Engine System Fault Analysis Cases
Comprehensive collection of engine system fault analysis cases. Get detailed diagnostic solutions for starting issues, performance problems, ignition system faults, and cooling system failures.
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Intermittent Smoke on Startup in 1993 Ford Probe 2.0
1993 Ford Probe
The owner reports that their 1993 Ford Probe 2.0 smokes heavily on startup. They replaced the valve seals with cheaper aftermarket ones from eBay but ...
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1997-2000 Subaru Impreza AWD Won't Start After Battery Issues
1997-2000 Subaru Impreza
The owner reported that the Subaru Impreza would not start after the battery was flat for a month while undergoing bodywork repairs, including replaci...
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EGR Valve Identification for 1999 Pontiac Grand Am SE
1999 Pontiac Grand Am SE
The vehicle owner has recently replaced two broken valves on their 1999 Pontiac Grand Am SE with a 2.4L engine. After reassembling the engine, they di...
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1998 Volvo S70 GLT Engine Humming Noise Diagnosis
1998 Volvo S70 GLT
The owner of a 1998 Volvo S70 GLT reports a strange humming or buzzing noise coming from the engine while idling. They have posted on a Volvo forum fo...
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Engine Valve Noise Diagnosis on 2003 Daihatsu Sirion
2003 Daihatsu Sirion
The owner of a 2003 Daihatsu Sirion is experiencing engine valve noise that diminishes after the engine warms up. The vehicle has only 47,000 miles an...
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Intermittent No-Start and Sluggish Acceleration Issues
unknown Ford unknown
The vehicle experiences intermittent no-start conditions and sluggish acceleration after prolonged highway driving. Over the past 10 months, the owner...
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1998 Audi A4 Quattro V6 Won't Start
1998 Audi A4
The owner reports that their 1998 Audi A4 Quattro V6 (2.8L automatic) does not start after being stored for 12 years. When the key is turned, nothing ...
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1998 Saturn Engine Compatibility with 1999 Model
1999 Saturn SL1
The owner has a 1999 Saturn SL1 with a locked-up 1.9L dual overhead cam engine that needs replacement. They have a complete 1998 Saturn SL1 available ...
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Chevy S-10 Knocking After Intake Gasket Replacement
1994-2004 Chevrolet S-10
The owner changed the intake gaskets on their Chevy S-10, but now experiences a loud knocking noise from the engine. They encountered issues with the ...
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Brake Pedal Hard to Push and Engine Noise
1994-2004 Chevrolet S10
The owner reported that while driving their Chevy S10, they encountered a hard brake pedal that wouldn't depress when attempting to make a right turn....
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2000 Infiniti i30t Won't Turn Off After Starting
2000 Infiniti i30t
The owner reports that their 2000 Infiniti i30t starts and runs normally, but when they attempt to turn off the vehicle, everything inside shuts down ...
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Rattling Valves and Knocking Noise on Acceleration
1995 Cadillac Sedan DeVille
The owner of a 1995 Cadillac Sedan DeVille with a 4.9-liter engine and approximately 100,550 miles reports that the valves rattle during acceleration....
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Engine Misfire and Shaking Diagnosis for 2004 Chevy Cavalier
2004 Chevrolet Cavalier
The owner reports that their 2004 Chevy Cavalier makes a funny sound and shakes upon starting, as if it wants to stall but doesn’t. After having the s...
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2001 Pontiac Grand Prix 3.8L Blue Smoke on Deceleration
2001 Pontiac Grand Prix
The owner of a 2001 Pontiac Grand Prix GT with a 3.8L engine and 194,000 miles reports occasional dense blue smoke during deceleration, lasting one to...
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Black Smoke from Exhaust in 1995 Toyota Corolla
1995 Toyota Corolla
The owner of a 1995 Toyota Corolla with a 1.6L engine reports black smoke coming from the exhaust. Despite replacing numerous components including the...
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Saturn SL1 EGR Valve and Vacuum Leak Diagnostics
1994 Saturn SL1
The vehicle owner reports an intermittent check engine light that activates occasionally. Upon diagnostic checks, the vehicle was found to have troubl...
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Persistent Coolant Leak Diagnosis for 2000 Alero
2000 Oldsmobile Alero
The owner of a 2000 Oldsmobile Alero with a 2.4L engine reports a recurring coolant leak that becomes apparent after driving and parking the vehicle. ...
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2003 Ford Focus Won't Start - Fuel Issue Diagnosis
2003 Ford Focus
The owner of a 2003 Ford Focus reports that the vehicle will not start despite turning over fine. Previous repairs include replaced spark plugs and ca...
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