Question about 2001 Volkswagen Jetta TDI

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Engine noise at idle

What would cause top engine noise at hot idle

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  • harym Jun 12, 2008

    looking for an answer on top engine noise at hot idle on a 2001 Jetta

  • lorna1lellio Mar 15, 2009

    knocking when engine is hot 96 petrol sharan sounds like cam noise engine has done about 78000

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  • 13 Answers

An injector could make it sound like an engine knock it s called a diesel knock

Posted on Jun 12, 2008

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I have a1995 GEO prism it runs good but when I let off of the throttle it won't idle unless I keep my foot on the throttle


Clean the throttle body and idle air control motor. Just a cheap start. Could be the engine is old and tired.

Sep 07, 2015 | Geo Cars & Trucks

1 Answer

How to adjust idle?


hot engine ?, cold or both,, EFI runs in 3 modes, cold ,warm and hot.

name it.

which engine option (displacement)??????



there is no idle adjust, that is the PCMs, job 100%, all the time.

Carbs are gone.

here is rule one for all EFI.

idle is the last thing to work correctly.

anything the causes a gross imbalance of engine power to engine load, under idle will cause , idle controls to fail.



low idling causes. (over 50 but, here ar basics)

1: AFR (air fuel mixture too lean) usually surges. (clogged or leaking injectors. or fuel pressure way to high)

2: air leaks, cause racing, so not that. (speed density car ,if is)

3: egr stuck open. low idle and misfire.

4: ISC stuck closed (IAC electric)

5: cam belt slipped, timing retarded, compression at 1/2 spec, and well, valve will bend soon....

6: CEL glowing running? can be in limphome, limp cancels Idle controls (in may cases) RTM read the FSM on DTCs.



if fails hot?, is hot = 180F temp or more? "thermometer time"

if not, the PCM goes , quite nuts.

Dec 23, 2013 | 2010 Honda Civic LX

1 Answer

Motor shuts off when started up,shuts off when driving.


hot engine or cold, or both? 180F+ is hot.
Shuts off, idling or on the fly, say at 30mph right foot down it dies?
just clue here...
engine stalls. is complex. but in the macro its below, using tools finds the reason,, but you never said did it restart easy./??????
1: lost of engine compression hot engine, (or overheated)
2: lost 12vdc electric power at stall (caused it) dash goes dead. ?
3: lost spark, test spark at the failure point. if dead trouble shoot speak.
4 bad fueling, too lean (say the fuel pump dies) or too rich.
too rich causes wet spark plug tips. (lots of causes )
5: stalls due to idle RPM too low, below 800 is too low.
too low idle rpm is caused by many things, but top 2 are.
A: EGR stuck wide open, clean it, as the books shows at 60k miles
B: ISC stuck closed. (same deal clean it)

now repost and say when it stalled,
at a read light or flying up a hill wot, wot= wide open throttle.
and when it dies, is the restart easy or hard.

Dec 05, 2013 | 1997 Jeep Grand Cherokee

1 Answer

Engine makes high pitch sound


sounds like a vacuum leak check for cracked vacuum lines

Sep 03, 2013 | 2003 BMW 325

1 Answer

Ford explorer idling too high


High idle is in almost all caused caused by a vacuum leak on the engine, get a can of carburetor spray and spray around the top of the engine, if you hit a leak it will make the engine sound different and there will be a sucking noise. Also check for hoses that are leaking that connect to the intake vacuum source. If no leaks are found you will need the system scanned for faults in the idle speed control system.

Sep 10, 2012 | 1993 Ford Explorer Limited

1 Answer

Overheating


CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.

Jul 17, 2011 | 1999 Oldsmobile Alero

1 Answer

Load humming noise comes through air filter


too little information to go by..humming noise..what year/model/engine etc....

however i assume it s a ford and it is most likely caused by a sticky idle air control valve...they tend to hum and "hoot" when sticking, this may be associated with stalling at idle and/or hard starts unless aplying gas pedal. you can identify the idle air control valve as it is attached to most of the engnies by 2 botls and has about a 3-4" silver tube extending abaw from bolts, it is on top of the engine. when these make noise and backfeed through the air box a vibration can be felt from it. there will be a wire goinf to the valve, unplug it whil engine is running and when you hear the humming..if noise gone once it is unplugged...replce it WITH A FACTORY PART!!!

hope this helps

Mar 23, 2011 | Ford Explorer Sport Cars & Trucks

1 Answer

Loud humming noise coming from 03. Pt cruiser with turbo. You can only hear the sound when excelerating. When hooked up to the computer at the parts store it says something about the emissions. Any...


It appears that the bearing and seal on the turbine shaft of the Turbo have failed causing the noise of a worn bearing and oil leaking past the seal into the exhaust system. Continuing to drive it will eventually remove all oil from engine if not topped up. The Turbo needs repairing urgently before any more damage occurs.
Turbos get very hot during brisk driving and need to be allowed to cool down before turning off the engine to prolong bearing and seal life. It is recommended to allow engine to idle for at least three minutes before switching off to allow the circulating oil to bring turbo down to a reasonable temperature.

Sep 28, 2010 | 2002 Chrysler PT Cruiser

1 Answer

Noise at shut down


The noise is caused by the engine running on after the ignition is shut off. It makes noise because the pistons are rattling in the cylinders from incorrect timing. This has nothing to do with the mechanical or electronic timing of the engine. The engine runs on either because of hot glowing carbon deposits in the cylinder head or because the engine was shut down when it was running too fast. Sometimes the carbon can be literally blown out by running the engine at high rpm for a short time. Put it in second gear and run it for a couple of miles on the highway. If this does not work the heads will have to be removed and the carbon cleaned out manually. The shut down when running too fast problem can be caused by the idle being set too high or by shutting the engine off before it has reached idle speed. If you can adjust the idle speed try reducing it. If not always hesitate before shutting the engine down to let it reach idle speed. Good Luck!

Mar 20, 2010 | 2001 Ford F150 Styleside SuperCrew

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