1995 150 intruder running hot???

[drwatson69]

I posted awhile back about engine skipping if high rpm's were reached. found out that powerpack was going to SLOW mode due to temp sensors. I unplugged sensors and motor would run WOT. Did not run much at WOT just long enough to see what it would do. block felt very warm to hot. pee hole was peeing good. Had some steam coming out top exhaust ports next to pee nozzle. I removed the thermstats and restarted. block cooled down even though water out of pee nozzle was not very strong at idle. plugged the sensors back up. when i tried to take off again the buzzer went off steady and went into SLOW mode again. I disconnected the sensors again and taped up wires. took off again and run fine. only run a short distance then stopped and checked block. OK felt fine. I have just got through installing a new oem water pump kit, new thermstat and springs. cranked motor up in yard with the ears muffs. let run for a little bit. block fells fine until I start revving it up. If I hold it at a steady mid range rpm after a minute it started the skipping/SLOW MODE again. block is warm but not hot. I OHMED the temp sensors to ground with a DVM and they read OL. they are not shorted but with them connected it is still doing what it was doing before. if disconnected motor runs fine. How hot should the block and water coming out get and should it be steaming. water pressure gauge is not working. I have a telflex temp gauge on the way. water stream out of pee nozzle is very strong. BAFFLED.

 

[CharlieB]

Re: 1995 150 intruder running hot???

You need to check the temp sensors when the ignition goes into the SLOW mode.

It is possible that either a head gasket is leaking WOT combustion gases into the cooling system, or one or more water deflectors are beginning to fail and not channeling/directing water flow correctly, either can cause a 'hot spot' in a cyl head at the sensor.

Then again it could be a weak SLOW circuit coming on at too low a temp.

Verify the temps in three areas of each head using temp melt sticks, if any lines melt then definitely pull the heads and find out why.

If the melt stick lines remain normal I would begin to suspect the SLOW circuit.

You do have all spark plug wires/temp sensor wires routed well away from each other, right? Ignition interference has caused problems, if the temp sensor wires are too near they can pick up static from the plug wires and the system goes strange, either misfires the ignition, goes into SLOW, etc.

 

[drwatson69]

Re: 1995 150 intruder running hot???

thank you for reply.