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Original Message
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| It could be a number of things !!! |
| By mcj67 - 01/24/2001 2:26:35 AM; IP 12.78.121.178 |
Schu, Yes your intake manifold could be leaking, A good way to check it is to use spray type carb cleaner and after the engine warms up carefully spray a light amount around the ajoining surfaces of the intake manifold, carburator, vacume line connections, if there is a leak you will notice a change in idle speed.(be carefull around the plug wires don't start a fire) Does the vacume guage hold a constant reading durning idle or does it jump back and forth-( bad valves will make it jump).Have you done a compression test to see whats up, do you have excessive crankcase ventilation? If your rings did not seat properly during brake in,this could also cause a drop in vacume. Check your crankshaft to camshaft timeing, running hot and a loss of vacume may mean you could have jumped time.You stated there is only 8,000 miles since rebuild, but it still could have jumped time, also the dowel that positions the camshaft gear on the camshaft could have sheared, its rare but not impossible. Whats the exhaust look like? Does it smell like it is running rich? Is there a heavy black residue in side the end of the tail pipe? A really over rich fuel mixture can washout the oil in the cylinders causeing the rings to prematurely wear out
Do you have vacume assisted power brakes, the booster diaphragm could be split. You metioned some spark plugs were black, are you using a lot of oil? broken rings will cause a loss of vacume, compression, and cause oil comsumpsion. Did you replace or check the valve gides? Does it smoke a little when it is first started? Bad valve gides will cause some oil consumption, also the valves will not seat properly some times and cause a loss of vacume and compression. well maybe this will help you Good luck Mike Jones |
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