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Engine rough noise when slightly accelerate
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Bertg
Novice
Jul 5, 2014, 10:48 PM
Post #1 of 16
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Engine rough noise when slightly accelerate
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Hello, I have a 2005 Jeep, Grand Cherokee, Laredo with a 3.7 V6, 110k miles. My engine seems to make a rough sound when I accelerate just a little while driving at normal speeds. It does not do it at while in park, at take off, or at higher speeds. Only with slight press of gas pedal during normal motion. It does not sound like a spark plug (missing) noise. Just a roughness to the engines tone. Does not die out or stall in any way. I don't know where to start to look and can't afford the dealership. Where should I start diagnosing the problem? Any idea what could cause such symptoms?
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Tom Greenleaf
Ultimate Carjunky
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Jul 5, 2014, 11:48 PM
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Re: Engine rough noise when slightly accelerate
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Of many a common noise that has no ill operational effects is exhaust heat shields or parts to exhaust system. Engine cold even just tap on parts with a rubber hammers front to back on the parts of exhaust especially the shields along the way right to tail pipe and see if that makes it make a noise.
Some you need parts and some you can fix all depending if you in fact do find one with a somewhat common spot weld of a light shield cover that rusted out. Start there or any loose parts that could be effected by a running engine,
T
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Hammer Time
Ultimate Carjunky
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Jul 6, 2014, 1:41 AM
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Re: Engine rough noise when slightly accelerate
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Another possibility is a Catalytic Converter broken internally. You can usually find things like that by giving the exhaust system a sharp jolt with the heel of your hand at various spots.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Jul 6, 2014, 1:53 AM
Post #4 of 16
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Re: Engine rough noise when slightly accelerate
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My advice is to take it to a reputable independent repair shop and have them go for a ride with you. Four ears is better than two sometimes.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Bertg
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Jul 6, 2014, 7:48 AM
Post #5 of 16
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Re: Engine rough noise when slightly accelerate
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This may be a dumb question but regarding looking for a problem with the exhaust or catalytic converter; you guys mentioned hitting it with my hand or rubber hammer, am I looking for something loose inside when I hit the parts? And should this be done with the vehicle off? I took a mechanic for a ride with me. He told me I needed an engine computer analysis to find out if it is a possible vacuum leak or catalytic convertor. The jeep does not loose any power when I drive it while the rough noise is taking place. Firestone said they can do one during the week for $89. I'm a bit Leary since I have not had much success in the past with diagnostics. I want to try the practical approaches that you gentlemen recommend first. Thanks for helping me.
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Hammer Time
Ultimate Carjunky
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Jul 6, 2014, 8:09 AM
Post #6 of 16
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Re: Engine rough noise when slightly accelerate
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I wouldn't rely on the computer being too much help in finding a noise.
Yes, when you bang on the exhaust you are listening for something broken inside and yes it should be done wit the engine off.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bertg
Novice
Jul 13, 2014, 4:25 PM
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Re: Engine rough noise when slightly accelerate
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So far no luck. Have taken several mechanics for rides. Can't determine what could cause the engine to sound rough at slow speed with slight acceleration. If I hold the pedal in the spot where the noise occurs it will remain continuous until I release it or speed up. One person said it may be an exhaust leak. Another tells me it may be a vacuum leak, but there is no loss in power so it may be something else. Don't know what to check. The exhaust does not show anything to the naked eye. And wouldn't the exhaust be continuous?
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Tom Greenleaf
Ultimate Carjunky
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Jul 13, 2014, 8:30 PM
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Re: Engine rough noise when slightly accelerate
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? You've had this shown to several mechanics and can't find it! Did you duplicate the noise in front of them?
Check all intake air parts that they are tight and no cracks or leaks.
Try (all caution) plugging tail pipe some while it occurs if possible with something like a wet rag to see if it goes away.
Try wetting belt to see if noise changes or even use WD-40 which won't last and if either make a change chase down belt itself or items in pulley system.
If pros can't figure this out in person the web isn't going to,
T
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Bertg
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Jul 25, 2014, 4:34 PM
Post #9 of 16
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Re: Engine rough noise when slightly accelerate
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Update: ended up at the Dealership. turns out the serpentine belt was incorrectly installed causing the power steering pump to run backwards. After a while the noise must have started up for some reason from the steering pump. Seems to be Fixed now.
