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-   RC Nitro Stadium Trucks (https://www.rcuniverse.com/forum/rc-nitro-stadium-trucks-243/)
-   -   nitro problem NEED HELP! (https://www.rcuniverse.com/forum/rc-nitro-stadium-trucks-243/10161648-nitro-problem-need-help.html)

rc awesome 11-26-2010 08:57 PM
nitro problem NEED HELP!
 
hi everybody!

About a month ago i bought a traxxas nitro sport. The thing has run good for a while, and then every thing goes south. The truck will stall if a give it WOT, sometimes slowly and sometimes quickly. I thought that it was acting like it was too lean so i richend it some. it still doesn't run right nomater which way i turn the needle. if i turn it to factory specs it will run better but not like it should. not to mention the rubber exhaust connecter continues to fallofwhile i'm running it. I checked for air leaks there are none in the motor or the gas tank.Idoesn't matter if i change the glow plug orclean the air filter, it still won't run. This thing is awesome when it runs and im trying not tolose my patience. I spent alot of money on this thing, and i was expecting a little more out ofit.This is my first nitro, so most of myknowlege comes from the internet, so i don't really know what's wrongwith the truck. I did the break in right, and i've only run a gallon through it so i don't think that i need a new motor. This is REALLY frustrating please tell me what it wrong.The engine is a pro.15.
Thanks.

charlie_diesel 11-27-2010 05:59 AM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome

hi everybody!

About a month ago i bought a traxxas nitro sport. The thing has run good for a while, and then every thing goes south. The truck will stall if a give it WOT, sometimes slowly and sometimes quickly. I thought that it was acting like it was too lean so i richend it some. it still doesn't run right nomater which way i turn the needle. if i turn it to factory specs it will run better but not like it should:

Have you checked the idle screw? if the gap is set too large it could casue high rpms at idle and flood the motor atWOT.



not to mention the rubber exhaust connecter continues to fallofwhile i'm running it.

Mine are just held on with pull ties, from the vibrations diust and fuel they can work loose, might check those


I checked for air leaks there are none in the motor or the gas tank.Idoesn't matter if i change the glow plug orclean the air filter, it still won't run. This thing is awesome when it runs and im trying not tolose my patience. I spent alot of money on this thing, and i was expecting a little more out ofit.This is my first nitro, so most of myknowlege comes from the internet, so i don't really know what's wrongwith the truck.


Your in the right place for answers, im new to nitro also some im going from my experinces so far. YOu might search and see if theres an Offical post for your truck and post your questions there.


I did the break in right, and i've only run a gallon through it so i don't think that i need a new motor. This is REALLY frustrating please tell me what it wrong.The engine is a pro.15.
Thanks.


Hope ya get her running soon!

cooldriver385 11-27-2010 08:56 AM
RE: nitro problem NEED HELP!
 
That was a ***-holish move on charlie diesel's part.

joeseif 11-27-2010 10:48 AM
RE: nitro problem NEED HELP!
 
Is there an extra shin in the head for break in that needs to be removed?

1QwkSport2.5r 11-27-2010 10:50 AM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome

hi everybody!

About a month ago i bought a traxxas nitro sport. The thing has run good for a while, and then every thing goes south. The truck will stall if a give it WOT, sometimes slowly and sometimes quickly. I thought that it was acting like it was too lean so i richend it some. it still doesn't run right nomater which way i turn the needle. if i turn it to factory specs it will run better but not like it should. not to mention the rubber exhaust connecter continues to fall of while i'm running it. I checked for air leaks there are none in the motor or the gas tank. I doesn't matter if i change the glow plug or clean the air filter, it still won't run. This thing is awesome when it runs and im trying not to lose my patience. I spent alot of money on this thing, and i was expecting a little more out of it. This is my first nitro, so most of my knowlege comes from the internet, so i don't really know what's wrong with the truck. I did the break in right, and i've only run a gallon through it so i don't think that i need a new motor. This is REALLY frustrating please tell me what it wrong. The engine is a pro.15.
Thanks.
What kind of fuel are you using? (brand/nitro%) What glow plugs are you using? (brand/plug#) Also, how did you test the engine and fuel tank for air leaks?

Check and/or replace your fuel lines. With the engine running check for air bubbles in the fuel line. I've had engines stall immediately going to even 1/2-3/4 throttle only to find a pin hole in the fuel line. One good air bubble can stall an engine.

Lets start with this. There are so many factors that can affect how a nitro engine runs (or doesn't) that you have to diagnose the problem by process of elimination starting with the obvious.

rc awesome 11-27-2010 12:03 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: 1QwkSport2.5r


ORIGINAL: rc awesome

hi everybody!

