Edmonds Auto Repair

Your car shifts early on an easy drive, holds a gear longer on a hill, and downshifts when you ask for more acceleration. Why does the same transmission act differently from one moment to the next? A modern automatic uses sensor information and programmed control strategies to pick a suitable ratio. Vehicle speed is part of that decision, but it's far from the whole story. The transmission also considers how much power you're asking for and the conditions the vehicle is operating in. Automatic Transmission Controls Compare Several Inputs The transmission control unit receives information like engine speed, vehicle speed, accelerator position, and requested engine torque. Sensors inside the transmission can report the speed of its rotating parts. Together, those readings tell the controller what the current ratio is and what the vehicle needs next. The software compares those inputs with programmed operating strategies, then commands the components that perf ... read more

Trucks and SUVs are often asked to do things that passenger cars rarely handle. Towing trailers, carrying heavier loads, climbing grades, driving off-road, and moving through stop-and-go traffic all create extra heat inside the transmission. That does not mean every truck or SUV automatically needs an oversized cooler. The right amount of cooling depends on the transmission design, vehicle weight, towing capacity, factory cooling system, and how the vehicle is actually used. What matters most is keeping transmission fluid within a safe operating range when the drivetrain is working hard. Heavy Vehicles Put More Heat Into the Transmission A transmission creates heat whenever clutches, gears, torque converters, and hydraulic circuits are working. The harder the vehicle has to move, the more heat the transmission has to manage. Trucks and SUVs are heavier than most cars, so they start with a greater workload. Add passengers, cargo, larger tires, or a trailer, and the ... read more

Selecting Reverse while a vehicle is moving forward can create several different outcomes depending on its speed, transmission design, and electronic controls. In many modern vehicles, the transmission control system prevents Reverse from engaging until road speed drops to a safe level. The shifter may move, but the transmission remains in Neutral or continues operating in a forward gear. Older vehicles and some mechanically controlled transmissions may offer less protection. If Reverse begins engaging while the wheels are still turning forward, the transmission can experience severe internal stress. Even when no immediate failure occurs, the event may damage clutches, gears, mounts, axles, or driveline components. How Modern Automatic Transmissions Respond Most late-model automatic transmissions use electronic shift controls. Moving the selector sends a request to the transmission control module rather than directly forcing the transmission into Reverse. The module ... read more

Shocks and struts do not usually fail in a way that gets your attention all at once. They wear slowly, and that is what makes them easy to ignore. The vehicle may still start, steer, and stop, but it feels a little more bouncy than it used to. The front end dips harder during braking. The tires start wearing in a strange pattern. Those changes are not just about comfort. Shocks and struts help control the vehicle's weight as it moves. They keep the tires planted, limit bouncing, steady the body through turns, and help the brakes work with tires that are actually staying on the road. When they wear out, several parts of the vehicle start paying for it. What Shocks And Struts Actually Control Shocks and struts are part of the suspension, but they are not there just to soften bumps. Their main job is to control motion. When the vehicle hits a dip, turns into a corner, stops hard, or drives over rough pavement, the springs want to keep moving. Shocks and struts slow ... read more

Transmission trouble can make any driver nervous because the repair can sound expensive before anyone even explains the options. Maybe the car is slipping, shifting hard, taking too long to go into gear, or making a noise it didn't make before. Once the transmission is involved, the big question becomes whether it can be rebuilt or needs to be replaced. There is no single answer that fits every vehicle. A rebuild can be the better choice in some cases, while replacement makes more sense in others. The right path depends on the type of failure, the condition of the transmission, parts availability, vehicle value, and how long you plan to keep driving it. What A Transmission Rebuild Means A transmission rebuild means the existing transmission is removed, taken apart, inspected, cleaned, and repaired with new or reconditioned internal parts. Worn clutches, seals, gaskets, bearings, bands, bushings, and other damaged components can be replaced during the process. T ... read more