1988 175 johnson no ldle & misfiring

Have checked firing with tester all plugs firing.when cranked the engine will run for a little while but will pop like a cylinder is not firing.

Jim 1988 J175STLCCM

Re: 1988 175 johnson no ldle & misfiring

Any engine will sneeze/cough when first cold started. Pushing in on the key every few seconds will provide extra fuel during the warmup period, assisting the Fast Start feature on your engine. When warmed up, an engine should not sneeze during normal operation. It can occasionally sneeze (cough) if the carb idle circuits have dried fuel/debris in them. If it runs ok when throttled up just above idle when it is getting fuel from the other jets, then it is probably the idle circuits. These idle circuits are the only way fuel gets into the engine when at dead idle and the throttle butterflys are closed. If this is your problem, you are looking at carb overhauls.

Re: 1988 175 johnson no ldle & misfiring

Thanks, Will check carbs,have one dripping a little.

Jim

Re: 1988 175 johnson no ldle & misfiring

search for post ...ramblings about carb cleaning ..... its about cleaning carb idle circuits without yanking the carbs.

Re: 1988 175 johnson no ldle & misfiring

jimaret said:

Thanks, Will check carbs,have one dripping a little.

Jim

Click to expand...

Sounds like junk on the float seat, you probably have junk in the other jets.
Get rebuild kits here on iBoats, $22 a pop. You need 6.

It took me under 2 hrs doing it the first time, its simple really.
Watch a video or get the $48 manual.
www.outboardbooks.com

carb video, johnson.
http://www.youtube.com/watch?v=o5cxBMDezuU&feature=related

Re: 1988 175 johnson no ldle & misfiring

Your engine has 3 carbs. You will require 3 carb kits, 439076, usually a stock item at most Bombardier dealers.

Re: 1988 175 johnson no ldle & misfiring

3 carburetors = 3 carburetor kits

Re: 1988 175 johnson no ldle & misfiring

looked at the video ..... you can't get fuel glaze out of the carb just by taking it apart and blowing compressed air thru it ....if the guys afraid of carb cleaner he should leave cleaning carbs to someone else.

Re: 1988 175 johnson no ldle & misfiring

IV is correct. The only way to overhaul carbs is to us some type of carb cleaner that will dissolve varnish residue left from dried fuel. An aerosol type squirted through the various jet passages will quickly give you an idea of how each passage on one carb flows vs the same passage on another carb. You have to take the jets out for visual inspection. That engine has a history of carb leaks due to the black plastic carb bowls. Those bowls don't maintain structural uniformity over the years and all eventually will warp at some time in their life. The warpage gets so bad that just intalling new bowl gaskets will not compensate for the deformity of the the bowls. Not only will the plastic bowls leak fuel between the sealing surface, but they can permit air to leak into the fuel pickup tube area, causing the engine to run lean. I'd replace them with the older aluminum bowls. Bombardier makes a carb bowl replacement kit for these plastic bowls.