Engine sputtering and backfiring

[grampi]

The ignition is fully electronic, so if the ignition timing is out of whack there would be something seriously wrong. If the cam timing is out by much the engine will likely not run at all and things will be severely broken inside.

You say none of the throttle bodies have capped vacuum ports, are they open into the throttle bore?

All 3 throttle bodies have 2 vacuum lines each, and the other end of all 6 of those lines connect to something like junctions under the tank. None of the TBs have a plug or an opening into the bore.

Isn't engine timing changed by the map?

 

[ruzzle]

Very few maps fiddle with ignition timing. Tis a very dangerous area!!

 

[grampi]

Very few maps fiddle with ignition timing. Tis a very dangerous area!!

That rules out timing then, but it could still be a problem with the map in the form of a bad A/F ratio, correct?

 

[Loonitick]

Might be worth checking that the connectors to the coils are properly fastened and the wires aren't damaged.

 

[TURBO200R4]

All 3 throttle bodies have 2 vacuum lines each, and the other end of all 6 of those lines connect to something like junctions under the tank. None of the TBs have a plug or an opening into the bore.

Isn't engine timing changed by the map?

THE MAP sensor TAkes info and relays it to the ecu and the ecu regulates timing and a/f.
it might be interesting to disconnect the map sensor (electric connector) to see how it runs. it might take a little while before it idles good.

 

[grampi]

Might be worth checking that the connectors to the coils are properly fastened and the wires aren't damaged.

I did that on #s 2 and 3, but I couldn't get to the connectors on #1...on the ones I could check everything looked good.

 

[TURBO200R4]

if u want to mess with your rocket u can buy a vacuum checker (vacuum pump) plug all of the vacuum but one and see if u can draw a vacuum on the map sensor u can use the little surgical pliers to clam off any that u think have vacuum leaks. if your vacuum hoses are good u should be able to draw at least 15 inches of vacuum.
by temporary disconnecting the map sensor the ecu will substitute its on info. i do this to determine if the sensor is bad. of coarse if u have a broken hose it WILL make the map sensor relay the wrong info to the ecu. hth
i will be gone till monday good luck on your problem.

 

[grampi]

THE MAP sensor TAkes info and relays it to the ecu and the ecu regulates timing and a/f.
it might be interesting to disconnect the map sensor (electric connector) to see how it runs. it might take a little while before it idles good.

Got a pic of where the connector is located? I have no idea which one it is...

 

[grampi]

if u want to mess with your rocket u can buy a vacuum checker (vacuum pump) plug all of the vacuum but one and see if u can draw a vacuum on the map sensor u can use the little surgical pliers to clam off any that u think have vacuum leaks. if your vacuum hoses are good u should be able to draw at least 15 inches of vacuum.
by temporary disconnecting the map sensor the ecu will substitute its on info. i do this to determine if the sensor is bad. of coarse if u have a broken hose it WILL make the map sensor relay the wrong info to the ecu. hth
i will be gone till monday good luck on your problem.

I would guess the chances of any of the vacuum lines having a leak are next to nothing...this bike's only 2 years old...I could disconnect the map sensor (if I know which connector it is), but the rest of that stuff is beyond my skill level...

 

[TURBO200R4]

I would guess the chances of any of the vacuum lines having a leak are next to nothing...this bike's only 2 years old...I could disconnect the map sensor (if I know which connector it is), but the rest of that stuff is beyond my skill level...

I would say that it is a good chance that one of the hoses is off because when the engine backfires there is a lot of pressure on those hoses its not uncommon for them to pop off.
(on cars that backfire)
i am not familiar with the 6 hoses it only takes one off to cause a problem. somewhere at the end of those hoses is the map sensor thats all i know.