Base Engine Misfire With Abnormal Valve Train Noise; Base Engine Misfire With Coolant Consumption; Base Engine Misfire With Excessive Oil Consumption; Engine Noise On Start-Up, But Only Lasting A Few Seconds - Suzuki XL7 2007 Service Manual

Base Engine Misfire with Abnormal Valve Train Noise

Worn or loose followers, valve rocker arms
The follower, valve rocker arm, roller bearing should be
intact and in the proper position.
Stuck valves
Carbon buildup on the valve stem can cause the valve not
to close properly.
Excessively worn or mis-aligned timing chain or chains
Worn camshaft lobes
Sticking SHLAs, lifters

Base Engine Misfire with Coolant Consumption

Faulty cylinder head gaskets and/or cracking or other
damage to the cylinder heads and engine block cooling
system passages. Refer to "Diagnostic Starting Point -
Vehicle Diagnostic Information: ".
Coolant consumption may or may not cause the engine to
overheat.

Base Engine Misfire with Excessive Oil Consumption

Worn valves, valve guides and/or valve stem oil seals
Worn piston rings
Oil consumption may or may not cause the engine to
misfire.

Engine Noise on Start-Up, but Only Lasting a Few Seconds

Incorrect oil filter without anti-drainback feature
Incorrect oil viscosity
High stationary hydraulic lash adjuster (SHLA), valve lifter,
leak down rate
Worn crankshaft thrust bearing
Damaged or faulty oil filter by-pass valve
Cause
Cause
Cause
Cause
Correction
Replace the followers, valve rocker arms, as required.
Repair or replace as required.
Replace the timing chain or chains and sprockets as
required.
Replace the camshaft or camshafts and SHLAs, valve
lifters.
Replace the SHLAs as required.
Correction
• Inspect for spark plugs saturated by coolant. Refer to
"Spark Plug Inspection: " for the 3.6L engine.
• Perform a cylinder leak down test.
• Inspect the cylinder heads and engine block for
damage to the coolant passages and/or a faulty head
gasket.
• Repair or replace as required.
Correction
1. Inspect the spark plugs for oil deposits. Refer to
"Spark Plug Inspection: ".
2. Repair or replace as required.
1. Inspect the spark plugs for oil deposits. Refer to
"Spark Plug Inspection: ".
2. Inspect the cylinders for a loss of compression. Refer
to "Engine Compression Test".
3. Perform cylinder leak down and compression testing
to determine the cause.
4. Repair or replace as required.
Correction
Install the correct oil filter.
Drain the engine oil and replace with the correct viscosity
oil.
Replace the SHLAs, valve lifters, as required.
• Inspect the thrust bearing and crankshaft.
• Repair or replace as required.
• Inspect the oil filter by-pass valve for proper operation.
• Repair or replace as required.
Engine Mechanical: 1D-29