Like Tree0Likes

ECU Problems

Reply
Old 06-20-2007, 12:21 AM
  #1
Registered
Thread Starter
 
Join Date: Jul 2006
Posts: 5
Default ECU Problems

Hello all, I am hopeing someone can help me. I put a Supercharger on my 99 7.4 MPI last year which has turned out to be a year long problem. After installing it, I found that the factory ECU had a very low rev limit (4500), so I asked Supercharger about getting that changed. They recomended Arazona Speed and Marine. I sent it off to have them bump up the rev limiter. They called me recomending making many other changes to which I agreed since they said it would just make things better for me.

I got it back and the boat would not keep runnning. I sent it back, they noticed that they had not changed the ECU from a 4 bar to a 2 bar sensor, but they had sold me a new 2 bar to go with it. I spend another $45 in shipping to have them re-program again. Once I got it back that time, the boat ran, but I found that something else was wrong. No matter what the RPM, if I push my throttle past the 3/4 mark (either out of the hole or gradually), once I get past the 3/4 mark, the engine startes to stall and I get an engine alarm. Once I back it off below the 3/4 mark, after about 30 sec, the alarm goes away.

I spend $45 in shipping again and had them re-program to fix the problem, but after re-programming again (or so I was told), it is still doing the excact same thing. I asked them to just put it back to factory (which was an FE28) and they said they don't have the program to do that.

So I feel I am faced with no option but to purchase a new ECU as an FE28 in order to get my boat running correctly again and just forget about moving up the Rev Limiter. But I cannot seem to find anyone on-line who can sell me a new one.

Does anybody have an suggestions on how to either fix my problem or get a new ECU?

Thanks
Dave
dmueth is offline  
Reply With Quote
Old 06-20-2007, 07:12 AM
  #2
OSO
Super Moderator
VIP Member
 
OSO's Avatar
 
Join Date: Oct 2003
My Boats: I like them all!!
Posts: 2,730
Default

just out of curiosity did you call precision marine and ask them, they are ecu experts.

http://www.offshoreonly.com/links/sh...&searchid=1590
OSO is offline  
Reply With Quote
Old 06-20-2007, 08:53 AM
  #3
Registered
 
Join Date: Feb 2004
Location: MT. JULIET, TN.
My Boats: '99 33 Outlaw HP 500's,
Posts: 3,698
Default

Quote:
Originally Posted by OSO View Post
just out of curiosity did you call precision marine and ask them, they are ecu experts.

http://www.offshoreonly.com/links/sh...&searchid=1590
Ditto.
kennyo is offline  
Reply With Quote
Old 06-20-2007, 09:26 AM
  #4
S.O.B (single O/B) now
Platinum Member
 
t500hps's Avatar
 
Join Date: Sep 2004
Location: Richmond VA
Posts: 7,921
Default

Precision did the ECU work on my new motors....I had a few problems (mainly my fault) and Mark went above and beyond to get things right for me.
t500hps is offline  
Reply With Quote
Old 06-20-2007, 10:37 AM
  #5
SORE MEMBER
Platinum Member
 
Wobble's Avatar
 
Join Date: Apr 2004
Location: 2950'49.74"N 95 5'17.55"W.......TEXAS
My Boats: SeaDoo RXP & RXP-X, Stryker Equalizer 28, Eliminator Daytona Jet
Posts: 6,707
Default

could it be that your fuel system is not keeping up?
Wobble is offline  
Reply With Quote
Old 06-20-2007, 11:11 AM
  #6
Registered
Thread Starter
 
Join Date: Jul 2006
Posts: 5
Default

No, not fuel, like I said, it does not matter what the RPM level is, it is based on postion.
dmueth is offline  
Reply With Quote
Old 06-20-2007, 11:13 AM
  #7
Registered
 
Join Date: Sep 2005
Location: spring lake, mi
Posts: 0
Default

I don't get why people are not doing custom tunes on these boats. You are playing with fire doing mail order tunes with forced induction. Its amazing that the boating industry is 15 years behind what we are doing with hot rods right now. I would be using GM computers and have a professional tuner on my boat with me. Then have it run right, the way I want it. We are doing this with all the new GM cars right now.

We have made 700rwhp on stock ls2's in the cars. Thats right only 6.0l's of motor. Then having them last 20k plus miles.

Just my thoughts take them for what they are worth.
hellbents10 is offline  
Reply With Quote
Old 06-20-2007, 12:37 PM
  #8
Registered
 
Join Date: Oct 2004
Location: Newbury Park, CA
Posts: 1,425
Default

Welcome to the world of speed-density fuel metering. You CANNOT tune the ECU without having the engine present with a wide band oxygen sensor installed. Shame on ASM for taking your money. They are ripping people off.

Michael
Michael1 is offline  
Reply With Quote
Old 06-20-2007, 02:31 PM
  #9
VIP Member
VIP Member
 
thunderusone's Avatar
 
Join Date: Jul 2003
Location: Mt Juliet, TN
My Boats: Previous 37 OL Current 42 Outerlimits
Posts: 2,161
Default

ANY ECM tuning outside of a dyno with a wideband O2 or in the boat with a wideband O2 is a complete shot in the dark. If you even get close, you are lucky. I am amazed how much my AFR changes just with different props!
thunderusone is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
01hammer
General Q & A
36
08-10-2008 05:01 PM
unbroken
General Q & A
6
12-10-2006 07:17 PM
double deuce
General Q & A
3
01-13-2005 10:18 AM
seamate
General Q & A
1
11-19-2004 02:38 PM
26sonic
General Q & A
2
09-04-2002 11:46 AM



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 12:09 AM.


Copyright 2011 OffShoreOnly. All rights reserved.