91 Evinrude 140 Problem?

[N1NE1]

hello, i took my boat out yesterday and wasnt running so well,had a bad miss/sputtering but wasnt stalling at any speed.sometimes when i went to push full throttle the motor would only go at an idle speed but would be slightly louder,so i would back off and try full throttle again and it would go to full. sometimes it would run ok with no miss and sometimes it wouldnt,mostly it was missing,at first i thought it may have something to do with the gas/maybe water in it but kind of ruled that out because it wasnt stalling. im thinking it may be powerpack starting to die???pulled the plugs to see if any were fouled and none were..where to start....

 

[ezeke]

Re: 91 Evinrude 140 Problem?

Compression test, then spark test.

Check spark with a tester capable of preset to at least 3/8" and look for a sharp blue spark.

All spark plugs must be removed and then grounded to the engine block while testing to prevent damage to the powerpack. Also, do not pull plug wires on a running CD motor, you will destroy the powerpack.

If you use a CDI tester or similar homemade device, you can check all of the cylinders at once and skip trying to keep the other plugs grounded.

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

all cylinders read 120-125lbs,spark on all are strong but not completely blue, one or 2 have a few blue/orange sparks randomly

 

[ezeke]

Re: 91 Evinrude 140 Problem?

Check the ignition coils carefully especially the ground contacts and ground wires. I usually take them off and clean the base so that I am sure.

If any ignition coils are cracked, discolored, or if the potting material is melted, replace the coil.

Look up under the flywheel for any signs of damage to the stator.

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

all coils are only a few months old, all connections are tight and clean,i'l take the flywheel off tomorrow and check that out. any idea what the ohm/resistance reading should be on each coil? when motor not running

 

[N1NE1]

Re: 91 Evinrude 140 Problem? --PLEASE HELP--

Re: 91 Evinrude 140 Problem? --PLEASE HELP--

TOOK OFF FLYWHEEL AND EVERYTHING LOOKS PERFECT,NOT EVEN ANY SIGN OF A SLIGHT CORRISION.IT IDLES FINE, I REALY ONLY NOTICE WHEN DRIVING IT.I THINK I MAY TRY OUT SOME -SEA FOAM- IF THAT DONT WORK I MAY START WITH A POWERPACK. THE WEIRD THING IS I CANT HEAR A MISS WHILE RUNING ON MUFFS BUT WHEN IT GOES INTO THE WATER AND WHILE DRIVING PEOPLE LOOK AT ME LIKE WHY WOULD I EVEN HAVE THE BOAT OUT WHEN ITS MISSING AND SOUNDS LIKE THAT.PROBLEMS LIKE THESE REALLY AGGRIVATE ME AND MAKE ME WANT TO GO MOTOR SHOPPING. IT WOULD BE MUCH EASIER,BUT I WOULD RATHER NOT . -----PLEASE----- HELP SO I DONT HAVE TO GO WASTE THOUSANDS OF $$.

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

took the boat back out today and still runs like crap sometimes, i could be cruising along and it just dies down like i shut it off but dont stall,cant hear any kind of sputter at idle. its just mainly while driving... sometimes it runs fine sometimes it dont

 

[ezeke]

Re: 91 Evinrude 140 Problem?

That's a real shame, because the big bore 90 degree looper is a real fine engine. You really should invest in a factory service manual before you go playing any more parts roulette, though. Part # 507951.

Are you sure that your QuikStart is releasing when it should? Did you re-torque the flywheel to spec 140-150 foot pounds?

BTW, when the engine dies down suddenly on your motor, it is probably S.L.O.W. kicking in in response to a warning signal.

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

I Do Agree That This Is A Great Engine And Very Reliable Thus Far.i Did Torque It Back Down.when I Get The Sputter It Usually Comes Out Of Nowhere. Dies Down Picks Back Up Dies Down. Its Kind Of Like Im Losing All Power ,sounds Like Something Water In Gs Would Do But Im Almost Positive Theres Nothing In It.i Even Have A Big Gas/water Seperator So I Would See The Water If It Was There.i Think I May First Take The Carbs Off And Clean Them To Start, Then Next I Think Start With Powerpack. Its Cheap Enough To Just Pick One Up And If Thats Not The Issue I'l Just Sell One And Go To The Next Part.things Like This Just Aggrivate Me So Much That I Dont Care About A Price It Takes, Just Want It Fixed, How Can I Tell If The Quikstart Is Releasing?

