On occasion my 97 lumina will develop a valve or lifter tick (not a knock) and have an extreme loss of power. it happens about once or twice a month...it has 109,000 miles on it but has been maintained...any ideas?
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Re: valve/lifter tick and loss of power
What this means is either one or more of your lifters is begining to fail. they are hydraulic and what that means is that oil from the pan flows into them which allows them to expand. seeing that it's not a constant problem rules out being a cam lobe that is worn out. a l;oss of power is due to an itermittant miss due to the fact that the lifter does'nt open the valve on your intake side to allow fuel to go to that cylinder. your going to have to replace the lifters and because of that a top end rebuild is required.
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Prognosis is really bad, hate to tell you. Ticking comes from the valve lifters, losing lubrication due to lack of pressure and running dry. At redlights, when revs are at idle, oil pressure drops a lot, and engine really suffers. Have the vehicle taken immediately to a shop for proper diagnose and to see if engine can still be saved. The loss of power comes from the valves not actuating properly. Hydraulic lifters need oil at a decent pressure to "charge" , and if not charged, they will stay compressed, ruining valve lifting operation.
lifters tick and noise is upper end of engine if lifters are making noise could be from a bad valve,bad lifter ,push rod ,oil pressure,rocker arm - need to take do compression test find out if valve problem and which cylinder is problem also take off valve cover and check for proper oiling of valve head and look to see if and are damaged or loose-------a knocking sound usually comes from lower end of engine,rod knock etc.and thats usually rebuild of engine
Sounds like a lifter noise. worn lifters can't keep oil in them anymore so over night the oil leaks out. when you start the vehicle, you will hear a ticking noise or knocking noise till the lifters fill with oil again. only remedy is to replace the lifters.
you could try an additive but it's temporary.
Most dodge motors have adjusters on the rockers for taking up slack in the valve-train. when these get worn or plugged by dirt they turn the valves from soft hydraulic to hard ticking due to a space between the lifter and the valve. If this is an overhead cam with roller lifters then these have become worn or fouled.