Q: Knocking under car.

asked by on September 17, 2016

I have a very loud knock that sounds like it's coming from the driver's side wheel well of my car. The odd part is, the knock only happens when the car is rolling and the engine is not braking, turning, or under load. So the knocking doesn't happen when I accelerate, it doesn't happen when I brake, and it doesn't happen when I turn. It doesn't just get quiet, it stops completely. I've checked the u-joint, and both wheel assemblies. I'm at a loss...

My car has 200000 miles.
My car has a manual transmission.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Noise coming from torque converter
Hi there. A noisy torque convertor signifies that it will need to be replaced soon. Also the torque convertor is connected to other components in your transmission that can also be the cause of this noise. To have this correctly...
Got my oil changed this morning and now my oil light is on and the cold/hot gauge is passed the h.
Hello. It sounds like the engine was not filled all the way. A lack of engine oil or a low engine oil level will cause the oil pressure to drop and can cause the engine to overheat as well. I...
Vehicle hard starting & fuel economy issue.
Check for proper fuel pressure - both while the vehicle is running, and after running. I suspect you will find that fuel pressure is not being maintained in the pressurized portion of the system due to a fuel pressure regulator...
20 amp ignition fuse continues to blow
Hello. All of this depends on what was spliced into that circuit when the engine was swapped out. I usually isolate this problem by disconnecting the circuits in it until it no longer blows. This fuse usually has a problem...
Rear pinion seal leaking. Would i also need to change the flange?
The flange is integral with a splined yoke. The yoke segment (of the flange/yoke) has a precision, machined, highly polished surface which mates with the rubber seal (https://www.yourmechanic.com/services/pinion-seal-replacement). Since the rubber seal is spring loaded and is under tension against...
Emergency brake was pushed too hard. Cable snapped at a rusty spot.
Hello there, parking brake cables will fail over time in your 1994 Chevrolet K1500. Over time the cable stretches and can break when the parking brake is applied. The parking brake cable is a safety feature and must be replaced...
My mechanic review on my dashboard
Hi there. We've all been there and I completely understand how easily we can be frustrated in the whole process. I am forwarding your request to customer service. Feel free to reach out to customer service via phone at +1-800-701-6230....
How much does it cost to replace a CV Shaft on 2007 Dodge Grand Caravan.
Hi there. The shaking could be the CV Shaft joints seized up or the suspension on your vehicle is loose causing the vehicle to shake in both forward and reverse directions. Tires with a bubble or out of alignment tread...
1989 Toyota Land Cruiser hard right turn feels like it's losing pressure only when gas reads under 1/4 tank
Hi there. The issue seems to be that the fuel level indicator sending unit is not working properly. When your fuel gauge is reading at a 1/4 tank, it maybe at 1/8 or 1/16 of a tank causing the fuel...

Related articles

2005 Jeep Wrangler vs. 2005 Chevrolet Blazer: Which One Should I Buy?
Sport SUVs are a class all of their own; these vehicles are meant for a fun drive through the woods and across the trail – but not necessarily to Grandma’s house! Think instead about going through the creek and through...
2007 Nissan Versa vs. 2007 Saturn Ion: Which One Should I Buy?
Compact cars as a class are generally meant to be commuter vehicles: with excellent gas mileage, an entry-level price point, and decent safety ratings for those who are on the road the majority of their time. These cars also make...
Saturn Certified Pre-Owned (CPO) Car Program
Drivers Drivers who are shopping around for a used Saturn vehicle may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on to...