 

[another todd]

Re: 91 Evinrude 140 Problem?

You could have a plugged fuel filter or a fuel line sucking air simulating the same thing.

 

[ezeke]

Re: 91 Evinrude 140 Problem?

That surging could be a fuel restriction or air leak like another todd is saying. Check (or chuck) your anti-siphon valve to make sure that it is not hanging up.

QuikStart is engaged and advances the timing whenever you restart the engine and stays engaged unless the engine reaches around 96 degrees F. or the RPM reaches 1100, whichever happens first If it is working properly, you should feel the engine relax as the timing is returned to normal after warming to 96 degrees.

S.L.O.W.warning system automatically cuts and limits your RPM to 2500 anytime your engine temperature exceeds 203 degrees F. Once S.L.O.W is activated the engine must cool to 162 dgrees and be turned off to return to normal operation.

Both S.L.O.W and QuikStart are advanced features of the powerpack.

S.L.O.W. activation is ample warning to find the source of the problem and repair it before running the engine again.

BTW, Having the temperature switch wires too close to the spark plug wires can trigger some interesting behavior in these motors.

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

Was Doing A Little Work On The Motor/boat Today And Disconnected The Wires From Powerpack To Coils And Noticed There Was Some Corrision/rust On The Connectors. That May Be My Problem,who Knows They Didnt Look Like They Were Great Connections.i Also Changed My Fuel Line From An Old Sticky 5/16 To A New 3/8 Line. The Inside Was A Little Brown But Not Too Bad. The Outside Was Starting To Rot And Was Sticky.installed A New Fuel/water Seperator . Of Course The Connections Were Bigger Than The Old One So I Have To Get Some New Screw-barbed Fittings Before I Can Prime It And Start It Up. I Hope One Of These Fixes Did The Job. I'l Get Back To You Tomorrow

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

i dont know if this matters or what exactly this thing does but on my motor there is a spark dwell adjustment knob that was broke off a few years back so the rod that goes into the know is just free..where can i get part number 0432095 and what exactly does it do.it says its a dealer direct part.do i need it?. the motor always ran fine without it.the threads on the end of this part broke off so the knob has no way of staying on or adjusting

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

Ok I'm out in the boat now, it won't rev too high in gear but out of gear it will rev up. I can't go over 8mph

 

[jonesg]

Re: 91 Evinrude 140 Problem?

Sounds like its not running on all cylinders.

A timing light would show the problem or eliminate elec and point towards fuel delivery.

Also try bumping the choke when you give it gas.

You have internet on your boat...cool.

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

checked the timing and its dead on, also read the manual and it says could be fuel pump, powerpack or coils, checked the coils and theyre fine , they are not over 5 months old with maybe 15 hours on them. should i start with a powerpack or new vro pump?. im just about to the point where its going to a marina to get fixed and i'l deal with getting ripped off...

 

[wilde1j]

Re: 91 Evinrude 140 Problem?

Find what's wrong 1st. Otherwise you may build a new motor from parts. Very expensive!

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

I Did The Series Of Tests That Ezeke Posted On Another Page On How To Test A Vro Pump And The Pump If Fine ,holds Pressure Clickes When Its Supposed To And Holds Vacuum,cleaned The Carbs,checked The Jets,checked The Timing,i Guess It Brings Me Back To Being A Powerpack , Any Other Suggestions. I Read The Manual Over And Over And This Is Pretty Much The Last Thing It Lists

 

[N1NE1]

Re: 91 Evinrude 140 Problem?

Could Just One Bad Coil Make All This Happen? I Hooked Up A Timing Light While In The Water And Found That One Coil Is Dropping Out..seems Too Simple To Make The Whole Engine Drop Out

 

[wilde1j]

Re: 91 Evinrude 140 Problem?

One down cylinder on a V4 is a bunch in terms of power reduction. Did you use a needle gap spark tester to check the spark on all holes? It wasn't really clear if you did that.

One would expect the coils to be OK, but at this point I'd consider having them tested at a shop with a coil tester to rule the coil deal out.

BTW, CDI Rapair has a good ignition trouble shooting guide available as a free download from their website.

Also, running on the hose won't tell anything, other than it will run. Running under load is what counts. Just for yucks, have you tried hitting the choke/primer? Squeezing the primer ball has the same effect. This can help rule out fuel starvation as a culprit.