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Here are some potential causes and solutions for the loss of power when accelerating and going uphill in your Nissan Sylphy Bluebird:
Replace the air filter if it's clogged with dirt. This allows more air into the engine for better combustion.
The fuel pump may be failing, not providing enough fuel pressure. You'll need to test the pump pressure and replace it if necessary.
Replace the fuel filter if it's restricted, allowing full fuel flow to the engine.
Faulty spark plugs, bad ignition coil or faulty crank/cam sensors can cause misfiring and power loss. Check for error codes and inspect these components.
A clogged catalytic converter or muffler can restrict exhaust flow, impairing engine performance. Inspect the exhaust system.
Problems like worn clutches or torque converter failure can affect power delivery. Have the transmission inspected and serviced if needed.
The jerking when pressing the gas pedal could indicate an issue with the throttle body, dirty fuel injectors or transmission problems like worn mountings. I'd suggest having a mechanic inspect the engine and transmission completely to properly diagnose and resolve these driveability issues.
loss of power can be a number of things, exhaust leak around manifold. air leak on vacuum lines, fuel pressure low or pump not working 100% blocked fuel filter, weak ignition spark, timing out. can also be the fuel using. air filter blocked. all these can limit power, but if its mostly on inclines it would be more on the fuel side.
Needs piston rings. You have lost compression so you are losing power. The oil is getting pasty the worn rings and entering the combustion chamber which would explain the black smoke and loss of power.
This is a lengthy string ... but might be useful. It goes over all sorts of things ... stumped carb backfire uphill at higher RPM
But one of the guy's issue with the new 4bbl carb was that his floor mat under the accelerator pedal limited just how far open the second set of bbls could open so he had loss of power at higher speeds.
check the hose on the intercooler and around the turbo, check for split on turbo and the intercooler hose not too soft as they can collaps while driving
Loss of power on inclines means a BAD EGR. They're cheap, don't clean it, the diaphragm is BAD. Replace the EGR valve and you're good to go friend.First indication of a faulty EGR is loss of power on an incline/hill.
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