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  #11  
Old 03-05-2014, 07:31 PM
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Quote:
Originally Posted by JimN View Post
MEFI 1 had an external knock sensor module and the relay outputs were positive voltage, rather than grounding. If it becomes necessary to change to a later ECM, inverting the relay output is easy and only requires one additional relay for each of the exiting ones. Since these relays are extremely reliable, it shouldn't be seen as a chance for reliability issues, unless the person doing the work can't make reliable connections. The location of the ECM and MAP sensor were changed later, too. One thing to look at is the rubber line connecting the MAP sensor to the intake- over time, the rubber can become dry and brittle, causing high idle, hunting for the correct RPM when the throttle isn't moved and if the line collects any liquid, performance can be sluggish on acceleration.
Any idea what it costs to upgrade an ECM or replace a MAP sensor connecting line? Are these straight ahead "plug and play" repairs or are they best left to a certified pro?
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  #12  
Old 03-05-2014, 07:33 PM
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map sensor easy - upgrading to a new ECM could thousands. There's an couple of MEFI 1's on ebay right now for $500 - and $750
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  #13  
Old 03-05-2014, 07:40 PM
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So I'm clear, are these issues just a matter of time as a boat ages? Are they from abuse or poor maintenance/care? Or are we just talking about "Electronics Russian Roulette", sometimes you just draw the short straw?
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  #14  
Old 03-05-2014, 08:01 PM
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I bought a spare MEFI 1 cuz I got it for $50 and it worked. all the other sensors and relays can be bought at local autoparts and marine shops like skidim.com - also bought a spare fuel pump - cuz I got a deal on it from rockauto a year ago. The MEFI's should go thousands of hours if they don't get blown. You should be good... if everything works. The MEFI is encased in a gelatin inside the casing so it won't oxidize or corrode - moisture on the other connections could cause issues.

everything will eventually fail.... but I picked up parts that are hard to buy.... enables my MCOCD
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  #15  
Old 03-05-2014, 08:06 PM
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Like mikeg205 said in post#2 they did play around with the location of the ECU. I had a 94' with the TBI and the ECU was mounted under the starboard exhaust manifold. Not really an ideal location. On my 96' it was mounted up top, bolted to the thermostat housing.
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  #16  
Old 03-05-2014, 08:25 PM
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Thanks all. One more semi-related question. Seller stated that this is a 285hp engine. Other examples of the 5.7TBI found on this forum are 275hp. Were there different hp ratings for different boats or different engine/trans.combinations?
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  #17  
Old 03-05-2014, 08:30 PM
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I never saw a 285 Chevy 350 TBI - IIRC
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  #18  
Old 03-05-2014, 08:30 PM
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No.TBI was 275.
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  #19  
Old 03-05-2014, 08:56 PM
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Thanks all. I'm heading over to see it next Thursday. I'll take some pictures and let you know how it plays out. Andre, I thought I was going to be in your neck of the woods but the boat is still 3hrs away from you. How many more purple 94's do you think could be found within a few hours of Sherbrooke?
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  #20  
Old 03-05-2014, 09:13 PM
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Quote:
Originally Posted by André View Post
93 was only LT 1.(multi port injection)
TBI(Throttle body injection) for 94-95 was the same.In fact,i think the TBI remained the same for a couples more years on the Predator engine(?).
Got a 96 EFI (both TBI and LT 1) manual if you ever need info.
PM sent. I would like to get a copy of that 96 manual. Sorry for thread jack
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