Howling sound

Tiny
TXMEDIC
  • MEMBER
  • 2001 TOYOTA CAMRY
My car makes a loud howling sound when the RPM's get to around 1100, but only when the engine is warm. After the engine has warmed up, it will howl in park or going down the road. The check engine light is on and is giving the following codes: P0440, P0441, P0442 and P0446. All the codes say the problem is in the EVAP (Evaporative Emission System). One of the codes said the cause could be a defective gas cap, so I changed it with no luck. Any help would be great. Thanks.
Friday, May 8th, 2009 AT 11:41 AM

10 Replies

Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
Please post your Vehicle Identification Number (VIN) for proper diagnostic from the TSB.

this guide can help

https://www.2carpros.com/articles/car-howling-noise

Was this
answer
helpful?
Yes
No
Sunday, May 10th, 2009 AT 1:06 AM
Tiny
TXMEDIC
  • MEMBER
  • 6 POSTS
4T1BG22K91U863593
Was this
answer
helpful?
Yes
No
Sunday, May 10th, 2009 AT 11:31 AM
Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
MIL ON DTC P0440, P0441 OR P0446

Reference Number(s): EG013-03, Â Date of Issue: Â September 29, 2003
TOYOTA:2000 - 03 Avalon, Camry & Solara; 2001 - 03 Sienna
SECTION:Engine Related Ref Number(s): EG013-03

Under certain driving conditions, some 2000 - 2003 model year Avalon, Camry (NAP only) and Solara vehicles, and some 2001 - 2003 model year Sienna vehicles may exhibit a M.I.L. "ON" with DTC(s) P0440, P0441 and/or P0446 stored due to an inoperative Canister Closed Valve Vacuum Switching Valve (CCV VSV).


https://www.2carpros.com/forum/automotive_pictures/55316_camryclosedcanistervalve_1.jpg



Applicable Warranty
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date. For California, Massachusetts, Maine and Vermont, the Toyota Federal Emissions Warranty is in effect for 36 months or 50,000 miles, whichever occurs first, from the vehicle's in-service date.

***I will email to the entire TSB***
The warranty has expired, but you may wish to call on your local dealership. They may perform the work under good faith.
Was this
answer
helpful?
Yes
No
Sunday, May 10th, 2009 AT 12:55 PM
Tiny
TXMEDIC
  • MEMBER
  • 6 POSTS
OK, I know its been awhile, but the problem has not gone away. I changed the CCV VSV (part#90910-12199) located on the air box as the service bulletin recommended. The codes stayed off for about 60 miles, then p0441 and p0446 reappeared.

Any help would be great!
Was this
answer
helpful?
Yes
No
-2
Tuesday, December 1st, 2009 AT 7:48 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Both codes indicate faulty Evap Pressure switching valveVSV located near tank at charcoal canister see diagram


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_260.jpg


https://www.2carpros.com/forum/automotive_pictures/198357_Grafic_3_76.jpg


Did "howling stop"?
Was this
answer
helpful?
Yes
No
+2
Friday, December 4th, 2009 AT 4:15 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The code you don't want to see is a P0442. This indicates the system has detected a SMALL leak, but small leaks can often be a BIG problem to find. By small, we mean a leak no larger than a pin prick! Such small leaks are virtually impossible to find visually, so a special tester called a smoke machine is usually necessary to reveal the leak. The smoke machine feeds a mineral-oil based vapor into the EVAP system under light pressure (no more than a few pounds per square inch). The smoke may also contain an ultraviolet dye to make it easier to see under UV light.

Fixing EVAP codes can be a challenge, even for professional technicians. And if you have a P0442 small leak code, you'll probably have to take your car to a repair shop that has a smoke machine.

Incorrect purge flow and vent control circuit-Check for a faulty purge control flow solenoid or a venting solenoid, and also check for inop. VSV between engine and canister


https://www.2carpros.com/forum/automotive_pictures/12900_evap_2.jpg

Was this
answer
helpful?
Yes
No
+1
Friday, December 4th, 2009 AT 4:21 PM
Tiny
TXMEDIC
  • MEMBER
  • 6 POSTS
No the howling did not stop. Can you please send me a larger image of the diagram that you posted? Its hard for me to see it because its so small. Originally I did have a P0442 code but it cleared when I replaced the canister closed valve near the air box.
Was this
answer
helpful?
Yes
No
Sunday, December 6th, 2009 AT 11:47 AM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
We are sorry the information we provided was not useful to you. We have refunded your donation per your request. I hope we can help you next time.
Was this
answer
helpful?
Yes
No
Monday, December 14th, 2009 AT 1:40 PM
Tiny
71ELKY4FUN
  • MEMBER
  • 2 POSTS
  • 1996 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 126,000 MILES
I recently purchased this car from a good neighbor that took good care of the car. After the car warms up there is a high picthed howling noise that I notice when I drive it. The howling noise is very evident at idle and low speeds. As I accerate is will go away until I let off the gas. When I am on the freeway it seems to go away. I have combed over the engine bay, but I can't find anything making the noise (belts pulleys, etc). It only seems to be in the front interior of the car. Any ideas?
Was this
answer
helpful?
Yes
No
Friday, March 27th, 2020 AT 12:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi 71elky4fun,

It could be some vacumn valve leaking, most likely vacumn related as it disappears at higher rpm. Brake booster, PCV or air cleaner hhoses.
Was this
answer
helpful?
Yes
No
Friday, March 27th, 2020 AT 12:39 PM (Merged)

Please login or register to post a reply.

Related Noise Howl Content

Howling
GUIDE
Howling
A howling noise can be related to minor and major problems. As with all car related noises, detecting the origin of the noise can be difficult. A backseat passenger can...
VIEW MORE