951 xp going wide open on its own??????? help!!

[wakemkr]

I have a 99 xp just installed new motor, started ran for about 5 mins ok, then restarted ran good then would surge up to 35000 with out giving it gas, idle screw is backed all the way off.Restarted it idled ok for 1 min the started going up in rpm to 7000 tried to hit stop botton didnt work pull lynard still ran, ???????If you hit the gas it brings it back down to about 3500,then goes back up in rpm. Not sure if its a cab problem or block sealing issue. Stop button and lynard work ..just dont seem to work when it goes wide open so looks ike i have 2 issues..........

 

[Chester]

Re-adjust your throttle cable. It's holding the throttle open. What you are experiencing is called "glow plugging". It will run WOT without spark from the spark plugs. The best way to stop the engine is to pull the choke out.

Chester

 

[custompartsguy]

I have a 99 xp just installed new motor, started ran for about 5 mins ok, then restarted ran good then would surge up to 35000 with out giving it gas, idle screw is backed all the way off.Restarted it idled ok for 1 min the started going up in rpm to 7000 tried to hit stop botton didnt work pull lynard still ran, ???????If you hit the gas it brings it back down to about 3500,then goes back up in rpm. Not sure if its a cab problem or block sealing issue. Stop button and lynard work ..just dont seem to work when it goes wide open so looks ike i have 2 issues..........

You stated you installed a new engine, check the carbs and intakes for air/vac leaks

 

[98xplimited626]

Im having the exact same problem with my xp limited. I just put a new motor in and same exact thing happened! If you've figured this problem out please let me know what it was!
thanks!

 

[riverrat88]

Make sure the gaskets between the carbs and intake are new and seated properly.