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post #1 of (permalink) Old 06-04-2004, 10:36 PM Thread Starter
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Help; Engine rumbles above 4K RPM; progressing

My daily driver Sammy ('87 stock 1.3) is developing a motor problem. I drive it around the 4000-4500 rpm range on the highway, because I have 29 tall tires and shifting back and forth to 5th gear doesn't work very well. The engine has started moaning/rumbling above 3900 rpm. The sound happens going uphill, when the motor is under load. It uses a quart of oil every 1500 miles, does not smoke, and it's not losing power. Oil pressure is normal. At idle, the engine does not knock, it makes a valve train clatter, like it always has (I've got the valve lash set at .006 or is .06?) At idle, I can hear a little exhaust leak around the bisket or manifold gasket. Any way, the problem seems to be getting worse, I can feel a roughness/vibration starting at 3500 rpm on up. I don't think the problem is in the bottom end, could it be a valve? Sorry for the information dump, but I depend on this vehicle to get to work, I don't want to end up walkin' down the highway again (the water pump shelled last week).
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post #2 of (permalink) Old 06-05-2004, 12:54 PM
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Re: Help; Engine rumbles above 4K RPM; progressing

if you have the gm alt on there and it is doing this I am thinking it is either out of alignment still or not rigid enough mive had vibration problems untill I added another arm to the alternator the alt I used was suposed to have 2 sliding upper mounts
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