Question about 2000 Harley Davidson FXSTS Springer Softail

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My bike runs rough idleing and at slow speeds. It

My bike runs rough idleing and at slow speeds. It also is jerking at slow speeds. At full throttle it seems to run fine.

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Check for intake leaks where the carburetor manufolds connect to the heads, when it is running at idle dpray WD40 around the area if the idle increases there is a intake leak.
reolace the gasket/gaskets,and since the carb will be off clean it or have a mechanic do it.

Posted on May 16, 2010

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Posted on Jan 02, 2017

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The AC system requires horsepower so it may cause a jerk if the following is present, the idle speed control system is fouled up with gunk and slow to respond to the load change. I suggest you clean the idle speed control valve and the throttle valve with spray throttle valve cleaner and see if that helps.

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'87 Yamaha ProV 50: Will cold start and idle well. After a full throttle 1-2 min run will begin & continue running very rough near idle. Will die without addtl throttle imput.


Hi Roderick:
I'm not familiar with your engine configuration, but on some of the older bikes, vibration eventually can cause a wire to break in the coil. When the engine is cold, the wires make contact and it runs, but as soon as it gets hot, the connection is broken or compromised and the spark quits or drives you crazy.
Since your bike runs when cold and quits when hot, I'd be looking for electrical rather than fuel problems.
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1 Answer

When idleing once in a while it starts running rough and shaking truck, 1998 k1500 350. no engine light. when i gige it gas it smooths right out. engine seems like its a little louder than normal.


Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

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3 Answers

2002 Honda VTX 1800C. Idle Problem


sound like you just running low on fuel you probably dont have a problem at all don't let you fuel level run so low if it does that turn your fuel petcock to reserve and head for the nearest gas station.

May 03, 2010 | 2004 Honda VTX 1800

1 Answer

I have a 1999 honda valkyrie interstate. it is idling and throttling rough. with the choke engaged at startup it will only idle at about 1100 rpm. when i throttle up it it just doesnt feel like it should....


I would change the plugs and the air filter. Also I would put a full can of Techron or Seafoam in the gas tank and ride it to see if it clears up. If these bikes sit very long the slow jets in the carbs can partially or fully clog resulting in rough running. If the bike sits for long periods over 2 months I would also use a fuel stabilizer such as Seafoam or Stabil. Make sure when adding a fuel stabilizer that the bike runs long enough to get the additive in the carbs.

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1 Answer

Rpms Too Low


the idle speed is controlled through the on board fuel injection control module (known as the PCM), even if u raise the idle at the throttle body the computer will slow it back down, however there is a problem that causes slow idle, do the following procedure to correct the slow idle issue, follow it exactly.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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1 Answer

2002 Honda Accord - slow engine start and jerking


Most likely a dirty idle speed control system follow the guidelines below to clean it.

Throttle Body Cleaning on vehicles without electronic throttle control (most 2003 and down)

You can in most cases repair this slow speed stall or unstable idle by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.

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1 Answer

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sounds like u need to do a tune up on it. clean the carb, new plug

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Had same problem: cutting out at low rpm, jerking, a huge clunk or shudder at higher speed (like transmission was going out), and rough idle. All these symptoms were intermittent.

CHECK THE FUEL FILTER!! Changed the fuel filter and thing runs fine!!

PS mine 2003 expedition has 105k

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