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After starting the motor hunts for fuel causing the revs to fluctuate

Just checked the fuel supply

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What engine or vehicle does it have a throttle position sensor?

Posted on Dec 15, 2014

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My motor mower speed fluctuates - the engine revs fluctuate from just above idle to full revs


You're sucking in air through a gasket, you have dirt in the fuel or fuel filter and possibly a broken spring on the air/fuel mix flap on the carburettor!

Jan 31, 2017 | Miscellaneous

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I have a 1996 Dodge Magnum that fluctuates from 900 to 500 ppm and eventually die


on fuel injected engines this can be caused by the stepping motor which controls low speed engine revs, they need rewiring if faulty, if it's a carby engine it could be a blocked air filter, or dirt blocking a jet in the carby. the fuel tank pick up may be broken, or the fuel pump valves could be faulty. check for a good vacuum on the inlet side of the pump to see if the valve is ok. have you got gas in the tank ?

Jun 20, 2014 | Cars & Trucks

1 Answer

My kawasaki 23 hp model # fr691v on a toro 50 inch ztr from home depot started back firing. there was dirt in fuel filter so I changed it. changed the plugs and new air filter. Cleaned the carb. now thw...


hi there

if you had the carby off and cleaned it out , was the fuel flow from tank to fuel pump ( if it has one ) good , and was the output from pump to carb good on cranking?

if so and the breather in cap is venting , it could be that the governor needs adjusting, possibly have got a spring in the incorrect position and there is no binding , pay to check , carby main jet closly for any obstruction. check the fuel level and float hieght .

most times hunt / surge is caused by obstruction to fuel flow , or governor

try holding the governor in a fixed position if hunt / surge still apparent - carby is causing fault
but if not governor setup is causing problem

cheers pauly46

May 28, 2011 | kawasaki Fh680vgs24 23hp 23 Hp Lawn Mower...

1 Answer

I have a 1991 ford explorer 4.0L Eddie Bauer edition. The idle revs to 2000 rpm's and then will drop to no less then 1200 rpm's. If I give it the gas it dies whether I'm in gear or not but when I...


There are several problems and they are all related. Check plugs if they a white with gray ash buildup. Gap .054

1. Fuel pressure regulator, if it is ruptured fuel will be vacuumed straight into the the intake causing idle surge also in causes temperature fluctuation and poor performance. It will also cause lean running condition.
2. The Mass Airflow Sensor also has a huge impact on mixture, defective symptom was a knocking and clattering under load especially uphill. Cleaning will only give temporary fix.
3. Spark Plugs- Do not use Platinum plugs they run hotter than standard plugs!
4. Any intermittent starting problems are likely fuel pump related, when you turn the key in the ignition you should hear the pump running!!
5. Preventive maintenance is the key change your fuel filter at recommended intervals.

I have a 94 Explorer, it run very poorly after changing these items it runs great, restored power, idles great and great mileage again and finally no more temperature fluctuation.

Nov 05, 2010 | 1991 Ford Explorer

1 Answer

Have 24 hp kaw. engine on Cub lawn mower. At idle, engine is erratic, revs, then slows, revs, then slows.


Hello. The usual cause of carb "hunting", is a weak governer spring. Although it might look fine it may not be and I would replace it. Another possible cause is a float problem. Finally it could also be the fuel filter or a chunk of debris in the carburator.

Jun 08, 2010 | kawasaki Fh680vgs24 23hp 23 Hp Lawn Mower...

1 Answer

HONDA FIREBLADE RRV. REVS FLUCTUATE


Dyno kit supplies you extra carb needles which are useless in street use.They are only for racing use.If the previous owner installed them then you should put the stock ones back.Also reset your carbs (vacuum pressure, mixture screws)

May 27, 2009 | 1997 Honda CBR 900 RR Fireblade

4 Answers

At idle the engine revs up and down


engine lite on? would ck to make sure there is plenty of coolant in system. low coolant may cause idle hunting. also could have a vacuum leak or air intake restriction. ck air filter

Nov 30, 2008 | 2000 Volvo V70

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