2001 200 EFI, Lack of Low End Power

[CLAYC]

2001 200 EFI on 20' Triton TR20...

Engine on 3rd rebuild (don't get me started on that one). Has no power on hole shot. When you hammer the throttle, it will hesitate for a second or two then will rev up to about 3300-3400 rpm. The R's will remain at that until the boat finally starts dropping the nose, then the engine will drop approx. 200-300 rpm. As soon as RPM drops, it will hold for a second or two, then it will suddenly / immediately jump to about 3500-3800 rpm and continues building power and rpm as it should. Top end is good, running about 5600 in this hot weather fully loaded.

I've had problems with this engine since I purchased the boat (used) in 2004. Been to Merc tech, he can't find problem..

Here's a list of what I know or has been done to the engine.. Cyl Compression: #1-110, #2-115, #3-112, #4-120, #5-118, #6-115, Injector Svc and ECU Ck by Tony Bracato, Engine timing at spec, TPS at spec, all bleed lines are new, fuel pmps in spec, Spark and CDM's in spec, starts and idles just fine, no misses.

Yesterday; 2 adults, one child, 1/2 tank of fuel, 1 live well 3/4 full; took forever to crawl on top of water, ran good on top.

Any and all suggestions are greatly appreciated, thanks again...

 

[CLAYC]

Re: 2001 200 EFI, Lack of Low End Power

???????????anyone???????

 

[starcraft1982]

Re: 2001 200 EFI, Lack of Low End Power

you really need to give some detail of past issues.Especially what caused the rebuilds.It seems you may have a problem that isnt being addressed.But w/out info.,theres no way to even guess.Was it overheat issues?,fuel delivery issues?.the running issues could be something easy(relative)to fix,but absolutely no way to tell right now.I would suggest doing some investigating in your area and find a GOOD,qualified,experienced mercury guy and get it to him asap.There are just so many variables w/your situation.You MAY end up fixing it through the great guys on here,but,unless you get pretty lucky,it could take A LOT of troubleshooting,and A LOT of time.If want some "tries" soon on here,post some current compression numbers check spark to all cylinders,and pull the plugs and tell what you see.Help get this ball rolling..

 

[starcraft1982]

Re: 2001 200 EFI, Lack of Low End Power

Let me clarify a little bit.Has youre engine EVER ran properly since last rebuild?Are compression numbers current(has damage occured since readings were taken)?is one or more cylinders not getting proper fuel causing a lean condition(spark plugs can hint to that).Is one or more cylinders not getting proper spark(7/16" gap jump w/bright blue spark)?And again,what caused engine failure in past?Any of those?overheat?This info will get your responses started.Any responses before this info is given will be strictly guessing.

 

[CLAYC]

Re: 2001 200 EFI, Lack of Low End Power

Ok, to clarify a bit... Current engine compression listed in first post... Plugs look good, no signs of over fuel or lean conditions. Spark is hot,,, jumps gap with ease.. Fuel pressure sits at 36-38 psi..

First rebuild: (had boat for less than 3 mo) Control Module cashed on lake.. took it in, replaced, ran on dyno, hung ring on #5, broke piston... Sleeve cracked, replaced sleeve and piston... Ran ok for about 4-5 mo... cold weather came.

Second rebuild: Cold weather fishing trip, let engine warm up, ran 3/4 mile, cold seized #5... bored metal out of cyl, replaced with .010 over piston.. and replaced other 5 pistons as precaution (std bore). Ran engine for less than 100 hrs

Third: Warm weather fishing. #1 piston broke/ lost ring pin, top ring spun on piston, bye bye top of piston.. Piston manufacturer paid for all parts for rebuild..

I first started noticing hole shot issues after first rebuild. (Not sure if I was just getting use to how boat / engine ran...) First thing in morning (or first couple hole shots) is doesn't do it as bad, seems to get worse as day on water progresses....

I've also replaced the Voltage Regs and a stator approx 3-4 yrs ago...

The biggest problem I've seen with the Tech's is the ones around here wanna spin it on the dyno instead of water. I can assure you, I can't replicate the problem on a dyno..

I'm kinda leaning toward the Stator,, is it possible that the low side is not building enough current, then it reaches 3300-3400 rpm (low side switches to high side) then bingo, Power? How would I check that?

 

[CLAYC]

Re: 2001 200 EFI, Lack of Low End Power

Recently spoke to a local retired tournament guy, who said he had nothing but problems out of a '02 200 EFI. He had it rebuilt 2x by same tech, third time he took it 200 miles from home to another tech for rebuild. Had problems again.. He mentioned something about the fuel rail being issues in the 200 EFI.. He got mad and traded EFI on a late model Opti.. Had no issues with Opti and plenty of power. (Not sure how many hrs this guy puts on engines, but he said he averages burning 4-5k in fuel a yr)

I'm just tired of Merc Tech shop rates. I've built big hp V-8's (some on NO2) for over 20 yrs and work on my Ford Diesel with ease. But, I still can't resolve this issue.

Thanks again...

 

[CLAYC]

Re: 2001 200 EFI, Lack of Low End Power

Hhmmmmm?

 

[CLAYC]

Re: 2001 200 EFI, Lack of Low End Power

Any idea's fella's?

 

[Faztbullet]

Re: 2001 200 EFI, Lack of Low End Power

Hey clay call me tonite.... you should have number if not I sent it to your pm..