Why does the transmission stay in a higher gear?
The transmission may stay engaged in a higher gear for an extended period of time when it should be downshifting. This will cause the engine to over rev, and may put additional unnecessary strain on the engine and transmission.
What causes an engine surge in a car?
Step 4 – Some vehicles are equipped with an inline fuel filter, when this filter become plugged it lowers fuel delivery creating an engine surge. Learn more Step 5 – If a vacuum line has caused a leak the engine will surge, as vacuum lines age they can become brittle and fall off the engine or accessory. Learn more
Can a car shift gears without a downshift solenoid?
Downshift solenoids are an important transmission component, and without them, the vehicle will not be able to shift gears properly, sometimes even to the point of rendering the car undriveable.
Why is my car surging at idle speed?
When an engine’s computer can “hunt” or “surge” at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system.
What causes the engine to surge at low speeds?
Idle Speed Control Issues On some models, a faulty or fouled idle speed control (ISC) motor [or idle air control (IAC) motor] may cause the engine to surge at idle or at low speeds. A common problem is carbon buildup. It prevents air to bypass the throttle plate as commanded by the car’s computer.
What causes an erratic shift in a car?
In today’s computer-controlled transmissions, an erratic shift could also be due to a bad sensor or shift solenoid. These types of problems can often be checked using a transmission or factory scan tool that can check pressures and solenoid operation when plugged into your car.. Hard shifting is a common problem with automatic transmissions.
Why does my car slip when I shift gears?
You may be having torque converter issues if your car’s transmission begins to slip, which means that the fluid is not being managed correctly. A bad torque converter can cause a similar feeling as slipping gears. If you notice slipping when you are shifting gears, it may not always require expensive maintenance.
What causes a car to have a surging problem?
This dropping/overcompensating cycle is at the heart of all surging problems. A badly clogged fuel filter will reduce fuel pressure enough that the ECM must open the fuel injectors more to maintain the same amount of flow.
What are the symptoms of a bad or failing downshift solenoid?
An illuminated Check Engine Light is another symptom of a bad or failing downshift solenoid. If the computer detects a problem with the downshift solenoid circuit or function it will set off the Check Engine Light to alert the driver of the issue.
What happens to the shift pawl in a Harley Davidson?
If this is the case, your transmission may have a broken or missing shift pawl or return spring. This shift pawl spring keeps the shifter pawl, which is attached to the external shift lever, engaged with shift drum whilst the return spring puts the shift lever back to its starting position, so the transmission is ready for the next gear change.
What causes a bad shift fork on a Harley Davidson?
Causes can include a bent shift fork, bad bearing on the transmission input or output shaft, or other worn parts. A bad/bent shift fork no longer move the gears the correct distance, which prevents complete engagement of the next gear set.
What makes a transmission whine in a Harley Davidson?
The hardened steel spring can cause damage to the transmission gears if not recovered. Transmissions can offer an whole repertoire of strange sounds from a low growling or rumbling sound to a high pitched whine. We’ll describe some common sounds that that may be associated with a transmission problem.
What causes the transmission to pop out of gear?
If the dogs or slots become worn and rounded, the dogs will bounce out of the slots when engine load or RPM varies. This will present as the transmission popping out of gear into a false neutral. Bent shift forks can also cause a transmission popping out of gear; though, it typically it results in a bike reluctant to go into gear.