When does a Harley Davidson engine misfire at low speeds?

However, when cruising along about 25-30 mph (in either 2nd or 3rd gear) it is always misfiring and sputtering pretty bad now (had a little hint originally and definitely getting worse now). After coming to a stop, the idle is a bit rough and sometimes the engine acts like it wants to cut out for a few seconds after which it seems to idle OK.

Why does my car not accelerate over 40 mph?

My car won’t accelerate over 40 mph and the check engine light is on My car has 152000 miles. My car has an automatic transmission. Hi there. In many cases, when you have an issue with the car accelerating and the check engine light comes on, it’s caused by a mechanical problem with either a drive-system, fuel or ignition system component.

Why does my car stall at high speed?

The engine can stall at high speed, at low speed, or even at idle. A faulty throttle position sensor will not let your car accelerate normally. Though this doesn’t happen all the time. You may experience slow acceleration, acceleration surge at both high and low speeds, hesitation or delay in acceleration, and other related symptoms.

What happens when your car’s engine is misfiring?

Whatever the cause, if your car’s engine is misfiring or surging, it will prompt error codes to appear in your OBD-II Diagnostics system. These codes can cause you to fail your local vehicle inspection, or at the very least can result in that alarming orange glow to appear on your dashboard: the Check Engine Light.

What kind of car won’t accelerate over 40 mph?

My car won’t accelerate over 40 mph and check engine ligh… My car won’t accelerate over 40 mph and the check engine light is on My car has 152000 miles. My car has an automatic transmission. Hi there.

Why does my car not go past 30 miles per hour?

This can be due to a clogged catalytic converter, failing transmission, limp mode, loss of power such as failing alternator, severe misfire, and very low transmission fluid. A clogged catalytic converter can prevent the vehicle to not pass a certain speed.

What to do if your engine misfires at low speeds?

May want to try this. Get the tank fuel level to about 1 gallon so the holes (if any) will be above the gas level. Remove the fuel pump relay and jumper pin 87 to pin 30 (look at relay bottom) at the harness socket. Leave relay removed. With the engine off, turn ignition to on. The pump will run continuous and not just for a 2 second prime.

What happens when a Mercedes engine misfire occurs?

As soon as an engine misfire occurs on a Mercedes-Benz, you will notice poor engine performance and strange vibrations that in some cases can be felt even in the driver cabin. The first thing that comes to mind when you get an engine misfire is: “This is going to be expensive.” Take a deep breath because in most cases it doesn’t have to be.

What causes a motorcycle exhaust pipe to backfire?

Running rich not only drastically decreases your miles per gallon, but can cause severe backfires in the exhaust pipe.

Why does my misfire make noise above 3000 rpm?

Take a look at your timing at or above 3000 rpm, if the timing is bouncing all around then it’s definitely noise, if it’s not though I really don’t think it’s going to be in the ignition. You said you’ve changed a few things in the ignition and still no difference, I don’t think it’s the ignition.

What to do if your car misfires at 3000 rpm?

If you have any electrical component like an electric fan or water pump try to shut these items down for testing purposes and see if it clears up. Try reducing the plug gap by .005 increments and see if it improves. These items can cause the engine to miss at higher RPM’s.

Can a MSD unit misfire above 3000rpm?

Check voltage at higher RPM’s it should maintain above 10 Volts, if voltage is falling too much this can cause a miss. The wires that go from the MSD unit to the distributor, make sure these wires are not close to any other power wires, try to isolate these wires away from any other power wire or spark plug wires.

Can a Harley Davidson run at low speeds?

However, since I bought it the engine is not running well at low speeds. It basically runs fine under mild/strong acceleration or at full highway speed and seems to idle normally when the bike is started.

When did my Wife’s Harley start to misfire?

My wife’s 2005 FLHTCUSE2 began to develop problems a few weeks ago. After a short ride, we stopped for her to get gas. On the way home, her Harley started to misfire and run poorly. I lost sight of her so I pulled over. After about 15 mins she showed up and said her bike would not stay running.

Why does my Harley Davidson engine pop when I idle?

After coming to a stop, the idle is a bit rough and sometimes the engine acts like it wants to cut out for a few seconds after which it seems to idle OK. The popping/backfire also continues about the same on decel as when I got it.

Why does my Harley Davidson sputter at cruising speeds?

In other words, it just pushes into a seal instead of bolting on like the older carbs did. This means that the carb has to be aligned correctly or an air leak can occur around the seal. The air filter assembly is what holds the carb. into the seal and aligns the carb.

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