If not then you should have the system checked by a dealer or a good diesel shop.Good Luck!

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What will cause my Toyota Hilux to smoke with loud engine noise at high rpm? When accelerated to speeds of approimately 130km/hr, the engine races of, which feel like no control to the vehicle, smokes (...


If there is a blockage in the engine breather, that can cause this to happen and if not corrected, in a diesel, can cause runaway and it will destroy itself.

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RPM drops to zero at idling after engine accelerates when warm


This may been an ignition module or a MAF sensor, this car may need to be diagnosed using a OBD I computer code reader to accurately diagnose the problem.

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2006 sprinter 2500 140 wheel base Noise in drive train


check to see if the harmonic balancer has slipped if it looks good my next question would be have any of the u-joints been replaced and if they have there may be a balance problem there also greasing u-joints might effect it. Let me know. dc

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RPM problems


It is the new variable cylinder management the same thing happened on my 2003

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