05-21-08, 10:34 PM | #1 |
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Join Date: Mar 2008
Posts: 8
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'88 Mercury 150 XR4 Beeping and Cutting Out - Need Help!
Hello all. For the past several months, I've been restoring a 1985 Charger Foxfire with a 1988 Mercury 150 XR4 on it. I finally had a chance to get it out on the water today (for the first time), and ran into some problems. I have done the following to this motor to date:
• Replaced water pump. • Rebuilt fuel pump. • Replaced the oil lines. • Replaced 1 switch box. • Drained and replaced lower unit oil. When I got her out on the water, I ran into some trouble. The motor starts fine, and idles beautifully. The boat comes out of the hole quickly, and rides great. The problem begins when I get her going past about 1/4 throttle. Once on plane, and at about 1/4 throttle, it runs perfectly and purrs like a kitten. Once I push it to about 1/2 throttle, the throttle control/housing starts intermittently beeping beep - beep - beeeeep - beep, and the motor begins to run rough. There is no pattern to the beeping, but it doesn't stop. The motor itself stops running smoothly at about 1/2 throttle, and the prop in the water starts to make a "garble" sound, like the prop is not running in clean water. The further I push the throttle, the higher the RPM's go, but the boat does not pick-up any speed. It just runs really rough, and won't go any faster. I tried giving it gas around a corner to see if cavitation was the problem, but it didn't change anything. I'm really at a loss as to what the problem might be. Can anyone out there help me figure this out? Thanks so much ac. |
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