Re: '89 88HP temp sensor
Tony.... Yes, the horn should beep when you first turn the key on. That indicates that the warning system horn is functioning properly.<br /><br />There should be a wire (usually purple) leading from the ignition switch (12 volts when the key is on) to the horn, and another wire (tan) leading from the horn to the heat warning sensors in the cylinder heads. If it is a three (3) wire horn, there will be another "black" wire going to ground. Anything else hooked up to that horn will create a problem.<br /><br />If the above wiring is correct, reverse the purple and tan wire. That horn is finicky. If the wires are on the wrong plug on terminal, the horn will be erratic.<br /><br />Yes, on your engine (88hp), unless you've added something that doesn't belong there, the only warning you'll have is the overheating warning (steady constant beep). Note that the warning sounds off before the engine is hot enough to do any damage.<br /><br />The ignition switch hanging up problem... If the key is actually sticking in the "Start" position, replace the switch. If, on the other hand, the key is returning to the normal run position but the starter stays engaged, that indicates a sticking "Starter Ssolenoid".<br /><br />Solenoids go bad in that manner due to a faulty or low battery which causes arcing in the contacts within the solenoid. The cure, if this is the case, is to make sure you have a good battery, and replace the solenoid.