About a month ago i bought a traxxas nitro sport. The thing has run good for a while, and then every thing goes south. The truck will stall if a give it WOT, sometimes slowly and sometimes quickly. I thought that it was acting like it was too lean so i richend it some. it still doesn't run right nomater which way i turn the needle. if i turn it to factory specs it will run better but not like it should. not to mention the rubber exhaust connecter continues to fallofwhile i'm running it. I checked for air leaks there are none in the motor or the gas tank.Idoesn't matter if i change the glow plug orclean the air filter, it still won't run. This thing is awesome when it runs and im trying not tolose my patience. I spent alot of money on this thing, and i was expecting a little more out ofit.This is my first nitro, so most of myknowlege comes from the internet, so i don't really know what's wrongwith the truck. I did the break in right, and i've only run a gallon through it so i don't think that i need a new motor. This is REALLY frustrating please tell me what it wrong.The engine is a pro.15.
Thanks.
What kind of fuel are you using? (brand/nitro%) What glow plugs are you using? (brand/plug#) Also, how did you test the engine and fuel tank for air leaks?

Check and/or replace your fuel lines. With the engine running check for air bubbles in the fuel line. I've had engines stall immediately going to even 1/2-3/4 throttle only to find a pin hole in the fuel line. One good air bubble can stall an engine.

Lets start with this. There are so many factors that can affect how a nitro engine runs (or doesn't) that you have to diagnose the problem by process of elimination starting with the obvious.
Here are the ansswers to your questions: byron's 20% nitro fuel, i'm using a traxxas super dudy plug. i looked up a video on youtube from a guy called squrriel (he seems to know alot about rc) i followed the indtrustions step by step on the video; cover the exhaust and the entrence to the carb and take fuel line and connect it to the carberator. I will look for air bubbles in the fuel line today. thanks for your help

rc awesome 11-27-2010 12:07 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: joeseif

Is there an extra shin in the head for break in that needs to be removed?
I didn't see any thing in the manuel about an extra shim that needs to be removed. thanks for your help.

rc awesome 11-27-2010 12:13 PM
RE: nitro problem NEED HELP!
 
The exhaust coupler will not stay on no mater what i do. i went to my LHS and they made a makeshift connecter between the connecter and the pipe. that seemed to work for a while, but i accdentally flipped the truck and the pipe came off. now it will not stay on. could i put some type of silicone in between the two parts.  thanks

joeseif 11-27-2010 01:19 PM
RE: nitro problem NEED HELP!
 
Can you bend the pipe hanger so it holds it tighter to the header?

1QwkSport2.5r 11-27-2010 01:46 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome

The exhaust coupler will not stay on no mater what i do. i went to my LHS and they made a makeshift connecter between the connecter and the pipe. that seemed to work for a while, but i accdentally flipped the truck and the pipe came off. now it will not stay on. could i put some type of silicone in between the two parts. thanks
That exhaust coupler is pretty critical to the engine running properly.. If the rubber tube from the header to the muffler is damaged, replace it. They're not that expensive. Use good medium size zip ties and strap them down as tight as you possibly can. (needle nose pliers work well for this)

You may want to run a different brand plug - that traxxas plug may not be hot enough for the fuel you're using. I use McCoy MC59 (hot) plugs on 25% nitro fuel and have great results. If you are certain the engine is free of leaks, the fuel system is free of leaks, and the problem still exists after resetting the needles then there might be something amiss inside the carburetor - debris or something.

cooldriver385 11-27-2010 02:06 PM
RE: nitro problem NEED HELP!
 
Is your fuel tank sealed properly? If it's not, then it's not pressurized correctly, which I believe can cause air bubbles and the engine can stall easily.

rc awesome 11-27-2010 03:12 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: joeseif

Can you bend the pipe hanger so it holds it tighter to the header?
It seems like the coupler is too short. what do you mean by the pipe hanger like the thing that supports the pipe. i think the only way that i could get it to stay onit to drill a small hole closer to the coupler. i will try to clean off the slippery exess fuel that is on the pipe

rc awesome 11-27-2010 03:13 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: cooldriver385

Is your fuel tank sealed properly? If it's not, then it's not pressurized correctly, which I believe can cause air bubbles and the engine can stall easily.
i see air bubbles when i cover the pipe to prime the eigine. Is this normal?

