Compression Test Results...?
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Joined: Apr 2009
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From: Florence, AL
Compression Test Results...?
Sooo fouled my plugs.. cars still running rich..
Decided to check compression while i had the plugs out.
Results were from front of car to back:
190
175
150
150
Look ok?
-Michael
Decided to check compression while i had the plugs out.
Results were from front of car to back:
190
175
150
150
Look ok?
-Michael
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Joined: Jun 2005
Posts: 19,338
Total Cats: 574
From: Fake Virginia
in case the above weren't clear...
warm up the car
do a DRY compression test first.
then add the drop to teaspoon of oil to the spark plug holes and re run the test.
from the factory service manual:
warm up the car
do a DRY compression test first.
then add the drop to teaspoon of oil to the spark plug holes and re run the test.
from the factory service manual:
COMPRESSION INSPECTION
Warning
2. Charge it again if necessary. (See 01–17–2 BATTERY INSPECTION.)
3. Warm up the engine to the normal operating temperature.
4. Stop the engine and allow it to cool off for about 10 min.
5. Perform “Fuel Line Safety Procedure”. (See 01–14–3 BEFORE REPAIR PROCEDURE.)
6. Leave the fuel pump relay removed.
7. Remove the spark plugs. (See 01–18–3 SPARK PLUG REMOVAL/INSTALLATION.)
8. Disconnect the ignition coil connector.
9. Connect a compression gauge into the No.1 spark plug hole.
10. Fully depress the accelerator pedal and crank the engine.
11. Record the maximum gauge reading.
12. Inspect each cylinder as above.
Warning
• Hot engines and engine oil can cause severe burns. Be careful not to burn yourself during removal/installation of each component.
1. Verify that the battery is fully charged.2. Charge it again if necessary. (See 01–17–2 BATTERY INSPECTION.)
3. Warm up the engine to the normal operating temperature.
4. Stop the engine and allow it to cool off for about 10 min.
5. Perform “Fuel Line Safety Procedure”. (See 01–14–3 BEFORE REPAIR PROCEDURE.)
6. Leave the fuel pump relay removed.
7. Remove the spark plugs. (See 01–18–3 SPARK PLUG REMOVAL/INSTALLATION.)
8. Disconnect the ignition coil connector.
9. Connect a compression gauge into the No.1 spark plug hole.
10. Fully depress the accelerator pedal and crank the engine.
11. Record the maximum gauge reading.
12. Inspect each cylinder as above.
• If the compression in one or more cylinders is low or the compression difference between cylinders exceeds the maximum, pour a small amount of clean engine oil into the cylinder and inspect the compression again.
— If the compression increases, the piston, the piston rings, or cylinder wall may be worn and overhaul is required.
— If the compression stays low, a valve may be stuck or improperly seated and overhaul is required.
— If the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or the cylinder head is distorted and overhaul is required.
— If the compression stays low, a valve may be stuck or improperly seated and overhaul is required.
— If the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or the cylinder head is distorted and overhaul is required.
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