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I hope another expert has answered but I will make a few suggestions. In general you have wear in places where the valve and lifters meet the camshaft lobes. The slight machining of the valve seats in the heads can produce a few millimeters difference in where the valve stem now sits.
With hydraulic lifters there is suppose to be a range of operation which takes up any slack between parts like the valve stems. With non-hydraulic or solid lifters clearance is either adjusted with shims or with screw type adjustments. You may not even have lifters as some engines have camshafts that directly touch the valve stems.
Common practice is to keep worn parts mated to each other. You would keep valve 1 in place to ride on camshaft lobe 1. You would not want to mix say valve 3 into position of cam lobe 1. The two surfaces have different wear patterns.
Also valve spring tension is to be measured on each valve after grinding or valve replacement. Springs are either replaced or shimmed to book specs. Even motor oil can affect sound levels.
Sometimes adjustments can be made after a break-in period. It is hard to place blame without completely stripping the engine and measuring each part. You are kind of at the Mercy of the original repair facility or you may have another place listen to your motor and see if they think it is unusually noisy.
The rope snatching is an indication of a sheared flywheel key. It is over advanced (ignition timing). Pull fly wheel and use a steel replacement key. Original key was probably aluminum. The valves a adjusted cold with the valve closed, set with a slight shake present at rocker arm and valve stem.
2 possibilities: 1 - HVAC External Drain Tube stopped up with dirt, bee nest, etc. Hard to get to w/out a car lift. Need to clear and drain HVAC box. 2 - Leaking heater core inside HVAC box. Moisture from defog will smell sweet and be hard to clean off glass. Requires Dash removal and AC service to replace Heater Core. Very time consuming and Expensive A-Freeze fumes are also lethal if inhaled.
Try Solution #1 First, Least Expensive, Non-Lethal Condition.
1. inflate your tires to the correct pressure (not just visually, but use a gauge) 2. your wheels have TPMS (tire pressure monitoring system) sensor attached to the rim on the filler stem, inside the tire. if that sensor has gone bad, your dash will register as having low tire pressure. replace that TPMS (little black box in the wheel. you have to remove the tire to get to it). If you have aftermarket wheels, you need to transfer the TPMS sensor from the stock wheel to the new wheel.
Open the hood, Locate the plastic panel at the base of the windscreen on the passenger side near the wiper arm. The panel is held in place with plastic tabs. Pull the center stems of the tabs upwards. You may need to use a needle nose pliers to GENTLY pull stem upwards( about 1/4"). Remove tabs. Remove panel. Once panel is removed the filter is visible and can be easily removed and new one installed. Reinstall panel ,reinstall tabs. push center stems towards panel to secure tabs.
Hello Sandra. Your Impala was originally equipped with a sensor that goes on each wheel to read the air pressure within it. The sensors are part of the valve stem where you put the air in. Each wheel is identified by a receiver inside your car that is able to tell you if the pressure has gone too low. When you had your wheels changed the valve stems were not transferred to your new rims or they were damaged if they were. In order to repair your situation the stems will need to be replaced by the ones on your other rims or new ones. If you opt for new sensors they will need to be programmed so your onboard receiver will recognize them. If you use your originals they will need to be placed at the same position as they were before. If they get mixed up it will not be able to determine which wheel is low. I hope this answers your question. If not, leave a question in comments and I will respond.
The low tire pressure monitor (TPMS) is part of the valve stem on the rims of vehicles with TPMS. You will need to install the original valve stems from your original wheels onto your new rims and then the problem should go away. If you no longer HAVE all the original stems (spare can be included! if your TPMS monitored the spare, you have to have it and it has to be aired up!), you will have to BUY original or equivalent stems, then havet hem reprogrammed to match the car (this can be done with a TPMS tool or a factory scantool).
There are no other solutions. That or you can disable the TPMS system readout on some vehicles by removing a fuse or using a disable procedure in the owners manual or factory service manual