Mechanic says no compression on cylinder #1--engine missing badly. we have 146,000 miles on what has otherwise been great car. Mechanic says he's "99%" sure it's a problem that can be fixed by re-working the head. (for around $1800). Is it worth the gamble on a car with so many miles on it?
There is a metallic "clink" when the motor is running, and the car has been using a couple of quarts of oil every 3000 miles for over a year. HELP!!
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Re: no compression on cylinder #1
No compression on #1 cylinder, engine missing badly, a "metallic clink" when the motor is running and gobbling 2 quarts of oil every 3000 miles. I would vote a strong NO,it is not worth it. Not for $1800. at the very least I would get a quote on just replacing the engine with a low mileage engine at a large, reputable junk yard.
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there are such things as new coils bad from the factory.. Engine control computers have been known to go bad as well. Check the connectors from computer to the diagnostic port, make sure they are tight, make sure your engine has no vacuum leaks, and check as electrical connections of battery, coil, ignition module, etc.
Well, I would probably get a second opinion next. A random miss code is just that, the computer is seeing a loss of power on different cylinders at random times. If cylinder number one had a dead miss you should get a code 301. It could be something mechanical such as a burnt valve or bad rings, but that is usually on one cylinder. At least take it somewhere else and have a compression test done.
you could have bad plugs and wires.clogged fuel injectors.and low compression.leaking intake.this is a list of possible causes for cylinders miss.do a compression test.it will pin point problem quickly.
I have had continuous missing issues on my 1997 Silverado after i had a new engine installed 30,000 miles ago. Today I purchased a new gasket for the EGR Valve and removed it. The mechanic had re-used the old gasket when he replaced the engine and cut corners to save $2.00. I found he had installed the EGR bass-ackwards causing my check engine light to stay on and the engine always to miss. Engine runs GREAT now
the car might still be under warranty. if you bought it as a certified used car they add on 25,000 miles to the existing 50,000 miles. If cylinder 1 is coming up misfire and your mechanic sees something wrong in that cylinder there most likely is some truth because if the cylinder was not firing right (detonating and discharging raw fuel) this would blow out the catalytic converter. The best way to see if it is a bent or broken valve is to buy a leak down tester which is part of a compression test. basically depending on specs you crank engine over grounding coils and see if all cylinders put out the same compression within 10psi of each other. it is usually around 160 -200 psi per cylinder. now to do a leak down test just leave pressure in and see rate of decreasing pressure and compare to other cylinders. if everything checks out i dont believe to be anything wrong with cylinder. Oh i forgot to ask any check engine lights on besides a cylinder 1 misfire P0301?
Its possible you have a problem with the valves and not the bottm end You would have to take the rocker cover off to see if the valves are adjusted properly As time goes by the valves slowly sink into the head and get too tight against the rocker arm,The end result is that the valves open too soon and close too late.Because it is happening to the cylinders that they are it means tight valves because of the pattern that they have failed in.Could also be head gasket.But before letting the crusher get it its worth checking.If one cylinder is still capable of making 155psi then the other cylinders should be able to.I believe your problem has something to do with the head.Thanx anyway