i am a newbe here but i know that i am in the right place my problem is when i take the glow plug starter off the engine stales i am useing a #8 plug it's around 85 to 95 deg outside should i be useing a diff plug can anyone help me thanks

Where is your low speed needle set? While it's idling is it creating a puddle on the ground under the pipe stinger? Try two turns out for starters. Is it a brand new truck? Are you removing the igniter as soon as the truck starts? You may be too rich on the LSN.

Mine came way rich on the low speed needle (LSN) and the high speed needle (HSN). When the truck is cold I sometimes leave the igniter on it for a minute while it warms up.

i am new to the truck had it about three mounths i have beem busy so i have only ran about two tanks of gas i have just noticed that one of my head screws was was not tighten could of been sucken air what is the diff with the plug numbers i have #8 i am going to put all the jets back to there stock settings an see what s up this is a very good site thanks is #8 plug good

Glow plugs come in different varieties: Hot, medium and cold. The OS 8 is a cold plug that is usually used with fuel of a high nitro content - say 25% and up. It sounds to me like you have a damaged plug. Try taking out the glow plug adn putting it in your glow ignitor and make sure the element is getting hot. If you ran real lean (loose head screw will cause that), it can damage your plug.

I found this:

Heat range isn't the best term to describe what transpires within the glow plug. Outside the world of science and technology, words such as "heat" and , "temperature" are often used interchangeably; unfortunately, however, they don't have the same meaning. Without belaboring the point, I'll just say that I prefer to use the term "temperature rating," which is more scientifically correct for describing how the glow plug advances or retards an engine's ignition-point timing. As long as you understand that the traditional words "hot" and "cold" actually refer to temperature, you can call the phenomenon anything you wish! There are times when "hot" and "cold" are less clumsy to use.

Example: assume that a "hot" (hightemperature-rated) glow plug has replaced a "cold" (low-temperature-rated) plug. How does this affect the engine's ignitionpoint timing? The ignition point advances; that is, it occurs earlier in the compression event. Why does this happen? During normal engine operation (with the starting battery removed), the "hot" plug's higher element temperature allows the compressing air/fuel mixture to arrive at its ignition temperature before that of the "cold" plug. Recall that plug-element temperature is the result of combustion temperature and catalytic action temperature, with compression conditioning of the air/fuel mixture acting to initiate combustion. The opposite happens when a "cold" plug replaces a "hot" plug; the lower temperature of its wire element requires more compression conditioning of the air/fuel molecules to reach its ignition temperature. This takes place closer to TDC and therefore acts to retard ignition-point timing.

Copyright Air Age Publishing Aug 2004
Provided by ProQuest Information and Learning Company. All rights Reserved

Hope that helps!

That's a great explanation it's easy to understand. My question is how do you determine if you need to advance or retard the timing (change the temp of the plug). It's always been trial & error for me until I hit a plug that'll make that particular engine run best. I would love to know a better way.
LSTRacer can you give me a web address for proquest info that looks like it could be a interesting wib site

I found this very Helpfull! when I first started with Nitro, I still Look on there once in awhile.
http://www.*********.org/cars_eng-tuning.htm

Sorry Ben, the article was off of findarticles.com. I get lots of great info from that site, on many things other than R/C too. I'll keep looking though, and post any results I find.

Here's another great article:
[link=http://www.rcnitro.com/rn/articles/glowplugs.asp]Glow Plugs[/link]

would you know why it is when i take the glow plug started off the engine dies if i keep it on it stays running i have tryed leaning it out

i have started to look at the web sites you posted thanks great info thanks again

The engine dies straight away because it is being over fueled. Simply, the glow igniter is keeping the glow plug lit. You need to lean your HSN. After this adjustment, if the engine stalls as you try to drive away, the LSN needs leaning.

Don't get to carried away turning needles though. You should be concentrating on adjusting the HSN first to gain best performance. Then, the LSN to achieve snappy throttle response.