2003 Mazda MPV Logo

Related Topics:

Posted on Sep 10, 2008
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

Upper engine knocking

When at an idle, I hear a knocking noise coming from the top of the engine, when standing in front of the car. Could this be a loose valve or are they auto adjust? This is a 2003 MPV with 68,000 miles.

Thanks for your help

Answer This Question
  • Shredchuck Nov 18, 2008

    Thanks for your feedback on this. This is more of a click, rather than a knock, so I will try the valve additive or kerosene.

    Cheers

    Shredchuck

  • Steve Allison
    Steve Allison May 11, 2010

    Define 'knocking' a bit better; there isn't much in the upper engine that can produce a hard sound; valves, if they have too much clearance will 'click' rather than 'knock.'


    To learn if you have hydraulic or mechanical valves, check your owner's manual. If you find a maintenance interval that specifies 'valve clearance check' or adjustment, they are mechanical.    


    If you find they are hydraulic, try some (often doesn't work the first time) valve additive. This may require an oil change after a specified mileage.


    Since I'm old, we would just dump a quart of kerosene into the crankcase, let the engine run at an idle or just drive it gently a few miles and then an oil change. 

×

1 Answer

Anonymous

Level 2:

An expert who has achieved level 2 by getting 100 points
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.
Sergeant:

An expert that has over 500 points.

  • Expert 324 Answers
  • Posted on Nov 26, 2008
Anonymous
Expert
Level 2:

An expert who has achieved level 2 by getting 100 points
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.
Sergeant:

An expert that has over 500 points.

Joined: Nov 26, 2008
Answers
324
Questions
2
Helped
156461
Points
684

I suggest if you know how to work on cars, adjusting your lifters, this is the common problem with those motors.

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

0helpful
1answer

Engine has a knocking on start-up, noise quiets during idle, but knocking returns during acceleration. Any ideals about possible causes? It's a Toyota 2009 Camery with 2.4 engine and 75,000 miles.
you tube says the variable timing gear/s is going bad will need the gears replaced . tack a handle off a wood handle off a toilet pluger hold the one end on yer ear over ear canal place the other onto the spot near the front of motor near gear listen at start up move the stick handle up and down the engine at 4 places on top of the valve cover from front to other end what do you hear is it load over the gear hear the knocking or is it some place near the middle of engine ? nois over cam gear end probably cam gears or chain tensioner ect
Read full answer
Jan 06, 2018 • Toyota Cars & Trucks
0helpful
1answer

Knocking engine ?
Are you sure you are not hearing a popping noise from upper intake and throttle body because of a intake valve burnt or sticking open. Do a compression test on all six cylinders to see which one is low.
Read full answer
Jul 19, 2014 • 2003 Buick Century
0helpful
1answer

What could be wrong if I hear a knocking in the front of the engine and the engine is hard to start, as well as the engine will not idle?
Automatic idle module isn't working. Isolating the knock is going to be more difficult. There are many reasons an engine knock develops. It will take a good mechanic to tell for sure.
Read full answer
Jul 12, 2014 • 2004 GMC Envoy
0helpful
1answer

When my 98 regal is idling there is a knocking noise coming from under the front floorboard
Have it put on a lift and see what the noise is from.
Read full answer
Mar 19, 2014 • 1998 Buick Regal
0helpful
1answer

I hav a knocking noise under the hood of my jeep cherokee. I recently had the upper ball joints replaced and the knocking stop for a while and now its back full force. The noise sounds like its coming...
Knocking in the engine varies from simple failure to detonate to you are about to throw a rod. This is something that can be difficult to diagnose and if misdiagnosed, costly to repair. I would take that in to a mechanic as soon as possible. Barring that, I would check all your spark plugs.
Read full answer
Feb 14, 2014 • Jeep Cars & Trucks
0helpful
1answer

