mercruiser runs rough

[ELLIOTT9509]

my searay 1986 with twin 260's Alpha 1 has a problem with one engine after running for 1 hour. It starts to run rough and miss, and I must idle it for a while or shut down.I am told it has to do with a heat sensor on the block or the manifold.Can this be repaired prior to launch in May, or must the boat be back in the water, and , does any one know what it is. <br />This only happens after 1 hour. Ichecked the water separating fuel filter, and put clean gas.

 

[f_inscreenname]

Re: mercruiser runs rough

Change it now. If you think that is it. Sitting on the water or land with your head in a motor box the view is the same.

 

[Trent]

Re: mercruiser runs rough

To be for shure..Swap heat sensors from one engine to the other.....Your lucky TWO ENGINES

 

[johnkc]

Re: mercruiser runs rough

elliott, the only thing the heat sensor does on your engine is to give a signal to the temp gauge.unless you have added some other temp sensor.i would check out the ign. sensor and wiring from dist .to ign. amplifier and the amp. itself.maybe swap just the amps. see if the problem switches engines?????when checking the ign.sensors look for corrosion on the flat copper leads going to the printed circuit board of the sensor these were always covered with green corrosion.

 

[ODDD1]

Re: mercruiser runs rough

John is right on this....go for the ignition..temp sensors dont make motors run bad...