Thanks everyone for your efforts to help
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Tom Greenleaf
Ultimate Carjunky
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Jul 25, 2014, 5:58 PM
Post #10 of 16
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Re: Engine rough noise when slightly accelerate
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OK I think? Not sure how that could happen and work at all but it's fixed apparently but doesn't make sense about routing and PS running backwards?
I'ts done now but here's what I could find for routing. See how impossible it would be for a correct belt size to turn an item backwards and still fit????
Said quoted same routing 3.7 or 4.7 "Fig. Accessory serpentine belt routing-Jeep 3.7L and 4.7L engines"
I could understand wrong belt or not on pulley(s) properly but hard to misroute it and run.
Oh well, hope it's all set,
T
(This post was edited by Tom Greenleaf on Jul 25, 2014, 6:00 PM)
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Bertg
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Jul 26, 2014, 12:11 PM
Post #11 of 16
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Re: Engine rough noise when slightly accelerate
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It appears the noise is not completely fixed after all. I can still hear it slightly. The technician said he did not replace the belt but rather he only put it on correctly. It is not as loud as before but I can still hear it. The belt must have had some impact on it but now I don't know on what? As Tom pointed out, the power steering could not have been running backwards as the Dealership mechanic reported to me. The belt only really has one way to be installed. The place is closed for the weekend. Took it to Firestone today and they were at able to help. Told me they Could not hear it - bring it back if I hear it again. Guess I will drive it til it gets louder?
(This post was edited by Bertg on Jul 26, 2014, 12:20 PM)
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Tom Greenleaf
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Jul 26, 2014, 10:35 PM
Post #12 of 16
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Re: Engine rough noise when slightly accelerate
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Info or details on who really did what isn't dependable IMO yet. Your bill should have better but some are too brief or in acronyms or codes for what.
If messing with the belt helped when it absolutely would have done this then toss that belt for a known brand bragging it's quiet.
Take my word for it some for no visual apparent reason are noisy to the point you would think something is really wrong. Some will hiss, crackle type sounds or other. The shine on belt and pulleys with any time and use they make some noise.
You can try spraying it on the ribbed side with even water or WD-40 and test right away. It may not but if the belt itself usually should quit and return later.
NAPA belts to me so far all have been quiet. I think both Goodyear and Dayco sell belts specifically to be quiet as well. Who sells what changes so ask at a parts outlet if this is just belt noise and seems to be.
Any have to be the correct size and installed exactly on the pulleys such that all grooves match up and hard to believe no tech found that off or wrong and about don't believe things were spinning backwards. I'm really not sure 100% but doubt you would have PS if it was turning the wrong way! I never tested one or ran into that - ever!
So right now I'm blaming the belt itself. Not certain of your skills but many are NOT that hard but must have that OE diagram. If that is missing and the one I posted is in fact correct print it out.
The belt tensioner could also be erratic with holding tension. You can look up you own parts costs (you'll see wholesale prices if you buy parts yourself not the retail price shops would charge) but get a clue and see different ones available.
Again - this time if that belt on it now is older or if over 20,000 miles or so OR IF YOU HAVE NO CLUE about it then just toss it! You must have a properly working belt or vehicle will not run far - no water pump, PS, alternator but would start and run. Don't drive one that way but is done for quick (minute or so) testing not out on any road.
Again already - I'm saying toss that belt pretty much. It could look and NOT make a peep for a tech and cause you issues and only a new better, one would prove it about now. Keep old one for a while just because,
T
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Tom Greenleaf
Ultimate Carjunky
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Jul 26, 2014, 10:47 PM
Post #13 of 16
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Re: Engine rough noise when slightly accelerate
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Sorry for two posts. Here's a pic of a Goodyear belt on one of my own vehicles right now. Have not found a new one yet locally and need another myself. Liked those but Dayco was also fine as said and NAPA. The "specifically quiet" belt DO STRETCH FASTER AND GO OUT OF RANGE OF PROPER SELF ADJUSTMENT SO NEED DOING MORE OFTEN!
This is chump change as things go for having a vehicle.
Pic if it shows or jus search them out for yourself if just an "X" shows...........
Tom
(This post was edited by Tom Greenleaf on Jul 26, 2014, 10:48 PM)
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Bertg
Novice
Jul 27, 2014, 3:44 AM
Post #14 of 16
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Re: Engine rough noise when slightly accelerate
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Tom, thank you for your advice and wisdom. I will pick up a belt and get it on this week. That surely will be cheaper than what I've already spent : ).
The dealership alone charged me $200 just to turn the belt around. And that's with my Military discount.
