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 GMC Expert Your Own Question

GMC Expert
GMC Expert, ASE Certified Technician
Category: GM
Satisfied Customers: 10370
Experience:  30 yrs experience, ase certified, shop owner
Type Your GM Question Here...
GMC Expert is online now
A new question is answered every 9 seconds

2001 Alero: GLS..V6, Squealing noise..losing power..Vacuum leaks

Customer Question

2001 Alero GLS, V6, Squealing noise during acceleration and losing power at higher RPM. Checked for Vacuum leaks and replaced MAF and MAP. Problem still there.
Submitted: 4 years ago.
Category: GM
Expert:  GMC Expert replied 4 years ago.
This is very commonly a faulty idler pulley or tension pulley , remove the serpentine belt and tell me if the noise goes away
Customer: replied 4 years ago.
Already did that and still have the same noise
Expert:  GMC Expert replied 4 years ago.

Okay any other too common areas for this to come from is either the intake manifold Being a vacuum Leak . All often the PCv valve may be faulty causing this problem , and sometimes the front transmission seal will squeal and making noise

Start the engine so that makes the noise and remove the oil filler cap tell me if the noise goes away

Customer: replied 4 years ago.
Did what you said and it didn't go away. It sound like its between the MAP and EGR area.
Expert:  GMC Expert replied 4 years ago.

Yes this is most likely going to be either like I said a faulty PC the valve or a leaky intake manifold gasket . If you had a smoke machine would be able to track it down a little better .

If you spray the area where the noise is with carburetor cleaner does the engine speed or idle quality change at all ?

Customer: replied 4 years ago.
What do you mean about quality change? the sound gets louder? Can I use electrical cleaner to spray... I don't have carburetor cleaner.
Expert:  GMC Expert replied 4 years ago.
It would be safer to use carburetor cleaner, what I mean by quality is does the idle get rough or smooth out or faster or slower
Customer: replied 4 years ago.
ok, i'll run down to walmart and get carburetor cleaner. There is one time I sprayed soapy water in around the Exhaust Flange Gasket (In that area) and the noise got louder and I didn't have to use the throttle to hear the noise. While sitting idle the car runs good. I'm going to get the carburetor cleaner... will be back.Felpro/Exhaust Flange Gasket nge Gasket Exhaust Flange Gasket
Expert:  GMC Expert replied 4 years ago.
ok thanks
Customer: replied 4 years ago.
got the carburetor cleaner and sprayed in the area of the noise and no changes.
Expert:  GMC Expert replied 4 years ago.

get a 3 foot piece of hose , place it near your ear and use it like a stethescope , slide it down under and try to pinpoint the origin of the noise

Customer: replied 4 years ago.
tried the hose, couldn't pinpoint the noise. But it sound like it's below the coil and MAP. There is a hose going into the exhuast manifold (below the coil) coming from the air intake. It pops out really easy. What is that hose for?
Expert:  GMC Expert replied 4 years ago.

If you could take a picture of it and send it, that would help tremendously

Customer: replied 4 years ago.
o.k. I will but its dark now..... I'll change the reply thing to give us more time. You will receive the picture tomorrow morning early.
Expert:  GMC Expert replied 4 years ago.
OK thanks
Customer: replied 4 years ago.
k
Expert:  GMC Expert replied 4 years ago.
I should be here whenever you would like to send the picture thank you
Customer: replied 4 years ago.
graphic
Expert:  GMC Expert replied 4 years ago.
That is just simply a crank case vent tube , this two should not be hooked to the exhaust manifold as you said earlier, there is a pcv valve located in this area that you're describing which is very commonly will make the noise or describing. Get a new pcv valve and grommet from the dealer not from the local parts store. For some reason the valves I've gotten local lee from the parts stores have also made noise because the listing is not proper and the catalogs
GMC Expert, ASE Certified Technician
Category: GM
Satisfied Customers: 10370
Experience: 30 yrs experience, ase certified, shop owner
GMC Expert and 3 other GM Specialists are ready to help you
Customer: replied 4 years ago.
graphic
Customer: replied 4 years ago.
I will get the PCV valve and grommet. If it isn't the problem, I will replace the gasket air intake manifold.
Customer: replied 4 years ago.
What about fuel injectors will that cause the problem with the noise and lack of power in higher rpms
Expert:  GMC Expert replied 4 years ago.
The injectors could be causing a lack of power, but be very honest with you we need to solve a vacuum leak / noise first because that could be your lack of power also

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:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • 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
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Gary

    GMC Technician

    Satisfied Customers:

    903
    15 years gm master tech/15 years ASE master tech
< Last | Next >
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    GMC Technician

    Satisfied Customers:

    903
    15 years gm master tech/15 years ASE master tech
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    476
    ASE Master Automobile Technician with over 20 years exp.
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg car tech's Avatar

    car tech

    ASE Certified Technician

    Satisfied Customers:

    448
    25 year master tech and shop owner
  • http://ww2.justanswer.com/uploads/2P/2paulm/2012-4-4_183431_justabswer.64x64.jpg Paul M ASE Master's Avatar

    Paul M ASE Master

    ASE Master Tech

    Satisfied Customers:

    187
    ASE Master Tech 20+ Years
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    GMC Technician

    Satisfied Customers:

    89
    16 years of experience
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    GMC Technician

    Satisfied Customers:

    360
    ASE Master Technician advanced level specialist
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    GMC Technician

    Satisfied Customers:

    2262
    ASE Master Certification. GM World Class Certification