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#4104540 - 04/09/21 09:58 AM What is this grinding noise when accelerating?
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
Hi panther people,

I've been looking around for an answer to this question, and while there are a few similar threads on here, nothing I've read sheds any light on this issue. I recently bought a 2008 CVPI, which had 123,702 miles on it at the time of purchase. She's now got 124,050. Overall the car appears to be in very good shape, new(ish) intake manifold and valve covers, etc. Aside from some intermittent odometer issues, the one thing I can't figure out is this noise that happens with harder acceleration.

The noise sounds like a grinding type sound, but I can't figure out where it's coming from. My first thought was the belt, which had some unusual wear on the top, almost like someone installed it backwards before putting it on the right way. I replaced the belt yesterday, and before putting the new one on, I handspun everything to make sure the noise wasn't coming from there.

I noticed that there's no noise with smooth steady pressure on the accelerator. However, stepping on the accelerator with a little gusto (i.e. getting up to speed to merge onto a highway) triggers the noise. The noise stops as soon as I let off the gas. I noticed it merging onto a highway and even on the street when stepping on the gas. Not sure if it only happens in certain gears or rev range, but noticed it yesterday between first and second gear around 1,500 rpm. The noise does not happen when the car is revved while in park or neutral, which leads me to suspect this might be a transmission issue?

Going to try to get some audio/video of the sound. Until then does anyone have any thoughts on what this might be?

Much obliged.

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#4104542 - 04/09/21 10:10 AM Re: What is this grinding noise when accelerating? [Re: VP71]
2011LX Offline
Over the Hill

Registered: 08/31/13
Posts: 1396
Loc: SE WI
Check the condition of the motor and trans mounts, as well as the exhaust system.

Worn or broken mounts might be causing the exhaust to bind or make contact with something else. They are easy to check: with the hood open, brake torque the engine and see if it moves around excessively.

Rotted exhaust piping, broken hangers, etc, may do the same. A good visual inspection and shake down will reveal any problems.
_________________________
2011 Crown Victoria LX - purchased @ 37k miles
currently @ 100k miles
Dark Toreador Red Metallic exterior
Medium Light Stone interior

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#4104544 - 04/09/21 10:44 AM Re: What is this grinding noise when accelerating? [Re: 2011LX]
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
Thank you! Really appreciate the input!

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#4104586 - 04/09/21 04:04 PM Re: What is this grinding noise when accelerating? [Re: VP71]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7506
Loc: MA
Agree w/2011LX. One question: is this just an audible noise or is there any physical vibration?
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4104844 - 04/11/21 06:30 PM Re: What is this grinding noise when accelerating? [Re: RF_Overlord]
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
That's a good question. Honestly, it's hard to tell since the noise happens under acceleration. I can say for sure that there doesn't seem to be a noticeable vibration, but that's not to say that there isn't one I'm just not feeling.

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#4104868 - 04/11/21 10:55 PM Re: What is this grinding noise when accelerating? [Re: VP71]
TheShadow Offline

Over the Hill

Registered: 05/01/07
Posts: 1737
Loc: SoCal High Desert
Did you check the belt tensioner for play when you did the pulleys-spin? How about with the a/c cycling on and off?

Otherwise, an audio would be priceless...
_________________________
'95 P71, 5xx,xxx miles, Rebuilt tranny, 2.73. Lives as a cab, and will die as a cab. (Died-FrontEnder)
'96 P71, 640,xxx on original drivetrain. (Now parts car - T-bone & roll)(You should see the roof - A,B & C-pillars chopped on driver side)
New to list: '96 MGM (Nice! @ 35x,xxx), '97 CV P71, '98 CV P71, '00 CV P71, 01 P71 (2 of 'em) '03 CV P71 (Nice so far) (All Ford Zinc Yellow w/Black decals & trim) And the list is growing...........
Taxicab mechanic: I HATE DRIVERS!

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#4104908 - 04/12/21 12:07 PM Re: What is this grinding noise when accelerating? [Re: TheShadow]
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
Yes sir, I did check the belt tensioner for play and it was solid. There doesn't seem to be an issue with the a/c being on or off, the noise is present with both. I'm going to try to get some audio soon.

