Q: Car Knocking at 1600- 2100 RPM loaded condition

Hi there. These issues that you are having would not be related to a tune up or oil change, though they should be done if they are over due. Since the check engine light is on you need to start...

There is a Recall for a possibly related electrical issue with your vehicle. The Recall issue (NHTSA recall campaign 06v263000) addresses an electrical issue that has damaged various electrical systems with your model vehicle. Discuss this with your Cadillac dealer....

Hello. From the symptoms you are describing it would appear that the vehicle may be experiencing some sort of mechanical issue with the engine or transmission. The issues may or may not be related, however that should not be an...

Hi there, thanks for writing in. There is a technical bulletin (https://www.yourmechanic.com/article/how-to-use-a-technical-service-bulletin-tsb-to-diagnose-and-repair-a-car-by-valerie-johnston) that covers a leaking intake manifold in front of and below the throttle body of the manifold. The car could have a deformed intake manifold that would need...

Hello. The Check Engine Light will come on any time that the computer sees a problem with the powertrain in the vehicle. In order to know where the issue is coming from I would need to scan the computer for...

There are a couple issues but the usual deal killer is the incompatibility of the engine computers. Your existing engine computer is mapped to run a particular engine and unless every sensor output from the existing engine has identical scaling,...

If you are having to periodically add antifreeze to the cooling system, there could be either an internal or external leak. That would include a "leak" through a faulty radiator pressure cap, which fault in the cap, if the fault...

Hello, thank you for writing in. Something is causing the cooling system to overheat, and the pressure then builds up in the reservoir tank. A failing thermostat would absolutely cause the system to overheat and build pressure. If you are...

It sounds like you may have an issue with the transmission. A torque converter going bad makes the most noise when the engine is running and the transmission is in gear with the vehicle sitting still. If you move the...