For starters, here's what has already been done. I have replaced coilpacks, plugs, all fluids, fuel, had the throttle bodies calibrated at dealership. Now, my bike hesitates horribly when I open the throttle. and it got warm the other day (over 220) and would accelerate at all. With the clutch in it seems to rev freely, but lugs under any load. It doesn't smoke so I don't think there is any problem internally (i.e. piston rings, etc.)
An expert who has achieved level 3 by getting 1000 points
An expert that got 20 achievements.
An expert that got 10 achievements.
An expert that got 5 achievements.
Re: Engine lugs when the throttle is opened
Sounds a lot like you are running lean... running hot, stumbles when you roll the throttle on. For starters,
has it always been this way for you or is something that has just started happening
have you changed any parts... air filters, exhaust
when did you last run some injector cleaner additive through the bike.
These bikes are setup to run somewhat lean to begin with from factory to comply with emission control standards.
Be careful if it is running hot ... if it is leaning out for some reason(will cause it to overheat also), you can destroy the engine, blow holes in pistons, burn valves... all manner of things. If you have changed any intake/exhaust parts, then you may need to have the fuel injection re calibrated to pick up on the extra flow/performance these parts provide. Altering anything in this manner will impact the fuel mix/tuning of the bike.
I would suggest running a cleaner through the system initially. Gummed up injectors will cause it to run lean for sure.
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones). click here to download the app (for users in the US for now) and get all the help you need. Good luck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Did you check fuel pressure ? Are there any lights lit on the dash , SECURITY . Does it have a good blue spark at plug wire end ? Spray some carburetor cleaner or starting fluid in to the throttle plate , hold it open an spray it in ! If it starts an runs you have a fuel problem , Is it losing spark ? crank sensor problem ? Rather then just replacing parts you should have taken it to a ASE certified repair shop , would have cost less then what you have already spent !
If it is idling like it was before the inj were replaced then you have fixed the wrong problem the ethonol doesn't damage injectors you probably have a spark plug wire that is bad or a coilpack is bad or you have a fouled spark plug? A compression test can tell you of any problems with the valves! The injectors are designed to be compatible with flamible liquids ie gasoline or alcohol! I have been a mechanic for 23 years and have never seen inj fail due to alcohol in today's gasolines! You might have been scammed? Anytime you have repairs done request your old parts to be returned to you! You might have to take the mechanic who claimed he replaced your inj to small claims court! Try replacing the plug wires and the spark plugs first if no change then get carburetor cleaner and with the engine running spray the inside of the throttle body where it is black with the throttle open and engine rpms increased if that doesn't change it the coil packs might be going bad there are three so buy all three as a set so you don't have to change them at different intervals! Depending on mileage the timing belt is reccommended to be changed at 150,000 miles the spark plugs are due at 100,000 the coil packs should last over 200,000 miles so I'm guessing it is time for major preventative maintenance? The timing belt being worn can cause rough idle too!
If it's a gasoline engine, please check for sparks at the spark plug end. If it's a diesel, check pre-heating system. Starter fluid in the throttle body must be ignited by the spark plugs. For diesel, pre-heating is necessary to ignite the fuel.
Check the filter, as it may be clogged and due for replacement. To test for fuel delivery, open your airbox and spray some starter fluid (purified ether, usually) down into the throttle body while someone else cranks the engine. If it fires up and runs for a few seconds but won't run without spraying the starter fluid, then you know you've got spark and compression. If that's the case, there could be any number of potential issues: throttle position sensor (not very common, but it does happen), fuel injectors clogged (common if you use low-grade fuel), fuel filter/strainer clogged (filters should be replaced every 30k miles or so, on average), fuel pump failure (you should hear a buzzing from the fuel pump when you crank the engine).
If the starter fluid doesn't help, then the problem is no spark. Check each plug/cable for fouling.
To test fuel flow, have a 2nd person stand over air filter (air filter housing open) with a can of starting fluid in one hand. Don't give any throttle, then 2nd person gives 1-second squirt into air filter while you're turning starter motor (no throttle). When engine catches, immediately give one third to one half throttle. Just before it dies, 2nd person should give another short squirt of starting fluid to keep engine from dying. If throttle won't keep engine running and only starting fluid keeps it running, then yes, no fuel is going through fuel lines. Either its a fuel pump issue or maybe there's restriction because of clogged dirty fuel filter. If it starts but runs rough and has black exhaust smoke, then its clogged or dirty fuel injectors.
Have a helper crank it while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure? What is the fuel pressure spec? Any applicable trouble codes? You may need to check cylinder compression?
Have you tried starter fluid? There are safety issues using any type of flammable spray. Safety is your responsibility. Some people use a little propane. I take air duct loose from throttle body, open throttle valve, spray just a little. If the engine tries to hit off the spray, it's a fuel issue in my opinion. Don't spray on any sensors.
Fuel injectors go bad on these engines, you can find re manned ones for 30 bucks. If you have an engine light on get that read. Change your coil/wires/plugs also. Is the lower intake manifold gasket leaking coolant yet? You may want to get that replaced also. Check the TPS too (throttle positioning sensor) those will also cause your engine to act up
I would rplace your spark plugs and wires,clean the throttle plate and body,run fuel injector cleaner thru the tank or have a top engine cleaning done,replace your trans filter and have it flushed ,replace thermostat and have the cooling system flushed,replace front and rear differental fluids as well as transfer case fluid.It would also benefit you to replace your brake fluid,also your fuel and air filters