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How to fix low compression in one cylinder on 4.0 engine

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  • 333 Answers

Take the head off and see what it is. Probably the valve. Or could be a weak valve spring. If so you may be able to change it out with just removing the valve cover. But not easy.

Posted on May 06, 2010

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Posted on Jan 02, 2017

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SOURCE: low compression in cylinder 4

When an engine has a cylinder with low compression it will be caused by a mechanical malfunction, and the reasons for low compression in a cylinder can be a bent or burnt intake or exhaust valve, or a valve that is not closing all the way because of a piece of carbon or an improper valve adjustment, the head gasket could be faulty around the compression sealing rings, or the cylinder head could be warped or even cracked, and the piston for that cylinder could be damaged with a crack or a hole, or the piston rings could be worn out or damaged.

The cause of the low compression can be determined without having to dis-assemble and inspect the engine by a "Compression Leak-Down Test" and a good repair shop or someone with a compression leak-down tester and a good air compressor can perform that test.

Posted on Jun 19, 2010

  • 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

bunnydawg
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SOURCE: low compression in #1and #2 cylinders 1993 eclipse gs 1.8l

burned valve is likely the culprit.... or bad rings.... hook air up to that cyclinder one at a time.... and listen where the air is escaping... be aware that the motor will rotate till the piston is at the bottom of it's rotation. if it's a burned valve you will have to remove the head and replace it but somewhat easier job then replacing the rings. darn almost forgot.... it can also be a blown head gasket.... same procedure but you might need a brush and some soap water to test for an air leak at the side of the head. when you are done spray some wd 40 on it to get the water off so the spark plugs do not arc.


Robert

Posted on Sep 26, 2008

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How to fix my honda civic it has low compression and week fire how u fix it


low compression can be either leaking head gasket-bad head /burnt valves--piston rings --damaged cylinder wall all of these are a tear apart fix a rebuild depending on mileage and condition of engine a replacement engine might be a better financial solution ---as for weak spark coil --wires-spark plug -fouled spark plug --and if same cylinder as damaged one the compression

Sep 30, 2015 | Honda Cars & Trucks

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P0302 cylinder 2 misfire detected


the problem is a sparkplug or wire you must be replaced

Apr 22, 2014 | 1999 Toyota 4Runner

1 Answer

Misfire on cylinder 4


How the computer determines a misfire is through a lagging effect in the crankshaft turning-when one cylinder is not producing power, the crankshaft doesn't turn as fast, and the computer senses it through the crankshaft sensor.
Misfires are usually a fuel problem, spark problem, or a low compression problem. Compare the spark at #4 with the other cylinders-all should have a blue, snapping spark. If good spark, check the spark plug -it might be defective. Compare the spark plug in #4 with the others. If it has a black sooty appearance, it is running rich-injector may be leaking. If the lower insulator on #4 is whiter than the other plugs, it is running lean, and the injector may be partially clogged, or not pulsing well.
If gas and spark is good, do an engine compression test. If #4 has low compression, it could be a valve problem, or worn piston rings, or a head gasket failure.

Mar 29, 2014 | Nissan Cars & Trucks

1 Answer

93 Ford Ranger 4cly. running rough and back firing out exhaust, has had a tune-up. Could the Mass Airflow cause this problem, no change in engine when unplugged.


Timing may be off. Have you checked it? Back firing could be valve timing problem; could also be too much gas-check injector spray pattern-should see a cone shaped pattern of fine mist on the throttle plates when cranking engine-this is if you have throttle body injection.
For $20-$30, you can buy a compression gauge tester and check engine compression. On a warmed up engine, pull all spark plugs, disable ignition and fuel delivery (pull injector fuse or unplug injectors), hold throttle wide open, and check compression on each cylinder by cranking engine over about 7-10 revolutions-the same amount for each cylinder, about 4-5 seconds each. All cylinders should be nearly even and balanced. Lowest cylinder should be at least 75% of highest reading cylinder. For any low reading cylinder, put a squirt of oil (about a tablespoon) in that cylinder and retest compression: if compression rises, rings are worn. If compression does not improve, valves are the reason for low compression-valves may be burnt or not sealing good.
I would do the compression test-on an engine that old, before putting expensive parts into it, you should know if the engine's internal mechanical condition is good first.