1QwkSport2.5r 11-27-2010 03:31 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome


ORIGINAL: cooldriver385

Is your fuel tank sealed properly? If it's not, then it's not pressurized correctly, which I believe can cause air bubbles and the engine can stall easily.
i see air bubbles when i cover the pipe to prime the eigine. Is this normal?
There should be no air bubbles showing up inside the tank (unless the tank is waaaay full) nor the fuel line from the tank to the carburetor. You might have the fuel lines backwards. The fitting on the tank closest to the front of the car should be connected to the muffler.

rc awesome 11-27-2010 05:49 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: 1QwkSport2.5r


ORIGINAL: rc awesome


ORIGINAL: cooldriver385

Is your fuel tank sealed properly? If it's not, then it's not pressurized correctly, which I believe can cause air bubbles and the engine can stall easily.
i see air bubbles when i cover the pipe to prime the eigine. Is this normal?
There should be no air bubbles showing up inside the tank (unless the tank is waaaay full) nor the fuel line from the tank to the carburetor. You might have the fuel lines backwards. The fitting on the tank closest to the front of the car should be connected to the muffler.
so does this mean that i have a leaky fuel tank, or a fuel line with a hole in it? i tested my fuel tank again, and i could hear a small hiss. i couldn't tell if it was from my mouth not sealing on the fuel line, or from the tank. the only time i see air bubbles is when i prime the engine. Does this mean that when the fuel system is under alot of pressure that it could suck in some air? thanks

1QwkSport2.5r 11-27-2010 06:21 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome


ORIGINAL: 1QwkSport2.5r


ORIGINAL: rc awesome


ORIGINAL: cooldriver385

Is your fuel tank sealed properly? If it's not, then it's not pressurized correctly, which I believe can cause air bubbles and the engine can stall easily.
i see air bubbles when i cover the pipe to prime the eigine. Is this normal?
There should be no air bubbles showing up inside the tank (unless the tank is waaaay full) nor the fuel line from the tank to the carburetor. You might have the fuel lines backwards. The fitting on the tank closest to the front of the car should be connected to the muffler.
so does this mean that i have a leaky fuel tank, or a fuel line with a hole in it? i tested my fuel tank again, and i could hear a small hiss. i couldn't tell if it was from my mouth not sealing on the fuel line, or from the tank. the only time i see air bubbles is when i prime the engine. Does this mean that when the fuel system is under alot of pressure that it could suck in some air? thanks
If the tank is pressurized, the contents inside the tank is being pushed out of the tank - not air leaking in. Did you test the tank by holding it under water? I plug the output port of the tank (closest to engine) and blow air into the tank using a long chunk of fuel line and hold the tank under water. You dont have to blow that hard to determine if the tank is leaking. Regardless, I dont think this is the problem. I think there is air getting from the fuel tank to the carburetor at the faster RPMS whether from vibration or a hole in the fuel line. If you have some new fuel line, use a small piece of it to re-test the tank. Blow air into the pressure fitting on the tank and plug the fitting that goes to the carb. See if you get air bubbles coming from the outside of the tank. If its going to leak, its gonna be at the seam in the middle of the tank or the cap (most likely). If the cap leaks, flip the gasket over in the cap or rebuild the cap. If the seam leaks get a new tank. If it doesnt leak, put it back into the car and try to re-tune the engine. Make sure the exhaust system is sealed well - good zipties! If the exhaust leaks even a little bit it wont pressurize the tank enough and the engine will starve for fuel. (if there is a ton of oil on the bottom or around where the coupler connects to the muffler, the connection isnt tight enough.

rc awesome 11-27-2010 06:31 PM
RE: nitro problem NEED HELP!
 
ok, so is the tank glued in or can i jsut pull it out. Could i just dip the fuel line in water and plug the other end with my finger to see if i have pin sized hole in thefuel line?

1QwkSport2.5r 11-27-2010 06:34 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome

ok, so is the tank glued in or can i jsut pull it out. Could i just dip the fuel line in water and plug the other end with my finger to see if i have pin sized hole in the tank?
On a nitro sport the top chassis plate comes off, and the tank should pop right out. To test the tank itself you must put the tank itself under water. Instead of testing the fuel lines, just replace them. If you've had the car awhile and never replaced the lines its not a bad idea to do it now. The biggest concern is whether or not the tank leaks.

rc awesome 11-28-2010 11:49 AM
RE: nitro problem NEED HELP!
 

ORIGINAL: 1QwkSport2.5r


ORIGINAL: rc awesome

ok, so is the tank glued in or can i jsut pull it out. Could i just dip the fuel line in water and plug the other end with my finger to see if i have pin sized hole in the tank?
On a nitro sport the top chassis plate comes off, and the tank should pop right out. To test the tank itself you must put the tank itself under water. Instead of testing the fuel lines, just replace them. If you've had the car awhile and never replaced the lines its not a bad idea to do it now. The biggest concern is whether or not the tank leaks.
ok i'll try that today, and i'll post again when i have the results.

rc awesome 11-28-2010 06:10 PM
RE: nitro problem NEED HELP!
 
all right, i found an air leak in the fuel tank hopefully this will solve the problem, i will also get new fuel lines and a hot glow pulg. Now all i need is to find away to get the exhaust coupler to stay on.

