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When motor is at idle speed it surges

When motor is running at idle speed it surges up and down but when i pull the trigger on the wand it runs smooth

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  • Anonymous Jan 10, 2009

    the coil on the washer will not fully release to start the motor.

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Try a simple test. It is ok to run the pump without water for a short time. Check idle speed without water in system to see if enginet surges. If it does not surge, then most likely the unloader/ pressure valve is causing the engine to surge when in the unloaded state. Life of unloader /pressure valve is shortened by letting system bypass for long periods of time. Enjoy

Posted on Dec 02, 2008

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Trigger for wand needs replacing, water bypassing it and not allowing pressure build up enough to close pressure switch, allowing engine to go back in idle

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Starts fine I changed the oilfilter,fuelfilter, spark plug and air filter .my problem is .The motor when in a lower speed than fast the motor surges up and down not running smooth .


Your carburetor and its jets need a thorough cleaning to restore proper operation. The idle circuit is the culprit in your case.

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Why does my pressure surge


Common problem across brands. When you spray water the drop in pressure triggers the motor to take the hose pressure ~ 30 psi and boost it to ~ 3000 psi. Water coats these parts with calcium (hard water) or other junk and water contains bacteria which causes slime and scale. Once that pressure switch / valve is sufficiently clogged it doesn't move smoothly so it can fluctuate between sending a yes / no signal about whether you are squeezing the trigger or not. This causes the pulsing.

EZ test: take the the tip off the wand, start the unit, squeeze trigger - should run continously with no problem. If it does for sure you need to watch a video on dissembling and cleaning the valve body. It is not hard but you must work carefully to avoid losing parts especially springs and take digital pictures to record the order for reassembly.

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I have a series 51 husky saw. it starts and runs normally until it gets up to operating temps. then it stalls out and either refuses to restart or just won't restart until it cools down again....


sounds like air fuel mixture screws are out of adjustment..start with the on marked (L)..this is the low speed(idle) adjustment...turn it in all the way just until it stops..but be gentle..then you wnat to turn it out 1 1/2 turns as a starting point..start the engine and adjust it until you get a smooth idle...next, with the saw running, pull the trigger and you should have a smooth response from slow to fast...you can adjust the (H) screw until you get good high speed operation...if these adjustments don't fix the problem thenm yoou may need to have the carb rebuilt( a carb kit is usually only 15-30 dollars)

May 09, 2011 | Husqvarna Garden

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Got a 99 Nissan Altima 2.4, t-chain broke... replaced head and all t-components... start up surging idle and whistling off idle... engine runs smooth and great power off idle


the surging and whistling sounds like there might be a vacuum leak that is causing this.recheck all vacuum lines and surfaces were this is a gasket that seals a vacuum source.smooth running and good power off idle suggest this leak only affects the motor at a low(idle)rpm.

Apr 14, 2011 | 2005 Nissan Altima

1 Answer

Toro snowblower///// tecumseh# on motor is H35-45598R SER 5283B


Usually that is a sign of the carb not being adjusted right. Run it at full throttle and adjust the main mixture needle (usually on the bottom) until it runs the smoothest. Set it in the middle of the range where it runs smooth. Then set it down to idle and adjust the idle mixture until it runs smooth at idle. Accelerate it rapidly and if it bogs or hesitates turn the idle mixture a little leaner (clockwise) and try again until it works right. That should get you very close. Try tweaking it a bit from there. as the microscopic specks clean out of it, it may need more adjusting.

Nov 25, 2009 | Garden

1 Answer

2002 suzuki LS 650 running lean at higher speeds, (off idle)


this prob happens allways in carburated engines that the car or motorcycle is running lean or rich . because the air - fuel mixture ratio is not right . so you should open the carburator and remove the air filter you will find two screws in the lower front section of your caeburator. you can adjust them by a screw driver until your car is smooth

May 31, 2009 | 1996 Suzuki LS 650 Savage

1 Answer

1997 Nissan Hardbody has rough idle/surges/stalls


the 2001 altima is what i have and I had the same problem as you. turned out to be a bad head gasket factory used cheap ones for a few years before they found the problem. one way to test this is to get a can of carborator cleaner and spray it around the area where the head meets the block under the intake problem should be around the 4th cylinder or close to driver side. if the head gasket is bad the rough idle will smooth out while you are spraying the head.

Apr 16, 2009 | 2001 Nissan Altima

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