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I have a 2000 Subaru Forester with a 5 speed and I’m getting…

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Hello. I have a 2000...
Hello. I have a 2000 Subaru Forester with a 5 speed and I’m getting a nasty clunk when I accelerate that occurs ever 3 to 5 seconds during steady acceleration. When I turn a corner,it seems to get worse. I thought maybe it was the viscous coupler but that doesn’t explain why it makes the noise while I’m accelerating on a straight,flat road. The more load I put on it,the more frequent it becomes but it stops as soon as I decelerate. It seems to be much louder at low RPMs. Thoughts? Thank you in advance.
Submitted: 7 months ago.Category: Subaru
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Customer reply replied 7 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 7 months ago
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Answered in 23 minutes by:
11/17/2017
Subaru Mechanic: tamaz, Subaru master technician replied 7 months ago
tamaz
tamaz, Subaru master technician
Category: Subaru
Satisfied Customers: 1,377
Experience: Subaru certified,ASE Master technician,25 years experience
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Hi,thanks for your question.This sounds like a bad axle ,have you had any work done recently?

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Customer reply replied 7 months ago
I just recently purchased the car but I have $3800 in receipts for a new engine,radiator,etc but no drivetrain work. The drivetrain has 220,000 miles on it so it very well could be. I brought it to a tranny shop and he couldn’t get it to clunk/lunge on the lift but he test drove it and heard the problem. Would the axle only clunk under load?
Customer reply replied 7 months ago
Does a faulty viscous coupler ever clunk on straight roads or is it only corners? It gets more frequent and much louder when I’m turning corners and accelerating.
Subaru Mechanic: tamaz, Subaru master technician replied 7 months ago

Yes indeed,when a load is applied the joint may have excessive play causing the clunk,the axle is accepting the load before the transfer to the wheels.The viscous could do this on straight roads depending on the internals and how long this has been happening,Viscous problems usually occur after driving 10-20 miles though

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Customer reply replied 7 months ago
Ok. The only thing I’d that I’ve heard a CV axle going bad and it sounds nothing like what I’m hearing. Mine is a clunk that’s heavy and loud when I accelerate quickly with a soft lunge.
Subaru Mechanic: tamaz, Subaru master technician replied 7 months ago

Noises are tough to diagnose over the internet,if this noise didn't occur on the lift it could be because there is no load (or very minimal) while on lift.I have had bad axles causing some very heavy loud noises but without experiencing it I can't be sure,have all the mounts on engine and trsns been checked?

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Customer reply replied 7 months ago
Is there a way to check a CV to see if it’s gone bad? I got under it and shook them both to check for play but they seemed normal.
Customer reply replied 7 months ago
Yeah,I understand. It’s a tricky diagnosis via internet. You’ve given me another possible remedy though so I appreciate it. I’ll check it out.
Subaru Mechanic: tamaz, Subaru master technician replied 7 months ago

Just by checking for play up/down and side to side better to check when up in the air

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Customer reply replied 7 months ago
I’m assuming that the mounts were checked/replaced when the engine was replaced but I can’t be sure.
Customer reply replied 7 months ago
Great. Thanks.
Subaru Mechanic: tamaz, Subaru master technician replied 7 months ago

Thats something under a load that can cause loud heavy clunking driving straight or cornering

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