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2.4 Bridgeport Losing
Power
Hi Randy,
I recently found the IHR website, enjoy checking out Tech Talk, and have
picked up some useful tips. Here's my problem:
Just recently put my Voyager in for the first run of the season (very late
start, the Allegheny River in Pittsburgh stayed high with lots of debris).
I've run a carburated 2.4 Bridgeport for years. The engine ran great
for the first 10-15 minutes at various RPM's, then I lost power. The
engine still ran, but I dropped off plane, and couldn't get going again at
much more than high idle. Being the first run of the year, I figured
fouled plugs from winter storage seal in engine and stabilizer in gas tank
still burning off. Went back to my dock, put in new plugs (NGK BUHW)
and topped off with 94 Octane fresh Sunoco land gas. Engine starts
and idles okay, but no power.
Thinking it might be a switch box, I pulled the boat, put the engine in a
makeshift test tank and started it. Using a timing light, I see all
six cylinders fire at idle. The strange thing is when I rev it up,
one bank (all three
cylinders) cuts out at approx. 3000 RPM. The bank that cuts out is
the right hand side looking from rear, cylinders 1-3-5, inner switchbox. I
don't mind spending money on electronics, but I've heard horror stories of
spending a fortune trying to diagnose and putting on new parts that don't
solve the problem. My brother had the "good" switchbox
(same P/N as mine) from replacing the pair when one went bad on his 200
Mercury last year, so I swapped it with the inner box, same problem.
I then swapped again, so my original boxes are now back on, but
inner/outer were reversed. Same problem. My local outboard mechanics
are willing to offer advice, since they're really too busy to work on it
anyway. At their suggestion I flipped the 5-6 coil to see if that changed
the problem: it didn't. 1-3-5 continue to cut out over 3000 RPM.
It seems I'm down to the trigger or stator, unless the switchbox(es) could
still be the problem? A high speed spark advance module is shown in
my Clymer manual for some V6 engines, but I don't physically see one on
mine. Everyone seems stumped by the fact that engine idles on all six, but
cuts out on three. They think a switchbox, trigger, or stator should
either work or fail. Maybe you've run into this problem.
Again, I'll buy new boxes if I need to. I just hate to shell out the
bucks and find I still have the same problem, and need to spend more.
Sorry for the lengthy explanation, but I'm hoping I've eliminated some
possible problems. I'd really appreciate any advice or additional
tests I can perform. I have a trigger (used and good, but replaced
incorrectly by a mechanic trying to fix what turned out to be a bad
stator) on the way from a friend. Hoping you can help point me
in the right direction. If you need any extra info. let me know.
Thanks again for your time and help. I'm sure this is a busy time
for you.
Looking forward to getting back on the water.
Luke Mattocks
Luke,
I like the detailed message. It helps with the recommendation. It's the
Stator. It has a low speed and Hi-speed charge coil and the Hi is dead to
one switch box. The fact it works at idle rules out the switchbox,
triggers, or the coils. Stator it is!
Randy
Please submit
whatever questions you have to IHRTechTalk@yahoo.com.
All questions and answers selected will be displayed on this page as they
come in. Note: though all boaters are welcome, priority may be given to
I.H.R.
members. Randy can not be held responsible for any advice
given. Though his information and expertise is second to none, he
has no control over what you do with your boat. It is up to you to
boat safely and act responsibly, and his advice is only to be used as a
guidance for your high performance boat/motor of which you are the one
responsible for the risks involved.
Thanks,
Mark C.
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