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What should the compression be running on all cylinders.

Posted by Anonymous on

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Hello Anonimous,
If The Compression Is Between 90-120 PSI And All Cylinders Are The Same +- a Few PSI THe Engine Should Run Fine.
Compression Should Be Checked At Wide Open Throttle!

Posted on Apr 04, 2015

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Check the compression in all cylinders with all spark plugs out the numbers should be within 8psi of each other

Posted on Mar 30, 2015

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1993 nissan quest wont start after over heating


Overheating will damage the head gasket and the cylinder head.
Insufficient compression in the cylinders due to leaks and the engine will not start. To begin with run a compression check on all cylinders and then any cylinder with compression not at spec run a leak down test to see where the compression loss is going.

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0 compression doesn't make any sense. it could be valves compression Rings or head gasket. I've never heard a cylinder getting 0 compression. I would do another compression test and double check it

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I have a 95 Chevy 1500 truck 4by 4 and I can't get it to start I tried everything it seems like it wants to start but nothing what could it be


well if it won't start it won't start...because your engine has lost 1 of 3 things that make it run: gas, spark, and compression. Don't tie yourself into knots over what it could be. Do the basics first. 1.Check that the engine is getting gas into the cylinders.
2.Check that the spark plugs in the cylinders are getting ignition current to make blue snapping sparks when tested.
3.If you have both spark and gas to all cylinders, you should do a compression test of the cylinders to know there is enough compression in the cylinders to make it run. Without good compression readings from all cylinders, no amount of money thrown at it will make the engine run better, you have to do mechanical repairs to the engine that restores compression first.

Most times, sudden no starts are gas or spark related. Check those first. Happy Holidays.

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most petrol engine run 145psi ( low compression engines) to around 165 psi (high compression engines) regardless of the compression read there should not be any more that 10% difference between adjacent cylinders Hugh differences in cylinders indicates valve problems

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1 Answer

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Determine what cylinder is misfiring and do a compression test on that cylinder. Compare it with a cylinder that is not misfiring. You should have no more than 20% difference between the good cylinder and the bad cylinder. If it is low on compression, suspect a burn valve or bad valve seat... and it will require cylinder head repair. If it is good on compression, then look for a faulty injector or some other reason for the misfire on the dead cylinder.

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Check engine compression and compare. then test running engine compression most engines have about 130-170 cranking compression and about 90-110 running compression. OR bring that cylinder to its Top Dead Center compression stroke apply air to the cylinder and check to see where the air is going open throttle plate bad intake valve, from exhaust pipe bad exhaust valve, from oil cap piston rings.

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1 Answer

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Sorry but I don't know anything about the electronics on the newer Twin Cam engines. I work on the carburetor equipped Evos and earlier model bikes. The first thing I'd do is to check the compression when the engine is cold. Check both cylinders and get the reading off the running cylinder to compare the not-running cylinder. If the compression is lower by about 15-20 psi, you may have a blown head gasket. This is one of the three things that you must have in order for any internal combustion engine to run. If the compression is alright, you need to check for fuel to the cylinder and ignition spark to the cylinder. The other two components necessary to run.

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#1 cylinder not firing, check spark plug, spark plug wire, remove spark plug and use a compression tester, and check the compression of that cylinder. should have at least 65 pounds of compression per cylinder. If the compression is low, you may try shooting a little oil in to that cylinder, replace spark plug, and try running motor again. if the compression is low on said cylinder, could be due to bad piston rings. requiring a motor rebuild.

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Do a compression check. You want to check and see if you have good compression across all cylinders or if you've blown you head gasket or rings. If you don't have any check engine light indicating a faulty crank position sensor, or a misfire on a cylinder, you may have fire on the cylinder but if there is no compression or low compression the vehicle will run roughly. If you need directions for doing the compression check or manually checking the Crank position sensor and other sensors that could cause this condition I recommend the Haynes Repair manual on your vehicle. Most major Auto Parts stores carry both Haynes and Chilton's manuals on vehicle. I prefer Haynes but Chilton's will do as well.

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1 Answer

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If the cylinder is not working because of spark a coil may solve the problem. If the cylinder is not working because of compression, it may be a bad valve intake or exhaust bad piston rings etc. A guide to go by is when you check the compression with a compression guage. The difference shouldn't be more than 10 psi between each. Good Luck

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