Question about Troy Bilt 5.5hp Self Propelled Mower

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Engine does not idle well. always surging.

Engine starts okay but seems to want to surge up and down with no constant idle.

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  • nwpolischuk Jun 04, 2009

    Thanks for the quick response. This unit does not have a plastic carb. It is an alloy. The gas tank is seperate. This unit has a gas bowl with a float and has a primer on it. It seems to run really well if you keep the primer pressed in. dont know why this is so. I have lots of gas flow to carb. there are no external adjustments that could be made to the carb. I dont think there is a screen restricting flow through a nozzle. this is a 6.9 HP Troy built. Any ideas?
    Thanks again for the help.

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The nozzle is clogged.if this is a briggs engine it has a plastic carbuator on it.to clean you need to remove the gas tank and carbuator,that the screws out that hold the carb. to gas tank.inside you will find a screen covering the nozzle,carefully using a very small screw driver pop the nozzle from the carbuator.there is an o-ring holding it in.don't lose it.gently blow air both directions through the carb.replace it and start the mower up,surge should be gone now.hope this could help,if not let me know and we can try something else........................

Posted on Jun 03, 2009

  • steve
    steve Jun 06, 2009

    okay,on the side of the carb. there is a screw that looks like an adjuster screw.this is another type of nozzle.carefully remove it.it might be under a plastic cap.once you remove it you need to clean the tiny,and i do mean tiny hole in the end of it.i use a piece of piano wire to reopen thes hole.the wire size i use is 0.010".if you use anything bigger it will get stuck.the nozzle is made of brass.once you get the wire through the hole.run it back and forth so the hole is opened.once you clean this hole,thake an air nozzle and blow through it to get all the dirt and brass chips out of it.reinstall it and starte the motor again.should be no throbe at all.hpe this helped just let me know......

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1 Answer

2000 Suzuki Esteem 1.8L.. I went to start my motor & turned it off right before started. I heard some kind of backfire. Then I started it and it's been idling high, the surging. Please help!!


scan it yet, a FULL OBD2 scan? why not?if not.
now is the time...


the 1.8L J18 engine, same as the older Sidekick sports used.
same engine , know it I do.
its the precursor to the J20, (j18 is under-stroked, j20 with many of the same parts. inside)
the back fire means explosion sound to rear end of tail pipe?
yes, that is rich raw fuel in the muffler. plus Air.
if there are exhaust cracks and then engine goes rich this can happen( a double failure)
if how ever BACK means, back to the Air cleaner, then that be different reasons, (timing)


engine now starts.?>
engine runs.? has full power, car drives ok.?
JUST?
SURGE,. you never said.

does engine get hot? 180F or more and holds (y/n)
ever get a full tuneup this decade,
most dont so i tell you, bad spark causes, misfire and raw fuel is wasted to the exhaust and sure can go boom.

surging usually means the ISC can not control idle
so it hunts, (a suzuki software engine on all 90s engines)
PCM errors, inside it. (dangerous too)
a modern car, if idle goes too high the ecu commands the ISC closed
and holds it there solid, (safe way , no hunting allowed now)]
so if this car surges, it's , lean engine.

some think flooding is surging.
and this is usually below 800 rpm,
almost stalls, then corrects, seems like a surge.

next time post rpm range of surge.?????

do not drive a surging engine, do not be like Toyota drivers. (over 800 rpm hot)

surge from 400 -800 rpm is class 1 surge.
surge from 800 to say 2000 RPM is class2, and very dangerous to some folks, (key off, get car fixed, tow it)

The ECU controls idle speeds. (hard coded servo controls)

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