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What did you do to the engine if sprayed sea foam into air intake of a 1989 XJ6 project car and now there is squealing coming from it cuts off at idle speed?

Spraying Sea Foam directly into the air intake might cause several problems. Here's what likely happened and what you should do:

Potential Issues:

1. Oil Contamination: Sea Foam is an oil-based cleaner and can contaminate sensors and components, such as the oxygen sensor and catalytic converter. This can cause engine issues and affect air-fuel mixture and emission controls.

2. Engine Knock: Sea Foam can break down carbon deposits and release particles into the engine, leading to engine knocking or abnormal noises.

3. Vacuum Leak: If Sea Foam is sprayed excessively or used incorrectly, it can cause hoses or seals to become dislodged, leading to vacuum leaks.

4. Ignition Problems: Sea Foam, if it enters the combustion chambers in large quantities, can affect spark plug ignition and lead to misfires.

5. Clogged Fuel Injectors: In rare cases, excessive Sea Foam usage can cause fuel injectors to clog or malfunction.

Immediate Steps:

1. Inspect and Clean: Examine the engine compartment for loose or disconnected components, damaged hoses, and check for oil spills or residues. Clean the air intake system and throttle body to remove any traces of Sea Foam.

2. Spark Plugs and Wires: Check and replace the spark plugs if necessary. Make sure the spark plug wires are tightly connected.

3. Fuel Injectors: If you suspect clogged fuel injectors, consider removing and cleaning them professionally or using a fuel system cleaner.

4. Oil Change: Perform an oil change to remove any contamination caused by Sea Foam. Use the correct oil type and filter.

5. Sensors and Components: If you suspect sensor issues, such as the oxygen sensor, consult with a mechanic for proper diagnostics and potential replacements.

6. Professional Assistance: If the squealing persists or if the engine behavior is concerning, it's advisable to consult a qualified mechanic who can diagnose and address the issue accurately.

Preventative Measures:

1. Proper Use: Always read and follow the manufacturer's instructions for Sea Foam application and adhere to recommended quantities and methods.

2. Avoid Overuse: Excessive usage of Sea Foam can cause more problems than it solves. Use it sparingly as a maintenance product.

3. Consult Experts: If you're unsure about using Sea Foam or any other additives, consult with a mechanic before attempting any treatments on your own.

4. Regular Maintenance: Proper engine maintenance, including oil changes at recommended intervals and using quality fuel and additives, can help prevent issues and prolong the life of your engine.