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Engine starts ok but after short time runs slow and rich.

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Susan, sounds like there may be several issues needing to be looked at on this mower. It may need a tuneup,(replace spark plug, air filter, oil, sharpen blade), you may have some blockage in the carburetor. If it has not had alot done to it in the past, I would check the air filter. It may be long over due to be replaced.

Posted on Oct 07, 2009

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Turns over slow, backfires , then starts.replaced battery, starter is ok. replaced plugs. what else?


If the unit runs normally after it starts it is probably a defective coil that isnt changing timing relative to crank speed. It is running advanced even at slow speeds and that is the backfire. You could also have a slightly bent flywheel key. This is what sets the primary timing so it is always a good idea to check it when you have the engine cover off!

Jan 25, 2013 | kawasaki Garden

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Poor acceleration and low gas mileage,smells rich at idle


You are off to a good start, MAF when it is contaminated it leans the vehicle out it doesnt make the car run rich, depending on the fuel strategy of the year make and model,and of course the engine size make all the difference,bad ignition coil make a car run rich shorted 02 sensor that lean bias make the car run rich, worn timing belt ****** timing and causes the car to run rich.so lets hear the results

Mar 24, 2012 | Cars & Trucks

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1999 lexus rx300 4wd eng. light comes on, no power, rough idle hesitation cat converter cherry red. when computer reset runs ok for short time


Converter is ruined, as are the O2 Sensors

Now you have to fine out why

Rich Condition or Overheating,
Engine Misfires

Have fun !!

Feb 16, 2011 | 1999 Lexus RX 300

1 Answer

Engine starts fine but lacks power until it warms up for 2 to 5 minutes. Carb is ok, replaced head gasket. Just started doing this


If it starts at completely cold to fine tune the high jet adjustment.first off the high speed jet should be initially set at 1 1/2 turns out from lightly bottomed all the way in. next when you do your prestart routine,choke all the way on,primer pumped two times,throttle set at the high speed position,ignition key on,fuel line turned on.(this is my prestartup for my 8hp tecumseh)yours may be slightly different.use whatever starts your machine the easiest! once my machine starts up i can almost immediately turn the choke completely off. i can do that because the high speed jet is opened enough or rich enough for the engine to run.if you adjust the high speed in it will lean the motor out(you found that to be true!) to where it will miss and backfire and eventually quit. start at 1 1/2 turns out and start the engine,once the engine starts if you take the choke off right away use what it does as a guide to high speed adjustment. if the engine quits turn the screw out 1/4 turn and so on.use the very first cold startup as the test for high speed mixture adjustment. at completely cold startup you have the jet adjusted correctly when the engine will sustain itself when you completely take the choke off very shortly after startup. let the amount of choke you need at cold start to keep the engine running be your guide.too lean and the engine will not stay running without the choke at all,too rich and the engine will not pull under extreme loads and will show signs of black soot out the exhaust. you want the jet adjusted so within 5 seconds of cold start the engine will stay running with no choke at all. find that needle setting ( don't ad any more!! ) and you'll be good to go.keep in mind the above is not optimum and is a little rich but you will like the way it starts,stays running,and overall performs as adjusted above.

Oct 03, 2010 | Tecumseh 5hp Engine Snow King Mtd Blowers...

1 Answer

Leaf blower starts and runns ok for few mins then


Target your inspection towards the 'spark arrestor screen' in the outlet of the muffler.

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Nov 13, 2009 | Craftsman Garden

1 Answer

My yamaha yz 250 ruins spark plugs in about 5 min , why


first determine condition of cylinder by a compression test. if compression is ok, you are either running too rich of a fuel/oil mixture, slow running or idling too much, "2 strokes are not meant to idle very much without "cleaning out" or revving the engine to rid itself of carbon buildup from excessive oil burn. you may also want to try running a hotter plug. go up one heat range ,"down in number" at a time. if your not familiar with doing this, ou could overheat your engine. so be careful!

Oct 25, 2009 | 2005 Suzuki RM-Z 450

3 Answers

Troubleshooting fuel system for 1975 jeep cj5


Fuel pumps just supply fuel to the carb. Either they work or don't work. I would make sure that the mixture screws on the carb are set properly. Turn the screws in to lean out the mixture, do one at a time.
You want to turn the screws in to the point where the jeep will start to idle rough and then back out a 1/2 turn. Check your timing also. If the jeep has alot of miles on it, the timing chain will stretch and it's possible that you cannot get the correct timing.

Dec 30, 2008 | 1983 Jeep CJ5

1 Answer

Slow start - need to sit for a while - then starts fine.


Hey, 2 words.....Voltage Regulator! i had this problem and before you spend too much, check and make sure that your fan is grounded b/c most must be and then try an actual Diagnosas check normally around $80 but is does pin point whats wrong. Either Voltage regulator or you have a short.

Dec 26, 2008 | 1996 Ford Taurus

1 Answer

1997 Ford Explorer


Ok you need to correct the mechanical issue and then deal with the codes, they are a result of the engine problem, not the cause of it.

Oct 14, 2008 | 1997 Ford Explorer AWD

1 Answer

High geared chainsaw


Hi 1tgriffin,
My name is Dennis and I hope that will serve your needs.
IDLE ADJUSTMENTS:
There are three adjustment screws on the carburetor labeled
H (for High speed MIXTURE)
L (for low speed MIXTURE)
T (for idle SPEED SETTING)
They are located just above the primer bulb. If your saw floods so soon in the starting process the idle mixture setting can be set too rich and the speed may be set too slow. Remember the chain will not move when the idle speed is set correctly with a WARM ENGINE!
Adjust the idle speed to just below chain movement WITH A WARM ENGINE this is just below the activation RPM of the centrifugal clutch. Let the engine run at a higher speed than idle until it is warm -- 3 min -- you may have to keep goosing it until then.
Please don't exceed the limits of the plastic limiters when making adjustments.
If you haven't adjusted the mixture screws you may just have to adjust the idle speed and that can start my turning that screw all the way in to the stop and then back out 4-1/2 turns for a good place to start. FAST IDLE -- Adjust the speed until the engine runs with out the chain moving. Adjust clockwise to increase speed. C clockwise to decrease engine speed.
Accelerate the engine and if it stumbles and makes too much smoke it's too rich turn the
LOW SPEED MIXTURE (in) clockwise in 1/16 a turn increments NO MORE at a time because a two cycle needs to run at a setting for a short time to really prove the setting. don’t run it wide open to warm it up but it should be at a fast idle. Nothing you do will be proven correct until the engine is warm.
Good Luck
Glad to be of assistance - please rate the solution because I will learn from your rating. Thank you

Sep 02, 2008 | Poulan Garden

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