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Nissan Altima Loud Growling Sound

Q. Hi Vincent, I found your info while searching online for answers to a problem I'm having with my car and would really appreciate it if you could help as I haven't been able to find help anywhere else. Here's some information about the car:

  • 1993 Nissan Altima GXE
  • 2.4 liter
  • Automatic transmission
  • 102,000 miles
  • Fuel Injection
  • ABS brakes
  • P/S, A/C, Cruise control
Nissan Altima Loud Growling Sound

Last week I smelled gas when the car was started and found a leak in one of the hoses leading from the fuel tank. I had a friend look at it as I do not know anything about cars. The friend looked around and checked under the car to confirm that the major hose leading from? the tank had a crack and that it needed to be changed, but he did not have the equipment to do it. So I had a local mechanic change the hose the following day.

Now, there is no more leak but when driven and acceleration reaches 2,000 rpm there is a loud growling sound (very scary and definitely not normal) which did not exist previously. I had the mechanic check it over but he could not find the cause for this loud growl problem. Also, when the car is in park and accelerated to 2,000 rpm or above, there is no loud growl. The noise is only there when driving and accelerated to 2,000 rpm or above.

I thought it might be the cold weather and tried warming up the car for 5 minutes before driving but the problem still exists. Could it be due to some loose connection in the hoses (maybe caused when my friend was checking for the leak) or a hose being pinched somewhere? Would these situations cause a lack of enough fuel or too much air or something to get through resulting in the loud growl above 2,000 rpm?

I am thinking this loud noise problem had to do with checking and changing the hose as it has never occurred before. I've also looked online and could not find any similar problems listed. Would really appreciate it if you could help.

Thanks in advance. Looking forward to your reply.
Regards,
Mika

A. There was a TSB issued on this type of noise that, I'm pretty sure, applies to your vehicle.

Classification: EF&EC93-002
Section: Engine Fuel Emissions Control
Reference: TECHNICAL BULLETIN NTB93-043
Models: 1993 Altima (U13)
Date: March 2, 1993

EXHAUST SYSTEM RATTLE NOISE

APPLIED MODELS: 1993 Altima (U13)

APPLIED VIN:
Vehicles produced before 1N4BU31F(*)PC121534 [October 9, 1992]

SERVICE INFORMATION:
Some of the applied vehicles may exhibit a "rattle" noise during acceleration. This rattle sounds like a heat shield rattling/buzzing. The incident occurrence varies from vehicle to vehicle, but, will usually be described as occurring during the following conditions:
  • Vehicle fully cold.
  • Noise occurs between 2,000 - 2,500 rpm, during acceleration.
  • Noise may be duplicated by a "stall test."

This incident may be caused by the Pre-Muffler Assembly (the muffler located immediately down stream of the catalytic converter).

NOTE:
The Parts Department nomenclature for the Pre-Muffler Assembly is: "Muffler Assy - Exhaust, Sub".

In some Pre-Muffler Assemblies, a rattle-type noise may occur due to the resonance of its glass wool packing.

REPAIR INFORMATION:
This incident can be resolved by replacing the Pre-Muffler Assembly with Muffler Assy - Exhaust, Sub (P/N 20300-1E860).

You can do a stall test by applying the parking brake, stepping on the service brake, putting the transmission in "D" and stepping on the gas to bring the rpm up to between 2,000 and 2,500 rpm. Great care must be taken when doing this test. Do not do the test for more than 10 or 15 seconds at a time and be sure there is nothing in front of the vehicle in case you should let go of the brakes.

The Pre-Muffler Assembly was probably disturbed when the hoses were replaced and started the noise.

Additional Information provided courtesy of AllDATA

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