Question about Cars & Trucks

1 Answer

Chevrolet Uplander 3.9L intermittent knock until warmed up

On a 2009 Chevrolet Uplander with 3.9L engine, 44,000 miles, has an intermittent engine noise like a knocking and it goes away when the engine has warmed up - do you know what might be causing this, or does anyone else have this problem?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Master:

    An expert who has achieved Level 3.

  • Cars & Trucks Master
  • 818 Answers

Could it be a high pitch knocking like a ticking-this would be a lifter thats not pumping up right any-it may be time for oil change to winter oil-5w20-oil change could help anyway-cheers Denny

Posted on Nov 19, 2013

Testimonial: "maybe a lifter but it has synthetic oil now and did it when it wasn't so cold also - thanks"

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 66 Answers

SOURCE: IN THE MORNING FIRST START SOUNDS LIKE TAPPING AND KNOCKING NOISE

ck intake gaskets make sure there is no antfreze mixing in oil and breaking oil down if gakets are ok run a factory oil filter and go up agrade in oil such as 10w40

Posted on Dec 17, 2008

  • 1 Answer

SOURCE: Engine make Knocking noise when cold

I have the same problem on my 2.0L 2001 Legacy auto. It began about 1000 miles ago. It has now done 84k. From my online searches this is most probably 'piston slap', and is not serious. To save weight Subaru shaved down the skirts on the pistons. With normal engine wear the pistons will at some point rattle against the cylinders until the engine is heated up and the pistons expand. The rattling should go away after a few minutes. If it persists say 10-15 minutes, it may be another problem.

Posted on Nov 26, 2009

ZJLimited
  • 17970 Answers

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.

Posted on Sep 08, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Sounds like a diesel on a cold day


could be a knock sensor or rockers knocking until oil warms up and oil pressure seals the lifters

Sep 27, 2012 | 1995 Chevrolet Silverado 2500

1 Answer

2009 CHEVY COBALT WITH 44,000 MILES. WARRANTY WAS 3YR/36K. GETTING SERVICE AIRBAG LIGHT. GM WANTS $88 TO DIAGNOISE AND MORE TO FIX SINCE WARRANTY HAS EXPIRED. IS THEIR A WAY TO RESET COMPUTER TO SE IF...


Unfortunatly , you need a diagnostic reader to do this , but i would suggest to take to a local auto bosy repair shop , ask if they can check it to see what may be wrong , promise them if you are ever in a accident you will take your car to them , they may check the code for free , it should only take a couple of min to do

Sep 14, 2010 | 2009 Chevrolet Cobalt

1 Answer

2005 uplander... temperature dial on cool, getting warm air


sounds like the air mix rod is out of adjustment or if vacuum controled, its leaking can you hear a noise in the vehicle or can you find a vacuum hose off in the engine bay hope it gives a little help

Jun 07, 2010 | 2005 Chevrolet Uplander

1 Answer

Steering stiffens up at start.


low on steering fluid...possibly and needs to warm up to work properly. or belt may be a problem...have that checked for tightness and security.

Sep 30, 2009 | 2007 Chevrolet Uplander

1 Answer

Bought used 2008 Malibu 44,000 miles. Beautiful,


Was there a head wind?
I would say try it a little longer at different speeds and situations.
They are know to be VERY GOOD on fuel.

Aug 25, 2009 | 1999 Chevrolet Malibu

1 Answer

Noisy rattle in engine compartment of 2003 Impala on cold start.


Take a broom handle(with the broom removed) or long heavy dowel rod , start the engine when cold and place one end of handle to your ear and the other to different parts non-moving parts of the engine compartment,including the engine to narrow down  the location of the noise. 

Dec 22, 2008 | 2003 Chevrolet Impala

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

148 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

75117 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...