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Knocking in my 6vd1

I start it up and it makes a knocking noise i put it under load and the noise goes away

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  • Isuzu Master
  • 76,673 Answers

Have the crankshaft harmonic balancer checked it may be coming apart.

Posted on Oct 30, 2012

Testimonial: " thanks hopefully this will solve my problem"

  • matthew Oct 31, 2012

    thanks hopefully this will solve my problem



6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: knocking when first start engine

Depending on the period of time and intensity of the knock ? If it is a rapid short ,loud knock then disappears altogether you may be dealing with a cam chain tensioner that is loosing oil pressure when the car is standing. A loose cambelt tensioner can increase the noise .

Posted on Jul 29, 2008

  • 233 Answers

SOURCE: 1990 Camry Lifter Noise

there should be small white nyon washers that keep the rockers from rubbing - alot of the time, these washers will break down,and "dissolve" and no one will ever know they were there.. if you go to the toyota dealer parts dept, they can pull a blown up view of the head and get the part number for those washers... install them as shown in the blown up diagram, or your chiltons/ haynes manual, and the noise will be gone!

Posted on Jan 12, 2009

  • 4 Answers

SOURCE: knocking noise from air evap unit

2 fixes - read on - one quick and one long and hard
(little tip - take pics (camera phone) rather than try and remember how it should all go back together)

the knocking is a motor and gears that move the fresh air/recycle flap - it is up behind the dashboard behind the glovebox
the problem is that the gears wear and become misaligned
the flap then can not open fully, its doesnt reach its end stop which switches the motor off
so the motor keeps going the and the gears keep clicking over

the big cylindrical thing you are seeing is the blower motor - it should have a red and a black wire going to it

1. quick fix first
remove the wires to the blower motor
undo the 3 brass coloured cross head screw from around the blower motor
remove the blow motor and fan
turn on the ignition and put the air flow to fresh air (i.e not recycle)
the knocking should start
lay on your back with your head i the footwell
with torch and hands locate the motor/gears that are knocking
find the wires to the motor and remove or cut them (if cutting turn the ignition off first !!!)
make sure the flap is in the open position, tape,jam or wire it open (who uses the recycle position anyway ??)

2. long hard fix
remove the blower motor as described above
this leaves the fan casing
from the engine bay remove the plastic cover from the top where the windsceen wiper motor is (just below the windscreen)
depending on model you may have the engine management CPU on the right handside - this may need removing
on the right hand side there will be 3 (maybe 4) bolts just above where the fan housing is
undo these - note i have seen these with the bolt head in side the car and some with the bolt head on the engine side - dont know why ???
if they are inside the car - you need to remove air trunking, repostion wires and get a long thin socket extension and some flexible bit to be able to get a socket on the head.

once all this is out - locate the motor/gear making the noise (as above)

remove the motor wire and after removing any more obstructing object remove the motor and gears- you will need to be very flexible and have a good range of flexi and rightangle drive socket bits

now all you need to do is purchase the new gears (if peugeot have any) rebuild it all and refit, then put everything back as you found it

shouldnt take more than a day or two, or a finger or two

Posted on Feb 14, 2009

  • 9 Answers

SOURCE: Cold Engine Knock on 1998 Dodge Neon.

sounds like a lifter my ford f150 does the same thing when its cold but then quits when it gets warm or it could be a weak oil pump. (just some thoughts)

Posted on Feb 17, 2009

  • 1564 Answers

SOURCE: knocking noise in 2000 beetle under 1000 rpm

You might need a new Knock sensor.

Posted on Aug 13, 2009

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1 Answer

Where is the knock sensor on my 2004 Isuzu Rodeo?

yet another easter egg hunt 10,000,
and no engine stated, as are most here.
USA car? (canada?)
first off the old V6 is in the block valley (6vd1) engines.
I bet its not bad,
if you scanned the PCM and no error for knock why ask?

2004 here is 3.5L engine it has only 2 elect pins, (a give away)
has a center hole bolt (block of plastic)
and has 2 knock sensors, that year,
that year had 3.2 liter too, why post lacking DISPLACMENT
and cam counts, 4 cams? 6ve1? engines?> has 2.
the look like below, 2 pins center large bolt hole
most times all KS are on the block somwhere
on the early engine on top valley (intake man pulled.)
later they move them ,putting a KS on a head is crazy
as it must then HEAR valve noises, and caM, (yes its just a microphone) it does hear. knock.
and in 3 dimensions (3D). best place was on top.
but if you put them on the banks then you need 2 for obvious reasons.
it cant be on the pan , nor front or rear of engine leaving
where bank sides, "V" see?
It must hear all cylinders fire, per bank. (rules not too close not to far)

k1-akgy0jmi3zm3dcjo5njpmo5v-3-0.jpg its not here, as seen the old V6

6vd1 (old) knock dead center, now gone from there.

35a-akgy0jmi3zm3dcjo5njpmo5v-3-3.jpg bolted to side of block, both are identical.

Mar 11, 2017 | 2004 Isuzu Rodeo

1 Answer

Where is the knock sensor for my 96 isuzu rodeo v6

YAEEH (yet another easter egg hunt)
why do you ask. scan it and it has DTC for knock? nah, bet not.
be best to scan it, no?

usa RODEO.
GM V6 engine with their own 3.2-liter 24-valve SOHC V6
LG6 , i think ended in 1992.
3.2 L 6VD1/6VD1W V6 (bingo)?

ill toss coin, land on 6vd1

some dont have a knock sensor. the 2.6L does.
the 1998 6vd1 has one, but not 96, in usa.

I even looked at your ECU/CPM schematic,
for the V6, and it shows, no knock sensor,(usa spec car)
The EFI spark system used on your car dictates this.
as knock (KS) controls spark timing, (retards it at knock)
but some versions have no KS sensor.

if fitted its on the block top.
has 1 wire. and screws in on a simple stud .
some are under intake manifold
its just a threaded shallow hole in block,
its only a microphone device.
here is the block a real photo.
some have it , others, dont
and one more fact, it came 92 and went and came.98

clear? see red circle below?


Mar 04, 2016 | Isuzu Cars & Trucks

1 Answer

2001 azteck 49000 miles use very little once every

The 3.4L engine has special pistons that are designed to expand as the engine heats up. When the engine is cold, the pistons make a knocking sound that resembles lifter noise or piston slap. As long as the noise goes away after the engine warms up, don't sweat it; this is normal.

Sep 17, 2014 | 2001 Pontiac Aztek

1 Answer

My 2003 x5 bmw 4.6is, makes a knocking noise in the Engine upon stating it up, but usually goes away after a few seconds.

Sounds like excess bearing clearance, when the engine sits overnight the oil between the bearings and the crankshaft is able to run back into the oil pan. When you first start it up it takes a few seconds for the oil pump to fill the spaces back up and you get some clatter.

Jul 26, 2014 | 2003 BMW 5 Series

2 Answers

Loud Vibration / Sound Under Acceleration And Starting Engine.

Get the engine mounts checked. A bad mount may allow part of the engine to lie on a body or frame part, allowing engine vibrations to become very loud. Torquing of the engine (under load) can cause the same type problems.

May 03, 2017 | 2005 Dodge Neon SE

1 Answer

Makes clicking noise while under load.

Sounds like you have a defective universal joint or constant velocity joint in the drive line.

Feb 07, 2012 | 2004 Chevrolet Avalanche

1 Answer

Knocking knoise under 1500 rpm

If your car has hydraulic tappets and low low oil pressure at engine speeds then it can make tapping noises. Oil pressure is needed to maintaine the tappets clearances, excessive cleaeances will produce noises.

Jan 30, 2012 | 2000 Pontiac Sunfire

1 Answer


Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

Jun 14, 2011 | 1994 Pontiac Grand Prix

2 Answers

I have a 2003 Chevy Impala. I ran my car with no oil and now I'm hearing a loud ticking/knocking noise coming from under my valve cover. I added 2 bottles of oil after finding out that I didnt have any...

might be the valves have been damaged running without oil
- or the crankshaft / camshaft / main bearings
most probably you have to let the engine be rebuilt by a mechanic
(expect cost of more than US$ 2.000)
or get another (used) engine at a scrapyard 2003-chevy-wutfveiel3ypko01ydor435x-5-0.jpg 2003-chevy-wutfveiel3ypko01ydor435x-5-2.jpg

Sep 14, 2010 | 2003 Chevrolet Impala

1 Answer

Experiencing a "ticking" "knocking" type noise when 1st starting the car in colder weather that goes away once the blazer warms up , any help ?? I was told it could be the exhaust manifold , or piston...

it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise

Oct 26, 2009 | 2002 Chevrolet Blazer

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