Knocking noise in engine of 2002 Nissan maxima
This is hard to say with hearing the noise but try to pin point the noise , is it coming from the top or bottom of the motor , the knocking noise could be a bearing in the lower motor or may be something else making it sound like a bearing,
Read full answer
Oct 05, 2012 • 2002 Nissan Maxima
1helpful
1answer

Hi! I have a jeep 2001 Laredo and a noise is coming from the engine.I wanted to sell the jeep but how can i get this fixed?Some mechanics do not want to get involved! Thanks!
Depends on the noise you are hearing and how the engine is performing with the noise versus before the noise came along. It come be something as simple as an idler pulley making noise which is replaceable in 10mins or crankshaft main bearings knocking which would be more cost/time effective to replace the engine. Need a better description of the noise to diagnose online. Top/bottom, knock/tick, does it go away when idling/under load etc... the more details the better.
Read full answer
Jun 08, 2011 • 2001 Jeep Grand Cherokee
0helpful
1answer

Intermittent noise not a misfire sounds internal like a rod or valve or lifter. No check engine light, car has good power. U only hear noise after car is warm and not all the time. Could it b my belts? Any...
After it's warmed up to operating temp, if it makes the noise at idle but goes away reving the engine, I would guess that a lifter has gone bad. Rod bearings as a rule knock all the time. It's hard to diagnose these things over the internet, because there are so many variables when it comes to noises.

You need to warm the car up and then while it is running, open the hood and try to pinpoint the source. lifter noise will sound like a "tick" and come from somewhere near the top. Rod bearings will sound like a 'knock" and will come from the bottom of the engine.
Read full answer
Jan 25, 2011 • Ford Crown Victoria Cars & Trucks
0helpful
1answer

I have a 1997 2.5 jeep wrangler.when you first start the engine it runs and sounds fine, then after about 20 seconds it begins to have a knocking sound only at idle. when you press the gas you cant hear...
It may be piston slap. This is caused by either engine wear with the piston bores being too large for the pistons, or by poor manufacturing tolerances, or a combination of both.

To test for this, start the engine up first thing in the morning and run it for about thirty seconds while you listen carefully and memorise the sound and intensity. Turn the engine off quickly, remove the spark plugs and put two squirts of motor oil into each cylinder. Reinstall the plugs, start the engine up again and listen. If you have piston slap the noise will have been greatly reduced or even eliminated for about thirty seconds seconds and then returns.

The fix is to rebuild or replace the engine, but if it works just fine then don't worry. Many slappy engines keep going for tens of thousands more mile. The fact that your knocking is only at idle suggests your crankshaft is not to blame.
Read full answer
Sep 26, 2010 • 1997 Jeep Wrangler
0helpful
1answer

Have a1997 2.5 jeep wrangler. when u start the engine it runs and sounds fine but after a few seconds it starts a consistant knocking noise. removed valve cover and all the valves seem to be working right....
If a knocking sound occurs at idle, a bearing for the camshaft or the crankshaft may be bad.
Read full answer
Sep 24, 2010 • Jeep Wrangler Cars & Trucks
Not finding what you are looking for?

View Most Popular

2003 MPV

  • Cars & Trucks

Related Question

Engine has a knocking on start-up, noise quiets during idle, but knocking returns during acceleration. Any ideals about possible causes? It's a Toyota 2009 Camery with 2.4 engine and 75,000 miles.

  • Toyota Cars & Trucks

Related Topics

408 views

Ask a Question

Usually answered in minutes!

Popular Questions

Replacing headlight bulb on a 2003 MPV

2003 Mazda MPV

Mazda tribute firing order. I have miss fire in

2001 Mazda MPV

Mazda bongo 2.5 turbo diesel 1996. over heating

1996 Mazda MPV

My 2005 mazda mpv's fan

Mazda MPV Cars & Trucks

Mazda MPV: how to raise power window manually?

Mazda MPV Cars & Trucks

Check Out the Latest Top Trucks Report!
Check Out the Latest Top Trucks Report!

View all Fixya Reports

Top Mazda Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

7339 Answers

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

Answer questions

Manuals & User Guides

Loading...