Thunderbolt V Equipped Engines
IMPORTANT: In order to properly set idle speed,
the ignition module MUST BE locked in the “Base
Timing Mode”. This is necessary because of the
“Idle Speed Control” feature that exists in the
ignition module. See information on the previous
pages about this feature.
ADJUSTING IDLE MIXTURE
The procedure for adjusting carburetor idle mixture
canbefoundintheappropriateengineservicemanu-
al. This procedure also requires that the ignition mod-
ule be locked in the “Base Timing Mode”.
2.
3.
Connect a shop tachometer to engine.
Using a jumper wire, connect the ignition system
timing lead “13” (PUR/WHT wire) to a good en-
gine ground (–). This locks the ignition module
into the “Base Timing Mode”.
IMPORTANT: In order to properly set idle mixture,
the ignition module MUST BE locked in the “Base
Timing Mode”. This is necessary because of the
“Idle Speed Control” feature that exists in the
ignition module. See information on the previous
pages about this feature.
4.
Start engine and allow it to reach normal operat-
ing temperature. Place the remote control lever
in forward gear, idle position.
1.
Using a jumper wire, connect the ignition system
timing lead “13” (PUR/WHT wire) to a good en-
gine ground (–). This locks the ignition module
into the “Base Timing Mode”.
5.
6.
Adjust idle speed to recommended RPM.
Stop engine. Readjust cable barrel and reinstall
the throttle.
2.
3.
Adjust idle mixture following the procedure in the
appropriate engine service manual.
IMPORTANT: Be sure to disconnect the jumper
wire from the ignition system test terminal before
attempting to resume normal operations. If the
jumper wire is left in place, the ignition module
will operate in the “Base Timing Mode”. This
means that the additional timing advance fea-
tures would not be functioning.
Remove the jumper wire from the timing terminal.
ADJUSTING ENGINE IDLE SPEED
This procedure should be done with boat in the water,
drive unit in neutral and engine at normal operating
temperature. Refer to the Operation and Mainte-
nance Manual for the correct idle speed.
7. Remove the jumper wire from the timing terminal.
1.
Disconnect the throttle cable from carburetor.
Index
5B-16 - WEBER 4 BARREL CARBURETOR
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
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