Car making roaring noise

Tiny
HDAGELIC
  • MEMBER
  • FORD
Make: Ford
model: Fiesta MK4
year: 1998
mileage: 70 000
engine: 1300 cc

My Ford Fiesta began making the roaring noise apparently not caused by anything. The noise resembles the sound of the airplane propeller and it is proportional to the speed - at 25kmh (15mph) it begins as the low frequency sound barely heard and at 60kmh (37mph) it's louder then the engine revving; Its not ugly grinding and irregular but exactly proportional to the speed.

***

It seems that noise appeared on a 10 minute trip on a rainy day:

- I was driving 5 minutes - everything normal
- I pulled over and the engine overrevved (another problem) and I tried to calm it by depressing the clutch a little (not violently)
- as soon as I begin to drive back the noise appeared and I mistaken it for the engine sound (slipping clutch).

Its louder when sitting in the back seat.
Its not the radiator fan.

***

Another unusual things prior to the problem appearing (but after that everything was normal for 3 days):

- forgot to turn of the engine when parking and took the foot of the clutch
- scraped the gear a little once (didn't press the clutch enough)
- sprayed WD40 all over the engine and behind the wheels (in the steering mechanism joints and the suspenders)



*****************************************
*
* This noise is heard even when gliding with the
* CLUTCH DOWN, GEAR IN NEUTRAL and
* ENGINE OFF.
*
*****************************************



Thank you,

Hrvoje
:)
Do you
have the same problem?
Yes
No
Sunday, September 9th, 2007 AT 6:08 AM

7 Replies

Tiny
MERLIN2021
  • EXPERT
Roaring under the hood or car is usually the exhuast! Go to a muffler shop!
Was this
answer
helpful?
Yes
No
Sunday, September 9th, 2007 AT 6:51 AM
Tiny
HDAGELIC
  • MEMBER
No, its also heard when gliding with clutch down and ENGINE OFF.

And its not that kind a sound; it something between the airplane propeller and the engine sound (people riding with me think I am revving the engine too much).

I think that that could be somewhere in the transmition but the funny thinngs are:

- It couldn't be the wheel ball bearing (i think) because I heard what that sounds like - its much louder and irregular depending on the road surface, turns etc. This is a continuous noise without changes

- I don't see how could it be the gear box because it's heard in neutral or clutch down.

- A damaged or unlubricated Differential maybe? But I don't see what might have caused that. And the oil in the differential was changed recently.
Was this
answer
helpful?
Yes
No
Sunday, September 9th, 2007 AT 6:57 AM
Tiny
MERLIN2021
  • EXPERT
Then you might want to jack up the front of the car and check for any play in the wheels, could be a bad bearing!
Was this
answer
helpful?
Yes
No
Sunday, September 9th, 2007 AT 7:22 AM
Tiny
HDAGELIC
  • MEMBER
Could be, but the sound is too regular and doesn't change a bit when steering or on bumpy road - it only changes with speed (gets louder and "faster"). Could it be the differential (damaged or unlubricated)? Do the gears inside it rotate when the gear is in neutral or clutch down?

It also appeared suddenly (after driving for five minutes and stopping), so I don't think that it's any kind of wear.
Was this
answer
helpful?
Yes
No
-1
Sunday, September 9th, 2007 AT 7:35 AM
Tiny
MERLIN2021
  • EXPERT
As long as the wheels are spinning, yes! Pull the plug, the fluid level should be level with the bottom of the plug hole.
Was this
answer
helpful?
Yes
No
Sunday, September 9th, 2007 AT 7:56 AM
Tiny
MERLIN2021
  • EXPERT
SECTION 307-01: Automatic Transaxle/Transmission 1998 Escort/Tracer Workshop Manual
DESCRIPTION AND OPERATION Procedure revision date: 03/05/1998

Disassembled Views Differential Components
Differential, Exploded View

Item Part Number Description
1 7A108 Torque Converter Stator Support
2 7F401 Converter Impeller Hub Seal
3 1777 Differential Seal
4 Differential Bearings
5 4026 Differential
6 Shim
7 1177 Differential Seal
8 Bearing Housing
9 7F475 Idler Gear
10 Output Gear Bearings
11 7060 Output Gear

This is 98 Escort Tracer, but should be similar to yours...


http://www.2carpros.com/forum/automotive_pictures/62217_SWFusenfileGD0455B_gifgenref_copy_1.jpg

Was this
answer
helpful?
Yes
No
Sunday, September 9th, 2007 AT 8:02 AM
Tiny
HDAGELIC
  • MEMBER
Nice :) Thank you for that.

If somebody had (heard) the same problem I'd be glad if he commented.
Was this
answer
helpful?
Yes
No
Sunday, September 9th, 2007 AT 9:29 AM

Please login or register to post a reply.

Recommended Guides