Loss of power when passing a vehicle and going up hill.

ANSWER : Hi there. From the description you provided, your vehicle has problems with the transmission again. You stated it will not shift into 3rd gear again, like before the transmission was rebuilt. If the transmission is again the problem, it should be covered under warranty. It could be a faulty shift solenoid. The shift indicator not reading properly could be a faulty transmission position sensor. If this is an overall lack of performance issue, according to your last statement, then possibly you have a restriction in the exhaust system. I recommend having your vehicle’s problems inspected and diagnosed by a certified technician from YourMechanic.

ANSWER : Hi there:

Anytime a check engine light is illuminated it’s because a sensor has detected a mechanical or electrical fault that impacts the vehicle’s performance. If the mechanic you go to hasn’t completed a check engine light inspection; which means they actually download these error codes; then you should find a different mechanic who knows how to complete this basic diagnostic step. In order to effectively diagnose the source of your Nissan’s acceleration issues, you might want to have one of our mobile mechanics complete a car is slow to accelerate inspection; which will allow them to download those error codes first and determine why your Nissan is sluggish on hills.

ANSWER : Hi there. Sounds like the clutch is slipping. As the vehicle is demanding more throttle and forcing the vehicle to drive faster or push the load of the car up a steep hill, the clutch could be slipping making the vehicle seem to have a loss of power, but it really is loosing grip between the engine and transmission. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your clutch.

ANSWER : The issue you are writing in about is common enough that a specific diagnostic, namely a reduced engine power diagnostic is performed by technicians dispatched by YourMechanic. If you request that diagnostic, the responding certified mechanic will get this issue resolved for you. In your circumstance, the vehicle’s powertrain control module (PCM) has undoubtedly stored one or more diagnostic trouble codes that will identify the "general area" in which the fault lies in the engine management controls. Although the throttle control system is a common trouble area with reduced power, there are quite a few other components and systems that could come into play and, of course, there is always the possibility of multiple, or "coincident", faults. Here are some of the possibilities that YourMechanic dispatched technicians would consider:

Defective throttle position (TP) sensor
Defective oxygen sensor
Defective accelerator pedal position (APP) sensor
Loose or damaged wiring
Defective throttle body
Defective powertrain control module (PCM) (not typical; ONLY if a long, long list of other possibilities is ruled out)
Any fault/error that will affect drivability function
Any fault/error that will affect vehicle performance
A fault/error in the emissions system
A fault/error in the throttle control system
A fault/error in the transmission control system

If you request the recommended diagnostic the mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi there. If you are still unsure after testing both components, you could always make a switched jumper wire, or use a circuit tester that is capable of acting as a switch. This way, you can avoid having to buy another switch and taking a chance that it is not the problem. Or you could supply voltage directly to the motor, in a short burst, to see if the motor functions in each direction. Just be aware that you need to be careful not to injure yourself around the moving parts. If you would like to have an expert perform this procedure for you, a qualified professional from YourMechanic can come to your car’s location to diagnose the electrical system and follow through with proper repairs.

ANSWER : Hello – your clutch hydraulics are the problem here. Check the clutch hydraulics fluid level – and it may share the same reservoir as the brake master cylinder (both use brake fluid as the hydraulic medium). If fluid needs to be added, that means that probably the clutch slave cylinder is leaking – this might be visible as a clear, but bitter-smelling liquid on the ground under the engine. I recommend a clutch hydraulics inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : It sounds as if you are having further issues with your transmission. If the vehicle will only go forward and not reverse, it is possible that a shift solenoid replacement will resolve the issue. It is also possible that internal transmission damage may have occured. I would strongly recommend having your transmission inspected by a qualified professionial who is proficcient at transmission diagnosis. When your vehicle is hesitating to move forward, this sounds like the transmission is slipping. Maintaining proper fluid levels is essential to proper transmission operation. Be sure to have the transmission checked for leaks as well during this inspection.

ANSWER : Hi there. Quite often when the original motor is replaced with a newer or rebuilt one, it can have minor issues like you described for multiple reasons. First, it’s very common for mechanics and repair shops to swap motors, but use existing filters, electrical and fuel lines and sensors from the old motor. When this happens, it can create ignition or fuel related problems that can cause reduced acceleration problems. In most cases, this problem can be traced to a vacuum leak, dirty or clogged fuel injectors, a defective fuel pump or faulty or damaged catalytic converter. To correctly diagnose and repair this issue, you should have a professional mobile mechanic come to your location and complete a loss of power inspection.