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No compression two cylinder

How to fix lost compression in two cylinders

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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rehortonjr
  • 47 Answers

SOURCE: High compression in 1 cylinder of a 170 ci. 40 psi high.

Hi!

Per the Ford manual, the acceptable range is 155-195 PSI. It sounds to me like you don't have a compression issue with this engine (without knowing the exact readings for each cylinder). Normally one cylinder being higher than the others, but still within spec, would not concern me a lot. Had one been much lower, then I think that might be cause for concern. There could be many reasons for the one hole being higher. If the engine hasn't been rebuilt in a long time, there could be carbon deposits in the compression chamber. There are many chemical fixes for this availble at your local parts store. If the engine is running fine with no pinging or detonation, I'd just continue to enjoy your classic ride (I own a 1971 Challenger converitble with a 440-6 pack, so I understand the joy of a classic car!).

Good luck and please let me know if this helps!

Bob

Posted on Oct 10, 2008

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  • 119 Answers

SOURCE: MISFIRING ON CYLINDER 1 VW POLO 1.4 3CYLINDER

I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.

Posted on Jul 23, 2009

  • 691 Answers

SOURCE: i lost compression in one cylinder

Lost of compression is due to either leaking head gasket, valves not closing and seal properly or piston rings are worn and need replacing. One can tell if you have bad head gasket, oils contaminated by water when looking at dip stick, bad valves cause some smoke and run rough, worn piston rings will cause lots of blow-by and will cause white smoke heavily and also runs rough. Being 1968 original motor and never have been rebuilt will probably have over 100k mile will be needing tear down and rebuilt. Rebuilt it correctly will get another 100k plus. being 1968, doing your head and valves job or replacing head gasket if that is the problems and you can get by it. worn rings, I would rebuilt it completely instead repairing one or two cylinder unless you plan to get rid of it.

Posted on Aug 07, 2009

ghost45
  • 1280 Answers

SOURCE: one cylinder has zero compression. took head off

OK!... did you do a cylinder 'leak down test'?.. .if not, do it! If any 'unacceptable' leakage, have the head REDONE! NOW!.. you must BE SURE the valve timing is accurate!... Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.

Posted on Oct 04, 2009

hansola
  • 279 Answers

SOURCE: NO COMPRESSION ON ALL CYLINDERS - TESTER GAUGE GOES UP THEN DOWN

The fault may very well be with the tester itself: The compression tester should have a check or "HOLD" valve which causes the needle on the gauge to REMAIN at it's highest recorded point. For example, my 1993 Isuzu Rodeo had a compression of 160 psi. The gauge "holds" the needle at the measurement UNTIL THE VALVE IS RELEASED-(mine had a button that needed to be pressed to release the pressure) then there will be a slight discharge of the pressure contained within, the needle should drop back to zero, and THEN you should be able to remove the tester. What I am getting at is if the pressure drops that fast, I think the "HOLD" valve on it may be defective, OR the tester is not properly sealing on the combustion chamber (stripped threads?). Might be worth buying another one for 20$ just to be sure.

A four cylinder engine, you say? Very rarely will you have ALL of your cylinders exhibit the same pressure loss symptoms. How did the other three cylinders test?

Here are the components required for a running engine to fire:
1-good spark (adequate voltage, good plugs/wires)
2-dedicated fuel supply (fuel pump with adequate pressure)
3-timing (slack in timing chain/belt?)

If the timing belt broke or maybe even jumped a tooth or two, it COULD cause DAMAGE to your engine-pistons hitting valves-if it IS what they call an "INTERFERENCE" engine.

Hope this helps.

Posted on Dec 31, 2009

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1 Answer

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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I have no compression in the 7 cylinder


Failed Valves

Head Gasket

Maybe other issues as well

Why not do some testing & find out

Forget the compression test

Cylinder Balance,Cylinder Leak Down Test
Do those

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Blue smoke at low rpms on a 22re toyota


Blue smoke indicates burning oil in the cylinders. Could be worn piston rings, worn valve guides, or bad valve stem seals. An engine compression test may help find it, but a cylinder leak-down test is a more precise way to find where compression is being lost. If compression is good, you just may need to replace the old rubber valve stem seals. A shop could do it without having to remove the cylinder head, using an air compressor hooked up into each cylinder while the valve train is being worked on. The air is used to keep the valves from falling into the cylinder while the seals are replaced. About a 4 hour labor cost, so expensive, but a lot less than a cylinder head removal.

