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Old 01-06-2018, 10:34 AM
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Psycho1122 Psycho1122 is offline
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This is from Page 5519/8410 of the OEM Service manual for our trucks...

CYLINDER COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.
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.
1. Check engine oil level and add oil if necessary.
2. 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.
3. Remove the Auto Shut Down (ASD) relay from the Power Distribution Center (PDC).
4. Disconnect ignition cables from spark plugs.
5. 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.
6. Be sure throttle blade is fully open during the compression check.
7. Insert compression gauge adaptor Special Tool 8116 or the equivalent, into the No. 1 spark plug hole in cylinder
head. Connect the 0-500 psi (Blue) pressure transducer (Special Tool CH7059) with cable adaptors to the scan
tool. For Special Tool identification, (Refer to 9 - ENGINE - SPECIAL TOOLS).
8. Crank engine until maximum pressure is reached on gauge. Record this pressure as No. 1 cylinder pressure.
9. Repeat the previous step for all remaining cylinders.
10. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to
cylinder.
11. If one or more cylinders have abnormally low compression pressures, repeat the compression test.
12. 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.

So, it looks like your fine especially if it was performed cold.

Cheers
__________________
2005 Black RC Born on April, 22nd., 16th hour of 2005: BBK, JTSVP Gen II Shifter, JTSVP Under Drive Pulley, K&N Drop-In, Demon Coils, B&B Manifold Back Exhaust w/ Hi flow Cats, SCT Tuned by Torrie, RX Monster Catch Can, JMB QA1 "kicker" shock, Polyurethane Suspension / Sway bar Bushings, AEM Wideband, Raptor Shift Light, Dynamat Interior, JTSVP Oil Cooler lines, 70/30 DiH2O/Dexcool Mix w/ Water Wetter, ALL fluids Synthetic and a few "sneaky" aero mods

2000 ZX1270R, 200 H.P. / 111 Ft. Lbs.
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