1QwkSport2.5r 11-28-2010 06:21 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome

all right, i found an air leak in the fuel tank hopefully this will solve the problem, i will also get new fuel lines and a hot glow pulg. Now all i need is to find away to get the exhaust coupler to stay on.
Since you have to buy parts anyway - I would bring the car with you to the hobby store and show one of the R/C people. If the current coupler isn't working they might have one that will work better if it isnt a stock pipe/header. Can you post a picture of your exhaust?

If the air leak is at the seam where to the top and bottom are put together, you need a new tank. If it leaks from the cap, you can get a small rebuild kit for the tank that includes a new cap, spring, foam washer, and a retainer screw for the foam washer.

rc awesome 12-01-2010 01:10 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: 1QwkSport2.5r


ORIGINAL: rc awesome

all right, i found an air leak in the fuel tank hopefully this will solve the problem, i will also get new fuel lines and a hot glow pulg. Now all i need is to find away to get the exhaust coupler to stay on.
Since you have to buy parts anyway - I would bring the car with you to the hobby store and show one of the R/C people. If the current coupler isn't working they might have one that will work better if it isnt a stock pipe/header. Can you post a picture of your exhaust?

If the air leak is at the seam where to the top and bottom are put together, you need a new tank. If it leaks from the cap, you can get a small rebuild kit for the tank that includes a new cap, spring, foam washer, and a retainer screw for the foam washer.
the spring on the cap was messed up causing it to leak, i got a new spring, so hopefully it will work. i all ready took the pipe to a hobby shop and they made a make shift coupler wihch worked for a week, until i flipped the truck and it feel off. i have not been able to get it to stay on. could i but some type of silicone over the connection to the pipe and the coupler to make it stay on? Thanks BTW new fuel lines and a hot glow plug are on the way hopefully this will solve the problem.

1QwkSport2.5r 12-01-2010 04:53 PM
RE: nitro problem NEED HELP!
 

ORIGINAL: rc awesome


ORIGINAL: 1QwkSport2.5r


ORIGINAL: rc awesome

all right, i found an air leak in the fuel tank hopefully this will solve the problem, i will also get new fuel lines and a hot glow pulg. Now all i need is to find away to get the exhaust coupler to stay on.
Since you have to buy parts anyway - I would bring the car with you to the hobby store and show one of the R/C people. If the current coupler isn't working they might have one that will work better if it isnt a stock pipe/header. Can you post a picture of your exhaust?

If the air leak is at the seam where to the top and bottom are put together, you need a new tank. If it leaks from the cap, you can get a small rebuild kit for the tank that includes a new cap, spring, foam washer, and a retainer screw for the foam washer.
the spring on the cap was messed up causing it to leak, i got a new spring, so hopefully it will work. i all ready took the pipe to a hobby shop and they made a make shift coupler wihch worked for a week, until i flipped the truck and it feel off. i have not been able to get it to stay on. could i but some type of silicone over the connection to the pipe and the coupler to make it stay on? Thanks BTW new fuel lines and a hot glow plug are on the way hopefully this will solve the problem.
If you can, take a picture of the exhaust on the car and post it. I wouldn't bother trying to use any silicone sealant or anything on it because its not going to last long. If the pipe is allowed to move any, the silicone seal will just break and start to leak. Most header/pipes use a chunk of silicone tubing to connect the two with zipties to hold them together. If you are running the stock nitro sport exhaust with the long "L" shaped rubber tube it should be ziptied to the muffler and the header. If you're not running the stock exhaust, take a picture because otherwise I don't know how I can help.

rc awesome 12-01-2010 05:16 PM
RE: nitro problem NEED HELP!
 
i'll post a picturee as soon as i get the chance. righ now i have it riged with a rubber band pulling the coupler in. the coupler just seems to short. i'll probably just order another one. right now the set up seems to be working; every thing is sealing nicely. BTW i've got new fuel lines, and a new hot glow plug hpoefully it will run better. it is the stock exhaust. thanks.well ran it and it doesn't work again. the guy at the hobbie shop buys rc cars so, thats were im going tomorow. good bye POS.

nitrostam 12-01-2010 05:44 PM
RE: nitro problem NEED HELP!
 
my friend had this problem and we ended up heating the header with a tourch and flaring the end a bit
ORIGINAL: rc awesome

The exhaust coupler will not stay on no mater what i do. i went to my LHS and they made a makeshift connecter between the connecter and the pipe. that seemed to work for a while, but i accdentally flipped the truck and the pipe came off. now it will not stay on. could i put some type of silicone in between the two parts. thanks


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