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1 Answer

1993 Subaru loyale no compression, have spark at the coil just won't start


The engine can't run without compression in the cylinders. The plug will still spark, but without a compressed air/fuel mixture to burn and power the cylinder down, the starter will just keep spinning the engine over, cranking forever and not starting.
Check if your timing belts are good and not broke. Cylinder compression is dependent on good piston rings, intake and exhaust valves that open and close at right times and that seal good when closed, and a head gasket that seals up the cylinder from leaks where compression could blow into the water passages, or oil passages, or to outside of engine.
If the timing belts are good, a leak-down test of each cylinder will pinpoint where compression is lost.
Good luck with the Sube, great cars, great engines, but the head gaskets are a common problem.

Jun 11, 2013 | Cars & Trucks

1 Answer

Low compression cylinder


Time for a new car, unless you want to spend the big bucks to repair your engine. Low compression, below 100 psi, means the cylinder will not fire, will miss, have low power. The reason could be a blown head gasket, worn rings, valves not seating properly-at the very least, the cylinder head will have to come off. Before doing that, though, do a leak down test to pinpoint the cause of low compression in that cylinder. If just one cylinder is low, and you have good compression otherwise, it may be worth fixing. Tercels are low value beaters, but I owned a '94 tercel, and I loved it, till the engine went south, just like yours-body was too banged up to make it worth fixing, though.

Apr 22, 2013 | 1991 Toyota Tercel

1 Answer

Can I repair a bad cylinder without taking apart the motor in a 2000 Monte Carlo?


Are you talking about compression readings? If so, and you only have 30 psi, engine is in serious state of disrepair. The cylinder head will have to be taken off to fix the problem-sounds like a stuck valve, a non sealing valve, or a blown head gasket. There's no way to get to it without removing the head.
Apparently you had a compression test done? If you had done or would do a leak down test of that cylinder, it would pinpoint the source of the problem-whether an intake or exhaust valve, or a head gasket, or piston or ring damage. With a leak down test, wherever the air is escaping from the cylinder points to the source: if for instance, air leaks out the exhaust pipe, you know it is the exhaust valve not sealing in that cylinder. If air leaks out the intake-it's the intake valve.
Air hissing from the oil dipstick tube would mean compression is being lost past the piston rings-going into the crankcase.

Feb 22, 2013 | 2004 Chevrolet Monte Carlo

1 Answer

Low compression


Could be burnt valves, bent valves, rings, gasket, scored cylinder walls etc... Need to do cylinder leakage test to find ut where the compression is being lost. Are you saying it has a new head gasket or are yu asking if that is the problem?

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2 Answers

Number 1 Cylinder loses Compression


Hi,
That means u have to replace the piston ring on that piston in the #1 cylinder or check the intake/exhaust valve, it might have problem in sealing the cylinder during compression! If you have done the compression test, those are the main problem of loose compression. The only way to check it is to remove the cylinder head.
Hope that might helps u out!

Jun 11, 2011 | Nissan Frontier Cars & Trucks

1 Answer

I have a 89 fullsize blazer i was on freeway an the truck lost all power burped an started running temp went 2 about 200 got off freewy did compression test #7 has 0 comp.did i blow the rings out or?please...


low compression in one cylinder usually indicates a bad exhaust valve. Low compression in two adjacent cylinders typically means you have a bad head gasket. Low compression in all cylinders would tell you the rings and cylinders are worn and the engine needs to be overhauled. If compression is low in one or more cylinders, you can isolate the problem to the valves or rings by squirting a little 30 weight motor oil into the cylinder through the spark plug hole and repeating the compression test. The oil temporarily seals the rings. If the readings are higher the second time around, it means the rings and/or cylinder is worn. No change in the compression readings tells you the cylinder has a bad valve. have a good day!

Apr 16, 2011 | 1989 Chevrolet S-10 Blazer

1 Answer

Lost compression


You may have a burnt valve or a stuck valve. Also the the compression rings on the piston maybe bad. I'd do a compression test on the cylinders. If you have a cylinder with a low reading, you can squirt some oil into the cylinder, and check the compression again, if it increases, it's probablly the rings are bad.

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