Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHRYSLER2004PT CRUISER TOURING, 2.4 B, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (ENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURES)PRELIMINARY INSPECTION & ADJUSTMENTSMECHANICAL INSPECTIONCYLINDER COMPRESSION PRESSURE (USING DRBIII(R))
2004 Chrysler PT Cruiser Touring, 2.4 B, Automatic
Cylinder Compression Pressure (Using DRBIII(R))
2004 Chrysler PT Cruiser Touring, 2.4 B, AutomaticSECTION Cylinder Compression Pressure (Using DRBIII(R))
WARNING: This page is about a different car, the 2002 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise the indicated compression pressures may not be valid for diagnosis purposes. Check engine oil level and add oil if necessary.
- Drive the vehicle until engine reaches normal operating temperature. Select a route free from traffic and other forms of congestion, observe all traffic laws, and accelerate through the gears several times briskly. Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnormal firing indicators fouled, hot, oily, etc.
- Record cylinder number of spark plug for future reference. Remove the Auto Shutdown (ASD) relay from the Power Distribution Center (PDC). See Figure . PDC is located in engine compartment. See Figure .
- Be sure throttle blade is fully open during the compression check. Insert Compression Gauge Adapter (8116) or equivalent into the No. 1 spark plug hole in cylinder head. Connect the 0-500 psi (Blue) Pressure Transducer (CH7059) with cable adapters to the DRBIII(R). Crank engine until maximum pressure is reached on gauge. Record this pressure as No. 1 cylinder pressure. Repeat the previous step for all remaining cylinders.
- If one or more cylinders have abnormally low compression pressures, repeat the compression test. See COMPRESSION SPECIFICATIONS table for correct engine compression pressures. If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it could indicate the existence of a problem in the cylinder in question.
- The recommended compression pressures are to be used only as a guide to diagnosing engine problems. An engine should not be disassembled to determine the cause of low compression unless some malfunction is present.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.