1998 225 EFI serial umber #OG666608
414.9 Hours
Anyone ever come across a mid rpm engine surge or miss? Happens after take off and planed out and backed off between 2-3000 RPM
Boat is at mechanics:
Spark test- OK
Throttle Positioning Sensor -OK
Spark pugs- looked OK
Compression Check- OK
Occasional Sneeze when idling in gear..... not sure if this has anything to do with the surging/ miss or not
Last edited by Drakecaller; 03-06-2018 at 04:14 PM.
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
^^^^ anyone ????
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
Check the fuel pressure.
Thank you Savage for the reply!
What kid o numbers are typical ?
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
Around 36 PSI.
I would also inspect the bobbins on the stator.
^^^ Good advice.
Also check the BLEED lines, especially the ones hidden behind the oil tank, electrical plate, etc.
It is unusual for an engine to plane off and remain on plane in the 2000-3000 RPM range (unless you're in something other than a bass-boat, perhaps?)
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Don,
202 Coral by Viper
it gets up on step then can cruise at those RPM's with trim manipulation
Thank you guys for the replies.....
I will post up results
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
lean pop or sneeze is a good indication of lean mtr from something, look closely at TPS setting also,hard on reeds also
.................................................. ...the scariest thing in life is the unknown ...................................
^^^^this or lean injectors
What is turn around time on getting injectors cleaned/ calibrated?
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
About three days right now.Originally Posted by Drakecaller
Savage,
Bobbins checked ok
Fuel pressure 36 not running, 32-34 at idle ....is that typical?
Last edited by Drakecaller; 03-08-2018 at 11:21 PM.
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
Did you visually check the stator for discoloration ? Can be better than a meter test.
+1
I would also be looking at the TPS for a "dead-spot" in that area (voltage sweep test).
One other note to make... if you speed up 500 RPM's, does this "problem" go away?
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Don,
Sweep Test checked out good
and ...
Seamed if I got out of the 2-3000 rpm range surge would go away but 2000 to 2500 still surged
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
Discoloration of the bobbins?
Redundant grounds?
Here's a quote from Don about "redundant grounds":
"Cheap item for you to try... and yes, I've seen it make a difference.
On the coil plate, add TWO (10) gauge REDUNDANT GROUNDS.
First one to the right-top 8mm head screw (where CDM grounds are), second one to the lower ECU "right bottom screw" (likely is a ground there now, already).
Loop the upper wire OVER the top of the block, and then install a ring-terminal so it terminates at the same bolt the battery NEG. cable is attached to.
Loop the LOWER wire UNDER the STB bank of cylinder, and then install a ring-terminal so it terminates at the same bolt the battery NEG. cable is attached to.
When done... go run it and see if there's any difference".
You may also be chasing a "transitional ghost". ALL 2-stroke reed-type engines have an RPM at which the reeds are transitioning from "mostly closed duration" to "mostly open duration".
This RPM range is usually 300-600 RPM's (depending on engine/condition), and the engine simply doesn't run well in that range. Either side of the RPM range- runs great.
There are things you can do to "move" the range or "lessen" the range, but it WILL be there (somewhere).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Hey Guys,
Just a quick update....
Sent injectors off to get checked out.. replaced two injectors (lean) calibrated one (rich) and are in route back to CA, Thank you Rich!!!
New reeds...all the reed petals looked good except one.....could lean sneeze cause metal reed failure?
Bobbins look good...
Added grounds as per Don's post..
Anticipating getting it all put back together and getting back out on the water......And seeing how It goes.....
Tim Stewart
\"98 Viper Coral 202
\"98 Mercury 225EFI
25 Tempest Plus B&B from Mark\'s Propellers
yes sir
.................................................. ...the scariest thing in life is the unknown ...................................
Yes lean sneeze can cause reed failure.Hope you didn't install NEW steel reeds.
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