Stalls when igniter is removed :(

[4hero]

Hi guys,

I finally got my MTA4 running after lots of effort, but now when I remove my glow igniter the buggy stalls. I had a look around for help but am completely stuck.

Would anyone have any advice please?

Thanks in advance.

 

[jetmechG550]

Needs a new glow plug

 

[Timmahh]

your H needle or L needle are prolly set a bit rich. so when you pull hte ignitor off, the over abundance of fuel comes in and cools off the glow plug coil. you can do a few things.

if the motor is new new, you can slightly loosen the glow plug for a minute while running, this will cause an air leak and heat up the stuff a bit faster and may help out. but most likely you ll need to make a small lean adjustment to your H or L needles. id try turning the H needle just a smidge lean, maybe 1/8th of a turn and try again. if it does the same thing do one more 1/8th turn lean on the H. if it still does the same thing, re richen the H needle 1/8th of a turn and lean out hte L needle 1/8th. between two of these adjustments your motor should run.

but b4 you start turning needles. pull the plug, turn the car upside down, and pull it over a few times to make sure you dont have fuel buildup in the crank case.
then try to start. if no luck start by doing the 1/8th lean turn on the H as i described above. once the motor is running with out the ignitor installed, richen up the last needle you leaned a tad to be sure your tuning is safe.

 

[4hero]

thanks Timmahh, it is brand new and I'm still trying to run it in, after failing to get it started due to faulty igniter. I'll try these things out and let you know how I get on.

 

[jetmechG550]

Dude it's got nothing to do with the tune, it's a fouled plug. New engine's usually foul a plug or two on break in. Trust me, replace the plug and don't mess with the tune until you have it broke in a running

 

[robmob]

Jet’s right.

Replace the plug before messing with any of the needles.

 

[Mallanaga]

that advice is great, but take it with a grain of salt.

only blame it on the plug during break-in. any other time... chances are, it's the tune.

 

[robmob]

If you replace the plug and it still has the same problem than obviously you need to start messing with the tune. You can then put the old plug back in and start messing with the needles.

Don't start messing with the needles before finding out if it's the plug first. That is like taking the engine apart in your car when it won't start without checking to see if you have gas.

 

[bourney2006]

new plug

 

[Timmahh]

not trying to start a my dad beats your dad flamefest, but, I'm my experience i have found that some motors are SO rich from the factory, they need a tad bit of adjustment just to keep them running.

Half of the new motors I've dealt with have started without issue. others have needed some SLIGHT adjustment to get to run and run without haveing to feather the throatle to keep it running, or leave the ignitor on to keep from flaming out.

now if your Fouling a Glow Plug during break in, its typically due to the fact the tune is overly rich, and the excess fuel slamming against the hot coil actually damages the coil, causing the glow plug to fail. why this isnt the only reason a glow plug fails on a new motor being broken in, it seems to be the most comon.

Now Granted you dont want to try to performance tune the motor yet, but to lean up the H needle 1/12th a turn will not hurt the motor and most likely allow the motor to idle, ignitorless without flaming out.

If the installed Glow Plug gets hot and is a good match to the motor and nitro percentage, then that tells me its just a tad to rich, as a new motors needle settings should be.

obviously the glow plug should be checked to see that it glows and putting a new one in wount hurt a thing, but if it also stalls when he pulls the ignitor off when he starts it, then the needles are still rich, which is what I predict will happen.

like i said, in my experience with new motors, it just goes with the territory to have to adjust the amount of fuel flow to get a good Fuel Air mix happening once in a while.

T

 

[TeamLosiNXT]

Ill 2nd that. Mine did the same stuff and I had to lean it out a tad.

 

[chuck3]

id say start with a new plug and then follow timmuh's advice, it makes alot of sense.

 

[Rolex]

Timmahh is only new to THIS site, not to RC. He comes to us with a lot of experience and good credentials.
I agree with his advise. Check the plug, or put in a spare, then start to make slight adjustments till it all comes to life. Good Luck. Keep us posted.

 

[Timmahh]

Thanx for the Support Rolex. For those of you that arnt familiar with me, while in nowhere near a national R/Cer or even a Regional R/Cr, i have had some good experience with plane old hand on use. Myself and my two neighbors are all surface R/Cers, and i have been dubbed the fixer dude> lol anytime any of us have an issue with our 1/5th gassers or 1/8th nitros or whatever we re trying to destroy that week, I'm the one that gets to problem solve ALL the issues. lol Good thing i have the paitence god gave a saint or i would of killed a few neighbors and smashed more than one RC in my lifetime.

lol
T

 

[jetmechG550]

Look, I think your missing the point and trying to justify doing so. The statement was I finally got my such and such running (read as it took me forever to get my NEW such and such running) (also read as I'm breaking in a motor) and now (after it had run a for a while) when I remove the glow ignitor it won't run (meaning...from all my experience, gee the glow plug is dead). Glow plugs die from a multitude of reasons and what you stated was fine but don't ya think that if you're just getting a motor running it's fouled??? Ya change the plug cause....Glow Plugs don't just come back to life. That was the answer to his question, not a dissertation on how to tune a motor. Yeah if you put in a new plug and it fouls right away, then you have a tuning issue. How about you give a little insight to him about how to read a plug and then tune before you just go jumping into the lean it here, do this, your doing this wrong, I know from experience stuff. It's stuff like that confuses noobs and also frustrates them.

 

[Timmahh]

well, it has Nothing to do with Bedazzleing as you seem to think it does. i ll leave that up to Miss South Carolina!!!

But it HAS everything to do with shareing Knowledge. WAY to many times you go into a thread and someone says Do that, Do this, That is your issue, but in no way tries to elaborate on the cause of the issue at hand.
now Yes glow plugs fail all the time on new and old motors. i have a motor here in my SIG QB P 51, that is older than dirt. its and OLD K&B 61, and has probably seen more fuel than my Safari Van that has 200,000 miles on it. it fouls out glow plugs too when its set too rich on the H needle setting.

Saying Change the Glow plug, is like telling someone with a non running 1:1 car to put gas in it. sure more gas COULD help, but its most likely NOT the cause of the car not running. the more you educate people the more they learn, and in turn share their knowledge with the next Newb.

i could be like most others and say change the glow plug, but would i be doing anything more than telling the OP to spend and extra 5 bux he may not need to? not likely.

if it is running with the ignitor on it, then 98% of the time the glow plug is working fine. so that leaves the next logical option, the motor is jetted rich, so to Lean up the H needle by on HR and see if it will now idle WithOut the Ignitor attatched, is the next thing one should do.

have i had a glow plug work with the igniotor and not work with out it on a normally well tuned motor? sure i have, but its the exception to the rule in my experience. in most cases, the tuning is Just a tad to rich, and the glow plug is fine.

its about shareing knowledge and experience. thats all.
the more you less you blow.


T

 

[Rolex]

So, has anyone heard from the thread starter 4hero? I'd be curious to know what he's tried.

 

[Timmahh]

i havent. Hopefully hes out running the snot out of his rc and burning thru the 1st gallon so he can really get it tuned up and running well.

 

[Draven]

Hi, same problem, I pull the Ignitor off and my truck dies. Today i bought a new glow plug and popped it in, ran fine for a few passes in my yard and it would no longer start so i checked the glow plug, the coil was full of something, not sure what. put the other glow plug back it and again won't stay running without the ignitor.

 

[MudSlinger33]

This thread was started in 2007. You may get a better answer if you start a new thread.