motor problem

[chase5004]

I have a 93 mercury 150 xri (black max). When I am at low speeds, (gettin out of the hole) the temp gauge goes way up, and a couple of times my idiot light/ siren have gone off. This happens when I am at this low speed for a extended period of time, (2-3 minutes). A better example would be when I am idling kinda fast watching my graph for structure.

Now here's the kicker. The motor is spitting water good at idle, and at low and high speeds. If I get on the throttle and get out of the hole right away the temp is about where it should be. It is also fine when I am on plane cruising around. The temp is also good when I am idling and not in gear.

Any help trouble shooting would be appreciated. I am gonna try and replace the thermostat and see what happens.

Thanks in advance
Pat

[djkimmel]

Do you have a water pressure guage?

What does it show during the plowing times where the temp spikes?

Has it been a while since you had a new impeller put in?

Sounds a little weird, but they always say 'city' driving is harder on the engine than 'highway' driving...

[chase5004]

I ended up speaking with 3 different marinas, and all three said that it was probably the impeller. So, I took it into Jans today, and they said I would probably have it tomorrow. I thought about doing it myself, but having never taken a lower unit apart I would hate to mess something up, so I figured I better let the pros take care of it.

Pat

[djkimmel]

I agree with your thoughts on messing with lower units - I don't have a great history with that.

I was thinking impeller too. I will cross my fingers for you that Jans does the job quickly and that you no longer have the problem.

[chase5004]

I gotta give a good plug to Jan's Sports and Marine in Goodrich. I took my boat in on Tue around 430pm and I got a call around 1030am on Wed saying that they had the work completed on the boat. Now that is a pretty good turn around if you ask me. I am looking at being back on the water real soon thanks to Jan's

Pat

[chase5004]

By the way the problem was the impeller and housing.

Pat

[djkimmel]

Glad it was diagnosed and fixed. Gotta have the boat working for a while yet... the good fishing is just getting ready to start.