What people keep running into with mechanics
Complaints tagged mechanics, each raised by more than one person. One-off posts are not included.
91 recurring problems · 1627 people · 23 forums we read
Raised more than once
Most people first.
- 6Is wrong brake grease bad or should I clean it off?Using the wrong lubricant on brake pads can cause rubber boot deterioration and trapped contaminants. It leaves you wondering whether you need to disassemble the brakes again to clean it off before it causes premature part failure.
- 5Knocking noise under car after bottoming out on drivewayImpact to the underside of a vehicle can bend or loosen protective shields, exhaust hangers, or suspension components like the CV axle and control arms. This creates persistent rattling over bumps and when braking, even if the car otherwise drives normally.
- 5How to get a brake booster out of a cramped engine baySurrounding components and rigid lines block the path, making it impossible to physically lift the booster out even after unbolting it from the firewall. Novices worry about damaging inflexible lines or safely removing the parts in the way, trapping them halfway through the job.
- 5How to get a stuck ball joint outStandard separator tools and hammer blows often fail because rust and high-pressure taper friction lock the ball joint stud inside the knuckle. This stops the suspension repair mid-job and prevents you from separating the joint without damaging the surrounding components.
- 5What do scratches and marks on engine cylinder walls mean?Visible markings or potential scoring seen on cylinder walls through a borescope often create uncertainty about whether the engine has sustained serious damage or cylinder wash from a no-start issue. This leaves owners unsure if the marks are critical or safe to leave alone, or what cleaning steps might be necessary.
- 5How to find a replacement engine bolt without measuring another oneDropping and losing an engine bolt during a repair leaves you stranded when local or official parts sites do not sell single replacement bolts individually. This stops you from finishing the repair without having to remove a matching bolt from the engine to measure it first.
- 5How to torque bolts without a torque wrenchSpecialized torque wrenches are often too expensive or physically unable to fit into tight engine spaces. This leaves people forced to guess tightness by feel, leading to the anxiety of either stripping bolts from over-tightening or risking leaks from under-tightening.
- 5Can't find torque spec onlineBasic maintenance details like torque specs for oil drain plugs or intake screws are frequently missing from online searches, leaving people with no information on how tightly to reinstall parts. Without these numbers, people are forced to guess or struggle to finish routine maintenance.
- 5Why does my car make a clunking noise under load or when turning?A clunking noise and binding sensation during turns, acceleration, or shifting between drive and reverse usually point to worn-out suspension components like bushings or ball joints. This sudden clunk prevents a smooth transition of power from a dead stop and creates an unsettling experience while driving.
- 5How to tell if a brake fluid leak is a cut line or wearA sudden brake fluid leak near the caliper can make the brake pedal go all the way down with barely any braking effect. Finding the exact source of the leak alone is difficult, making it hard to determine whether the failure came from normal wear or intentional damage.
- 4Can you use RTV silicone to patch a hole in a timing belt cover?Using RTV silicone can temporarily cover a small hole in an engine cover to keep out dirt and rocks, provided it can withstand the engine's heat. However, on a brand-new motor with low mileage, applying a quick patch carries the risk of material melting or failing, which leaves the critical belt vulnerable to damaging debris.
- 4Is that acceleration noise a wheel bearing or transmission failure?Unfamiliar noises during acceleration make it difficult to tell a minor fix like a wheel bearing apart from an expensive drivetrain failure. This uncertainty leaves buyers second-guessing whether a high-mileage used car is a good deal or an expensive risk.
- 4Is my auto repair quote fair?Mechanics often use confusing technical terms or quote expensive full replacements for minor damage. This makes it difficult to figure out if a cheaper fix exists, if high diagnostic fees are justified, or if the vehicle will actually get worse if you choose not to fix it.
- 3How to tell which wheel speed sensor is bad?Code readers often flag a sensor error without specifying which wheel is failing, leaving owners to check the wiring or resort to replacing parts one at a time. This lack of location data leaves dashboard lights on and disables AWD until the exact faulty sensor is found.
- 3Can I bypass a leaking factory transmission cooler with a universal cooler?When a factory transmission cooler built into the condenser starts leaking, you can bypass it by installing an external universal transmission oil cooler to avoid replacing the entire AC unit. This allows you to restore cooling functionality without messing with the air conditioning system, provided you choose the right size for your vehicle.
- 3How to reach a hidden screw blocked by other car partsWhen replacing components like a power steering o-ring, essential mounting screws are often blocked by surrounding assemblies or tight spaces. This leaves DIYers unable to reach the fastener without removing extra parts they aren't comfortable dismantling, forcing them to abandon simple repairs to avoid breaking something else.
- 3How to tell if a mechanic actually replaced a partAuto repair shops sometimes charge for parts they never installed or fake fake problems to upsell unnecessary work. This leaves drivers paying for labor and components they did not receive and makes it impossible to trust whether routine service was actually done.
- 3Should I fix my old car or cut my losses?A massive repair bill on a ten-year-old car forces you to weigh using cheaper used parts against walking away entirely. The decision stalls when you do not have the money right now and the mechanic refuses to separate the repairs to make it more affordable. This leaves you stuck, unable to tell if the quote is reasonable or if you should take the vehicle elsewhere.
- 2Two-post lift won't go down with car on itEven after removing the covers and manually pulling the safety locks, a gravity-drop lift can refuse to lower. This leaves owners panicked and unsure how to safely retrieve their trapped vehicle without causing damage.
- 2Why is my city gas mileage so terribly low?Many vehicles suffer from severely reduced city fuel economy—dropping to around 10 to 18 miles per gallon—even without warning lights or issues like dragging brakes. Standard maintenance tasks such as changing spark plugs, replacing air filters, cleaning the MAF sensor, or getting new tires often fail to fix the problem. This leaves drivers dealing with sluggish acceleration and short full-tank ranges that make city driving frustratingly expensive.
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Topics that keep appearing on the same problems — not topics with similar names.