Engine cut at 5500-6000 RPM, need help !

Smok3 · Sep 13, 2013

Hi few posts here, my name is Andrew and I am from Romania, I have a Honda ST 1300 (2003)and I have a problem that is beyond me, the engine cut at 5500-6000 rpm.....in neutral,first gear, second gear,and I think all speeds(I tried only the first two).....bike starts OK, works well, Idle OK (900-1000 rpm)....runs fine at 120-130 km/h at 4000-4300 rpm, no problem!!! No ERRORS code ! I discovered this problem when I passed a car in 2rd gear, and then I tried to neutral,first gear, second gear....

I checked:
- All four spark plugs-OK
- I checked and cleaned with contact spray and blow air: TP Sensor conector and all ECM conectors

I need some advice what to check???
Thanks a lot

970mike · Sep 13, 2013

You may want to put some gasoline conditioner in the fuel tank, it could be as simple as some bad fuel.

Smok3 · Sep 13, 2013

I do not think it is bad fuel, this week I did about 2000 km, I`m on vacation and did more several tanks full....

970mike · Sep 13, 2013

I was just throwing out what would be the easiest thing to start with and that would be some bad fuel. You may have a fuel filter problem or a failing fuel pump also.

Mellow · Sep 13, 2013

Passing a car in 2nd gear? You sure you weren't hitting the rev limiter at 7500-8000 instead?

Fueling would be my 1st guess... 2nd might be a clogged vacuum line.

Smok3 · Sep 13, 2013

NO No NO rev limiter, As I said in the first post the engine cut in neutral at 5500-6000rpm,first gear, second gear.... possibly make a movie tomorrow...
Tomorrow we inspect fuel filter ....today I lifted up tank and pulled out the air box for checking and cleaning the TP sensor conector, pls tell more about clogged vacuum line ???

dduelin · Sep 13, 2013

I don't know about the ST1300 but some Honda engines have a low oil pressure sensor that limits rpms if oil pressure falls below or does not attain a preset value. Is there plenty of oil showing in the window?

BakerBoy · Sep 13, 2013

Does it cut out the same when the engine is cold vs. hot?

Smok3 · Sep 13, 2013

well said dduelin but today I did an oil change, new oil and new filter and the problem persists, indeed the oil level was about the minimum

dduelin · Sep 13, 2013

Smok3 said:
NO No NO rev limiter, As I said in the first post the engine cut in neutral at 5500-6000rpm,first gear, second gear.... possibly make a movie tomorrow...
Tomorrow we inspect fuel filter ....today I lifted up tank and pulled out the air box for checking and cleaning the TP sensor conector, pls tell more about clogged vacuum line ???

if you have the air box off look for a black or gray rubber hose leading from each of the intakes. All four connect to a 5 way plastic junction. Sometimes oily goop collects in the 5 way connector and gives a FI light and erratic idle and low speed operation problem. A blockage here does not cut the engine like you describe. Still. It's worth cleaning as long as you are in there under the air box.

Smok3 · Sep 13, 2013

I remember something after the VFR forum, I think I know what you're talking, and noted it and put on the checklist...

Smok3 · Sep 13, 2013

BakerBoy the engine cut in 5500 as like 8000 ....as there would be no spark
In Romania is now night, but tomorrow I'll make a movie

Mellow · Sep 13, 2013

I wonder if you have one of the coils going out or have a loose wire on one and the vibration at that rpm is causing issues.

Smok3 · Sep 13, 2013

Coils are not checked, only the spak plugs....and noted that, thanks

Smok3 · Sep 13, 2013

Ok now I have a problem with neighbors

even if it is a late hour I made a movie, may be easier to understand what I mean....ABS light comes on when put in 1st gear and accelerate, bike is on centerstand
PS : I apologize for the quality of the film, but is made on the run....problems with neighbors

I am still waiting for suggestions for what to check tomorrow
http://www.youtube.com/watch?v=ILeiED0loYg&feature=youtu.be

Mellow · Sep 13, 2013

Might be a fuel pump that can't satisfy the demand after a certain point.

RandyIdaho · Sep 13, 2013

I'm betting on something electrical. Fuel demand at 5500 in neutral, or in gear but no power to ground, is going to be relatively low. If it will pull hard at 4000 rpm (like up a steep hill, or pretty hard acceleration) and not miss/stumble at all, I don't think a fuel supply problem is likely. Probably not a faulty injector or injectors as it seems to run fine at lower rpm under any load condition. Only way to tell would be a pressure gauge installed on the fuel rail. I'm not sure how the FI program is set up in the ST1300, but if it has a mode change at around that rpm, that would be a key thing to look at.

I will look in the troubleshooting in the service manual this evening and see if I can come up with anything else.

Smok3 · Sep 13, 2013

Thanks a lot RandyIdaho, expect an answer from you

Justytroll · Sep 13, 2013

RandyIdaho said:
I'm betting on something electrical. Fuel demand at 5500 in neutral, or in gear but no power to ground, is going to be relatively low. If it will pull hard at 4000 rpm (like up a steep hill, or pretty hard acceleration) and not miss/stumble at all, I don't think a fuel supply problem is likely. Probably not a faulty injector or injectors as it seems to run fine at lower rpm under any load condition. Only way to tell would be a pressure gauge installed on the fuel rail. I'm not sure how the FI program is set up in the ST1300, but if it has a mode change at around that rpm, that would be a key thing to look at.

I will look in the troubleshooting in the service manual this evening and see if I can come up with anything else.

Maybe the rev limiter itself has an issue. I assume it's a sensor the feeds the ECU. if it was only one coil or one spark plug it would start missing but not cut out. Interesting challenge.

Smok3 · Sep 14, 2013

NOT a challenge trust me

is a stress I do not know what is and where to look

Engine cut at 5500-6000 RPM, need help !

Smok3

970mike

Mike Brown

Smok3

970mike

Mike Brown

Mellow

Joe

Smok3

dduelin

Tune my heart to sing Thy grace

BakerBoy

It's all small stuff.

Smok3

dduelin

Tune my heart to sing Thy grace

Smok3

Smok3

Mellow

Joe

Smok3

Smok3

Mellow

Joe

RandyIdaho

Smok3

Justytroll

Smok3