Kohler Aegis LH640 User Manual download pdf (Page 17)

Troubleshooting

If the MIL comes on, or the engine becomes hard to

start, runs roughly, or stalls at low idle speed, initial

checks should be made in the following areas:

• Make sure the fuel tank is filled with clean, fresh

gasoline, and shut-off valve (if so equipped) is

opened completely.

• Make sure fuel tank vent cap is not blocked and it

is operating properly.

• Make sure the air cleaner element and precleaner

are clean and all components are properly

secured. Clean or replace as necessary.

• Make sure the proper fuel filter is being used, and

it is clean and unobstructed. Replace filter only

with genuine Kohler parts.

• Make sure all connections to sensors, ECU, and

fuel injectors are properly secured.

• Make sure a good 12 volt battery is being used

and is fully charged.

If these checks do not correct the problem, or the MIL

remains on, further diagnosis and servicing by an

authorized Kohler Engine Dealer is necessary.

Adjustment – EFI Throttle Body

Low Idle Speed (RPM) is the only adjustment that

can be made. All other fuel calibrations are

permanently preset and controlled by the ECU. The

standard low idle speed is 1500 RPM* (+ 75 RPM).

*NOTE: The actual low idle speed depends on the

application -- refer to equipment

manufacturer's recommendations.

When an EFI engine is started cold, the ECU will be

using internal programming for cold running, and the

idle speed may vary from the manual setting. Do not

attempt to perform any readjustment during this

‘‘warm-up’’ period.

If adjustment is to be made, the engine must be at

operating temperature, air cleaner in place, and check

engine light must be off (no fault codes present).

1. Start the engine and run at half throttle for 5 to

10 minutes to warm up.

2. Place the throttle control into the idle or slow

position.

3. Turn the low idle speed adjusting screw in or out

and check RPM with a tachometer. See Figure 27.

Figure 27. EFI Throttle Body Manifold.

Troubleshooting

When troubles occur, be sure to check the simple causes which, at first, may seem too obvious to be considered.

For example, a starting problem could be caused by an empty fuel tank. Some common causes of engine troubles

are listed in the following table.

Do not attempt to service or replace major engine components, or any items that require special timing or

adjustment procedures. Have your Kohler Engine Service Dealer do this work.

Will Not Start ••• ••••

Hard Starting •• • • • •

Possible Cause No Improper Dirt In Dirty Incorrect Engine Dirty Air Faulty

Problem Fuel Fuel Fuel Line/SystemGrass Screen Oil Level Overloaded Cleaner Spark Plug

Stops Suddenly • ••••••

Lacks Power •••••••

Operates Erratically ••• • ••

Knocks or Pings ••• • •

Skips or Misfires ••• ••

Backfires •• • ••

Overheats ••••••

High Fuel Consumption •••

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Kohler Aegis LH640 User Manual Page 17

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