Like Tree0Likes

trouble shoot this one.

Old 04-21-2002, 10:10 PM
Platinum Member
Charter Member
Join Date: Jan 2001
Location: so. WI
My Boats: Formula
Posts: 1,562

I've got an '88 as well but with the 350 TBI- I had similar problems on a trip to Canada- we tried a different ignition module (always carry a spare) but that didn't fix it. Payed good money for an in-tank fuel pump as well- no luck there. The fuel pump is a possibility in your situation.
Mine turned out to be the ignition coil. Ran fine no-load, couldn't get out of its own way under load. BTW, the coil checked OK doing the winding check per the MM.
jafo is offline  
Reply With Quote
Old 04-21-2002, 11:29 PM
Turbojack's Avatar
Join Date: Sep 2001
Location: Houston, TX, USA
My Boats: 2003 Eliminator 30' Daytona
Posts: 2,285

Is the "check engine light" coming on? If so check & see what code. I would try map sensor. Had 87 ford & had same problem. Turned out to be map sensor.
Turbojack is offline  
Reply With Quote
Old 04-22-2002, 01:17 AM
Charter Member #232
Charter Member
Audiofn's Avatar
Join Date: Oct 2000
Location: Carlisle, MA USA
My Boats: 1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
Posts: 18,379

I was thinking fuel delivery problem.

Put your best foot forward!
Audiofn is offline  
Reply With Quote
Old 04-22-2002, 02:15 AM
Charter Member #94
Charter Member
Gordo's Avatar
Join Date: Oct 2000
Location: New Port Richey, FL
My Boats: 1999 Active Thunder 25' Factory 1 Race Edition
Posts: 2,646

Even with a good description in your post, it's really hard for even the best technician to lay his hands on the computer monitor and suddenly have the "fix" come to him as opposed to actually being there and seeing/hearing the signs & symptoms. I must agree with a few that have already mentioned it, Check Fuel Pressure! My first guess would be a fuel pump in the tank going south.
Gordo is offline  
Reply With Quote
Old 04-22-2002, 08:57 AM
Charter Member#93
Charter Member
Ike's Avatar
Join Date: Oct 2000
Location: The Burbs
My Boats: 1989 41ft Apache Indian Outlaw
Posts: 1,127

Check gasket between throttle body and intake manifold, common problem.
Ike is offline  
Reply With Quote
Old 04-22-2002, 11:31 AM
Posts: n/a

the four things that come to mind are plug wires, retarded timing, bent or broken push rod, or a flat cam. I have been the victim of all the above and for the valve train stuff pull the valve covers and watch for a short stroking valve while cranking.
Reply With Quote
Old 04-22-2002, 02:41 PM
Posts: n/a

ok, i gave up yesterday, truck is in the shop today, i'll pay the $79 to find out what's wrong with it. i did do a sensor check with a code key, it flashed 44, which signals lean exhaust, 02 sensor (2 months old)and map sensor. waterfoul i'm starting to wonder if you are right about the cat. converter, i am starting to get an exhaust leak from the manifold, last time i had one the rear converter was clogged and blew out both exhaust manifold gaskets.
Reply With Quote
Old 04-22-2002, 06:51 PM
jbrauer's Avatar
Join Date: Sep 2001
Location: Nashville, TN
My Boats: 2003 Spectre 36' Poker Run
Posts: 567

Ike mentioned somtething that I was thinking as well - a vacuum leak maybe the throttle body gasket, maybe something else.

Whatever you find be sure to let us know!
jbrauer is offline  
Reply With Quote
Old 04-22-2002, 08:35 PM
Airpacker's Avatar
Join Date: Aug 2001
Location: Aurora Ontario
My Boats: little cat...BIG MOTOR
Posts: 4,008
Default code 44 and stumble under load,

my money is on the fuel are describing a classic lean missfire condition.
Airpacker is offline  
Reply With Quote
Old 04-23-2002, 03:02 PM
Posts: n/a

ok, i talked to the mechanic today,he knows what it's doing he just doesn't know why. he said it's running lean at idle,no vaccum leaks found, he doesn't know how to check fuel pressure from the in tank fuel pump, they're rigging somethng up to test it.
at least i'm not theonly one guessing at this one. he also ruled out the fuel injectors.
seee ya
Reply With Quote

Related Topics
Thread Starter
Last Post
General Q & A
07-15-2007 08:11 PM
General Boating Discussion
09-01-2005 10:10 AM
General Boating Discussion
08-28-2002 09:15 AM
General Boating Discussion
08-21-2002 02:41 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 09:10 AM.

Copyright 2011 OffShoreOnly. All rights reserved.