Suade907
04-26-2003, 05:21 PM
Hey Guys I have a Monster Blazer with a Ofna P4 motor in it. I'm not exactly new to this hobby and have tuned many vehicles in the past but this has me stumped. I was running the truck for about a week tuned to operate between 220 and 260 degrees. I use a raytech heat gun to aid in my tuning. The performance was great the truck idled great and it hustled great too. To say the least it ran fine for about a week solid. Well today I was running the truck for about 25 minutes the last 5 minutes were on a dirt motocross track. The truck had some major crashes but nothing at all broke and the engine tune was perfect. But as I came out of one of the turns preparing for a big jump the motor just konked out dead. I tried to restart it but it was a real pain. Normally this truck starts in one pull. But this time it wouldn't start at all. I then changed glow plugs and the same thing. Well I eventually got it running after a few minutes but things were not quite right the truck was running real fat and wasn't getting up to temp fast like normal. Then when it did reach temp it started to run a little erratic. So I shut it down and decided to clean the truck and the carb, fuel tak, fuel hoses thinking that some dirt might have snuck in somewhere. But to no avail after I cleaned everthing, the motor would not run anything like it did before. Now it won't hold idle after trying to tweak the carb setting for about 30 minutes even at temp and it won't run anything like before. It dies constantly I always need the throttle cracked open a bunch to start it when I didn't before. I tweaked the low and high needle settings to death to try to get it to maintain a tune and it was not happening. I was thinking that the carb got some junk in it so that's why the low end needle couldn't hold a idle. I decided to change the carb and to no avail the same problem plagues me. Do you guys think that this motor is caput. It only had about 1 galleon through it? Is this what happens when a motor goes bad? I was using mcoy MC59 glow plugs too, I understand thse are supposed to be hot ones.