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ONE CYLINDER WITH LOW COMPRESSION - 2005 Volkswagen Golf

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Your question doesn't have a single answer to it unless you are more specific. Otherwise my advice is to do a leak-down test to pinpoint where you're venting the fuel mixture outside the combustion chamber.

Posted on Sep 07, 2009

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What should the psi compression be thanks.


It can vary between make and model of car. However, a general rule of thumb is that 135+ average is okay. Less than 85psi is pointing at something seriously amiss in the engine.

It can vary - some cars may have 125psi as 'average' compression.

Don't expect each cylinder to give the same compression reading as there will be a fluctuation. Another general rule of thumb is that there shouldn't be more than 10% variation between the readings. That is, if cylinder No1 is 135 psi, cylinder No2 shouldn't be less than '125 ish'.

If you suspect you may have compression issues, it's quite easy to do a bit of fault finding. Warm the engine first so that the pistons are expanded in the cylinders. Then do a dry compression (normal) test.

Here's some examples of compression tests on a 4 cylinder engine:
130 127 129 127

All compression readings are within 10% of each other. Fine.

Example 2:
95 95 129 127
Here, a low compression reading on cylinder 1 and 2 suggests a problem. It may be due to a faulty head gasket/cylinder head allowing compressed gases to be transferred via the defective head gasket from one cylinder to another.

Example 3:
130 80 129 127
Cylinder No2 has a problem. It's compression is way down. The other three cylinders are fine. So .. what is the cause of the low compression on cylinder 2? It could be a broken ring/cracked piston or a burnt exhaust valve.

This is where you do a second compression test - called the 'wet' test.

Squirt some light engine oil into each cylinder. Aim for the cylinder walls so that the oil can find its way down the walls and around the piston rings. Place a rag over each spark plug hole and spin the engine to expel excess oil.

The oil that you have sprayed into each cylinder will form a 'seal' around the piston ring. Do another compression test and note down the readings. Here's example 3 again:
Example 3:
130 80 129 127
.. with the low compression on cylinder 2.

If after carrying out the 'wet' compression test you have a reading along the lines of
130 100 129 127
suggests that the bore/piston rings in cylinder 2 are at fault. The compression has increased on No2 cylinder because of the oil forming a seal around the rings.

If there is no increase in psi on the wet test i.e
130 80 129 127
This suggests a burnt exhaust valve.

May 17, 2016 | Cars & Trucks

1 Answer

What causes misfires?


If the misfire is on one a particular cylinder or perhaps 2, these issues need to be addressed and checked...
1. Power to the spark plug.
2. Coils and spark plug condition.
3. Fuel supply to the cylinder
4. Air supply to the cylinder
5. Correct fuel/ air mixture to the cylinder
6. Cylinder compression. Low compression or a cylinder compression level below spec will result in a misfire. If the compression tester shows low compression in a cylinder the causes of the poor compression reading then need to be addressed.

The fault codes generated by the computer and read by an appropriate scanner will tell you which cylinder or cylinders are misfiring.

Nov 14, 2015 | Cars & Trucks

3 Answers

Cylinde 1 110LBS. LOW COMPRESSION CAUSING MISFIRE. WILL REPLACING PLUGS AND WIRES HELP?


What is the compression on the other cylinders, 110 lbs is low, however it is suffeint to fire so if the plug,coil and injector are working it should fire that cylinder

May 04, 2015 | 2005 Chevrolet TrailBlazer

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

I have a 99 sienna and the cylinders have low pressure what can i do?


If cylinder compression is too low, the car may not even start because of it. Have a shop do a compression test or a leak-down test to check the internal health of your engine. A good engine should have pressures of 150-200 psi in all cylinders and be close to each other. A worn or high mileage engine may have pressure as low as, say 125 psi, but if still balanced (close readings), would still run decent. Compression below that, especially below 100 psi, is serious trouble. ignition spark refuses to ignite the air/fuel mixture and you get a misfire-a non-working cylinder. Low compression can be caused by worn piiston rings or poor valve sealing. Low compression in 1 or 2 cylinders can be a valve problem, burned valves or valves not seating properly.
A leak-down test will check each cylinder and if there is a problem, the test will find the cause of the problem.

Dec 11, 2012 | 1999 Toyota Sienna

2 Answers

My 1999 Ford windstar acts like its going to die when stopped and dies when pulled from park to reverse...... mechanic just said its caused by the 5th cylinder. What in the cylinder is causing it?


If anything he ment cylinder contribution. # 5 is not contibuting,1999 windstar uses a waste spark system when a cylinder does not contribute it can be from no spark,to that cylinder to low compression. If its spark related spark plugs and wire will be needed . I am also going to say the coil pack why because your going from park to drive to reverse and #5 not contributing it affects #1 also.Now the compression.It cant contribute if the compression is low. If the compression is low you ll need to trouble shoot that area before you go any further.because a tune up cant fix a low compression

Apr 28, 2011 | 1999 Ford Windstar

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

Cylinder 1 idles rough and low compression


any cylinder will run or miss fire if the compression is low there are a few reasons what can cause low compression they are a burned or bunt valve, bad rings, a cracked cylinder wall or intake/exhaust seats a burned piston or a bad head gasket a leak down test will be more specif on witch you one of the following u have.

Dec 16, 2010 | Jeep Cherokee Cars & Trucks

1 Answer

2000 NEON NOT FIRING ON THE #1 CILENDER


#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.

Nov 08, 2010 | 2000 Dodge Neon

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

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