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#4104920 - 04/12/21 01:47 PM Re: What is this grinding noise when accelerating? [Re: VP71]
TheCableGuy Offline
Climber

Registered: 04/08/19
Posts: 999
Loc: Far Northwest AZ
I’m wondering maybe a pulley/bearing going out.. my work truck, yes different but I had a very odd groan noise when my truck would get around 2500-3500 rpms. (2013 F150). Water pump detonated about a month later. Turns out it was that.. and get this, would only do it while actually driving. I reved it multiple times to 4000 rpms while in park without being able to recreate it.

Could be a handful of things. Idler pulley, PS pulley etc etc.. just my thoughts.

I know you said it doesn’t happen in idle which I find is very odd. Could he that intermittent maybe.
_________________________
2010 P7B 150K. 11K hours. 3.27, RKE, Cruise, Ported stock plenum, JMod, ADTR sway bar, KYB rear shocks.
2011 Sierra 1500 155K, too many mods to list. (RIP 01-05-2019)
2001 Durango R/T 5.9. 230K. SOLD 5-1-19

I’m a classical textbook over-thinker.


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#4104936 - 04/12/21 04:20 PM Re: What is this grinding noise when accelerating? [Re: VP71]
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
I want to apologize in advance, this is terrible audio. There's too much ambient noise outside right now to get this better quality. That said, around 7-8 seconds into the vid, if you listen closely you can hear the noise. Again, I'm sorry for the bad quality.

https://youtu.be/8RmKIJZtfUA

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#4104958 - 04/12/21 07:44 PM Re: What is this grinding noise when accelerating? [Re: VP71]
professorP7B Offline

Member

Registered: 04/02/20
Posts: 284
Loc: Rhode Island
Right at about 8 seconds...sounds like an ABS activation....
_________________________
Teacher/Technician. First-time Ford owner. ASE-certified Advanced Level Specialist.
Current vehicles:
2011 Crown Vic P7B (SAP, former campus police vehicle)
Purchased 3/27/20 w/51K, 819 idle hrs.
The garage queen...
2011 GMC Sierra 1500 SLE
Purchased 2/23/17 w/57K
5.3L LC9 V8 4X4 Ext. Cab
The trusty steed...
2009 Buick Lucerne CX, AKA "Moby Dick"
Purchased 3/23/21 w/91k
3.9L High Value V6
The Great White Whale...

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#4105022 - 04/13/21 01:44 AM Re: What is this grinding noise when accelerating? [Re: VP71]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7506
Loc: MA
All I hear is a thump.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4105042 - 04/13/21 11:04 AM Re: What is this grinding noise when accelerating? [Re: RF_Overlord]
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
Yeah, again, I'm sorry for the bad audio. I tried to record yesterday afternoon. Where I live between 2:30 p.m. and 7:30 p.m. the amount of traffic around here is insane. Between the noise from the other cars, and not being able to accelerate to where this noise is present is hard. I'll probably have to wait for the weekend to record a better video. Thank you nonetheless for taking the time to listen. I really appreciate your's and everyone else's help with this.

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#4105280 - 04/15/21 07:37 PM Re: What is this grinding noise when accelerating? [Re: VP71]
GM_Guy Offline
Posting Addict

Registered: 12/17/00
Posts: 18511
Loc: London, Ontario Canada
Can't really tell, but heres an experiment, drive with OD locked out (including the freeway portion) and see if the noise is still present under the conditions it usually might occur.
_________________________
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#4105366 - 04/16/21 05:25 PM Re: What is this grinding noise when accelerating? [Re: VP71]
GMUE03 Offline
Rookie

Registered: 12/23/18
Posts: 66
Loc: Florida
Could be spark knock, have you tried cleaning your MAF sensor?

(Quick example of what spark knock sounds like)
https://youtu.be/6xTWHJADFe8


Edited by GMUE03 (04/16/21 05:27 PM)
_________________________
2003 Mercury Grand Marquis LS Ultimate Edition- 90K


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#4105702 - 04/20/21 12:36 PM Re: What is this grinding noise when accelerating? [Re: GM_Guy]
VP71 Offline
n00b

Registered: 03/24/21
Posts: 15
Loc: Pennsylvania
Thank you for the tip! I'll give this a try. If it is or isn't present what would that indicate?

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