I assume it was for the troubleshooting. I'm not sure I want to take it back there. The explanation of the Power Steering pump running in reverse does not seem logical to me now that you pointed it out.
However, looks like something was fixed after the visit. And Firestone was so busy, I felt bad for the technicians having to trouble shoot something like this. They pretty much rushed me out and told me to bring it back if I hear it again. However, this has been a good lesson for me into the world of mechanics. Will keep you posted.
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Tom Greenleaf
Ultimate Carjunky
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Jul 27, 2014, 4:32 AM
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Re: Engine rough noise when slightly accelerate
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Beating on this because I'm near sure. No such thing as sure via the web vs in person of course. Sorry for the $200 expense which is probably legit for a couple hours but I don't agree with the findings?
OK: Belt is just $28.99 (local AutoZone) made specifically for belt noise and tolerance of slight imperfections in pulleys. Note: I don't work for them at all - buy where you wish. Site is great for pictures of parts and descriptions of them.
Belt alone...........
From their bragging points on it........
Features & Benefits
Designed for high mileage multiple-accessory drives, Dayco’s “W” profile belt (patent pending) is the most innovative advancement in multi-rib belt design in over 25 years. Dayco® Poly-Rib® Belts meet or exceed SAE J1459 and SAE J2432 specifications. This Poly-Rib® Belt is another Dayco® product proudly made in the USA.- The "W" profile rib has been engineered to conform to slight misalignments, the number one cause for belt noise
- Aramid noise resistant fibers embedded in the rubber make this belt run quieter in worn or misaligned pulleys
- No-Noise Advanced Design EPDM rubber compound for quiet extended life
- Made in the USA
********************************
That was their comments and I can't be responsible for mistakes or truth of claims.
I've battles this crap and ONE fresh belt on another something just preventative made noise about 6 miles after new so bad (a family vehicle) I really thought a nasty problem lurked! NO - It was a crumby belt, fit properly, installed properly and just like a joke was made to be noisy on purpose kind of thing. It shut right up with then a NAPA belt. Elusive that time as that ONE did NOT respond to shutting up with even greasing it which is the only that ever was that bad. Noise so bad a car next to you could hear it in traffic so this isn't bullshat.
Refresh: I've dealt with some as vehicle's age some and miles. Some techs will say replace all the pulleys as they are now too shined up. If they are damaged that's another thing and you should see that.
More: This crap if it doesn't stay doing it or just pulls attitude and doesn't do it for a tech it will NOT get caught. Forgive them and me if wrong but they had the advantage of being there, I don't. They also (techs) are probably working for that shop that isn't going to let them waste too much time and until busted something shows up are blowing you off. I can't know that either.
OK: Looooong done with this stuff but still do what I can for only my own. Worked for myself so my rules how long I spent on finding screwy elusive shat like this and wasn't counting the time as it becomes a vendetta to find it and solve it for me. Make a buck wasn't the point - find it and fix it when others failed is a rush but lose your shirt for the time spent uncharged and many my own or family never asked for $$ from them.
Places can't do this but if you brought that to me now (dang getting older and tired suks) I'd still do about the same thing. Take that right to the parts store with the tools with me and install it right there for this particular one/type. If all the same I was wrong. If nailed problem gone right away. Save old belt and put by your spare tire or something for an emergency if you allowed.
More again: On the rare side but some bracket holding all the pulleys or loose bolts or even leaking antifreeze not noticed could be in the cards just missed by techs so far. If a recent accident or recent work I would look for that area for a problem.
Sorry for the total novel and can only hope I'm correct for you. This is an all volunteer site so nothing to gain on my part.
Your call as always. If you wish to do this job yourself and have some tools I/we are here and can walk you thru it. This exact one I can't see anything too difficult - others can be.
At worst and we hate to waste parts guessing but if nothing else can be found this risk of $28 bucks isn't a killer and you have a new belt!
Touche,
Tom
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Discretesignals
Ultimate Carjunky
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Jul 27, 2014, 6:17 AM
Post #16 of 16
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Re: Engine rough noise when slightly accelerate
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I'm trying to image how the belt was put on to make the power steering pump turn in reverse. I don't think you would have power steering if the pump rotation was reversed.
Dodge PS pumps are kind of funny about making noises when they get air in them. Seen Dakotas pull in air through the return side and make funny PS noises. When it is making its noise, look in the reservoir for foaming fluid.
Also, while you have the belt off, inspect the water pump pulley for play and spin the belt tensioner pulleys and listen for grinding or rough noises.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 27, 2014, 6:29 AM)
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