Oct 13, 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

2 Answers

Low compression in cylinder 4


When an engine has a cylinder with low compression it will be caused by a mechanical malfunction, and the reasons for low compression in a cylinder can be a bent or burnt intake or exhaust valve, or a valve that is not closing all the way because of a piece of carbon or an improper valve adjustment, the head gasket could be faulty around the compression sealing rings, or the cylinder head could be warped or even cracked, and the piston for that cylinder could be damaged with a crack or a hole, or the piston rings could be worn out or damaged.

The cause of the low compression can be determined without having to dis-assemble and inspect the engine by a "Compression Leak-Down Test" and a good repair shop or someone with a compression leak-down tester and a good air compressor can perform that test.

Jun 19, 2010 | 1983 Ford Ranger

1 Answer

P0304-cylinder 4 misfire detected and P0174-system too lean (Bank 2)


Check for a failed ignition spark plug wire, fouled or damged spark plug, possible vacumn leak around the area of the intak and #4 cylinder, also take a compression test of all the cylinders and hope they are all close to the same in pressures,like they all can be 125psi give or take 10%, if compression is low in a cylinder squirt a shot of oil in the low one and see if the reading comes up...comes up..its ring problems, no change possible valve problem, either way to fix this sort of problem the engine has to be torn down and inspected.
Happy Motoring!!

Jun 17, 2010 | Lincoln LS Cars & Trucks

1 Answer

#2 cylinde r head bad. how to repair low compression


First thing you need to do is determine why the compression in that cylinder is low. Four possible causes are 1. blown head gasket 2.bad valve(s) in the head 3. broken compression ring, piston ring land or burned piston. 4. rounded camshaft lobes
One other possibility is a fuel washed cylinder (from leaking injector)
You are going to have to remove that cylinder head and do a thorough internal inspection, possibly involving oil pan and piston removal.
Once the cause has been found you can proceed to make an appropriate repair. Or if the damage is beyond your ability, replace the engine with a used or new one.
There is no quick easy fix to restore compression.

Jun 09, 2010 | 2005 Chevrolet Colorado

2 Answers

Dose 80/70 psi [compression] mean the timing has jump


Certainly not good compression, and it could very well be timing jumped, especially if all cylinders are that low. If more questions please reply with engine size, and mileage please. Some engines allow you to confirm by removing top cover only.

Jan 16, 2010 | 1993 Ford Escort 4 Door

2 Answers

Low compression in a 1999 sunfire. will not start, does fire


There can be several causes for low compression.
Chck the obvious first. the spark plugs must be checked that they are all in good condition. not burnt, the gap must be good( for your engine).Check the wires and coil so that good spark is obtained. Blue spark , not weak yellow spark. After everything is good. Check the cylinders to see if they have compression. To test the cylinders do the procedures shown below.

If the cylinder shows little leakdown or holds good compression when a little oil is squirted into the cylinder (wet compression test), it would tell you that the engine needs new valve guide seals and/or guide work. Most late model import engines have positive valve guide seals. Often, the guides are fine, but the seals are worn or cracked. The seals can be replaced on some engines without too much effort and without having to remove the head.

compression test will help you determine if the oil is getting past the valve guides or the rings. If the cylinder shows little leakdown or holds good compression when a little oil is squirted into the cylinder (wet compression test), it would tell you that the engine needs new valve guide seals and/or guide work. Most late model import engines have positive valve guide seals. Often, the guides are fine, but the seals are worn or cracked. The seals can be replaced on some engines without too much effort and without having to remove the head.

finally if the rings on one or more of the pistons can caus compression leak. It must be located and fixed.

Mar 03, 2009 | 1999 Pontiac Sunfire

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