TROUBLESHOOTING
SERVICE MANUAL NUMBER 26
Engine Runs Poorly At Idle
Cause
Special Information
Clogged flame arrestor
Improper idle fuel mixture adjustment
Problem in ignition system causing the
engine to run rough
Idle mixture screw adjusted incorrectly
Bad needle and seat
Engine floods at idle
Incorrect float level drop
If carburetor (2 barrel only) has a solid
needle, replace with a spring loaded
needle
Moisture on ignition components
Water in fuel
Cap or spark plug wires arcing
Low grade or stale fuel
Incorrect ignition timing
Automatic choke
Spark plugs
Fouled, burned, cracked porcelain
Insulation breakdown, wires broken
Spark plug wires
Defective coil
Cracked or dirty distributor cap
Incorrect float level
Dirty carburetor
Vacuum leak
Leak at manifold or carburetor base
Too low - can’t supply the carburetor
Too high - unseats the needle and seat
Incorrect fuel pump pressure
Low compression
Also check for blown head gasket
Timing changes
Loose or worn distributor
Head gasket, exhaust manifold, cracked
head or valve seat
Water leaking into cylinders
Loose or broken engine mounts
Index
Page 1C-18
90-861329--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(6 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews. Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke