How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Eric Your Own Question

Eric
Eric, Automotive Repair Shop Manager
Category: Mercury
Satisfied Customers: 24208
Experience:  20+ yrs. experience as repair shop manager and technician.
3195632
Type Your Mercury Question Here...
Eric is online now
A new question is answered every 9 seconds

2007 mercury mariner: knocking..engine while idling..rev..oil change

Resolved Question:

i have a 2007 mercury mariner and yesterday i noticed a slight knocking coming from engine while idling. when i rev it up its gone, up to now the truck has been running great. it had a recent oil change and i checked the level and it was good, i checked the water and it was good..any suggestion before i drop in at the shop
Submitted: 3 years ago.
Category: Mercury
Expert:  Eric replied 3 years ago.
Hi,

Is it a high pitched metallic sound, or lower deep sounding knock?

Does it matter whether the engine is cold or hot?

Can you tell by listening to it if it is coming from the front of the engine, or more towards center of engine?
Customer: replied 3 years ago.
sound is a faint tapping sound

engine was hot at time, i will go start it up right now its cold,i just started up car and you can here it still but engine don't sound bad, i also have been running the air more this week its been hot here in florida

sounds like its coming from the front of the engine
Expert:  Eric replied 3 years ago.
Hi,

Ok, lets first eliminate the valves. you just need a long screwdriver for this.

with engine idling and making the tapping noise, place the metal end of the screwdriver against the valve covers one cover at a time. Now place your ear to the handle end of the screwdriver. Is the noise amplified? If it is, then its valve lifters causing the noise. If not, then no problem there.

If not the lifters, then the noise could be from either one of the pulleys(I have heard pulleys make a light tapping sound before), or could be a timing chain guide that is worn enough to allow the chain to tap against cover at idle. when rpms put to it, the chain tightens enough to not hit the inside of timing cover.

For these, you need a mechanic's stethoscope to listen to and find which is the cause and use extreme caution as you are working around a moving belt. I dont recommend people doing this unless they are experienced around engines as the belt will take off skin and muscle. If you feel comfortable doing this, you can get the stethoscope for about $10 at a parts store. place the long end against the timing cover to listen to for amplification of the noise and if none heard, then place by each pulley until noise amplification is heard
Customer: replied 3 years ago.
i was also reading the the wrong oil filter will cause the oil not to flow right which will cause tapping also. i believe a fram was put on but of course the manual recommed using the motorcraft oil filter and since the oil change was done 2 days ago
Expert:  Eric replied 3 years ago.
Hi,

that is correct, but I have never ran into a problem with Frams. I have with store brands such as Autozone and Advanced Auto Part's house brands, but never with a Fram in over 25 yrs.

it wouldnt hurt to run by the dealer and pick up a Motorcraft and replace the Fram filter, but unless the Fram is simply defective, I dont see this a problem.
Eric, Automotive Repair Shop Manager
Category: Mercury
Satisfied Customers: 24208
Experience: 20+ yrs. experience as repair shop manager and technician.
Eric and 2 other Mercury Specialists are ready to help you
Customer: replied 3 years ago.
ok thanks for the response

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
< Last | Next >
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
  • Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me. Molly USA
  • I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service. Jason V. Kirkland, WA
  • I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there. BR New Jersey
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    1601
    ASE Certs and Ford Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    1601
    ASE Certs and Ford Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Mercury Technician

    Satisfied Customers:

    1399
    16 years experience with Mercury
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Mercury Technician

    Satisfied Customers:

    403
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    287
    33 Years experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/scottz136/2008-12-09_220350_js640_p1010013.jpg scottz136's Avatar

    scottz136

    Mercury Technician

    Satisfied Customers:

    260
    senior master lincoln mercury tech.
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    257
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Mercury Tech -

    Satisfied Customers:

    197
    18+yrs experience. State Inspector and Mercury Diagnostics