Question about 1996 Nissan Maxima

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NO COMPRESSION ON # 2 CYLINDER - 1996 Nissan Maxima

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Valves could have carbon build up causing them not to seat properly, when turning it over listen to intake for air movement, if not then possible bad rings

Posted on Jan 03, 2013

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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

1 Answer

Why is there a cylinder 2 misfire?


Check these three things in the misfiring cylinder: spark, gas, and compression. One of them is wrong or missing. For spark check the spark plug and wire. Make sure you have spark on the plug wire, a strong blue spark. For gas, the fuel/air mixture may be wrong. Does the fuel injector pulse, putting gas into the cylinder? Possibly you may have a leaking injector or a clogged injector.

If gas and spark seem okay, you need to check compression in the cylinder. Low compression will cause a misfire. If compression is 20 or 25% lower than adjacent cylinders, that could be causing a misfire. For example, say numbers 1 and 3 cylinders had about 150 psi compression. 80% of 150 = 120, so if cylinder 2 is 120psi or less, that could be setting the misfire code. Low compression can be caused by valves not seating well, or bad piston rings, bad head gasket- something in the combustion area of the cylinder is losing compression.

Aug 17, 2015 | 2006 Mazda Tribute

3 Answers

I have a xc90 04 model with a 2.5 L 5 cylinder the code PO302 mise fire I did a full tune up coils , plugs ,but the number 2 cylinder is not firing . I swap coils still no fire . Checked wires and gr


if you have spark at the plug on #2 then check the injector for voltage and ground you may have a bad injector or plugged or dirty injector. it could also be a vacuum leak at the intake were it meets the head at cyl#2.

Oct 03, 2014 | 2004 Volvo XC90

1 Answer

No compression in rear cylinder


You are showing 2 different problems, no compression in any cylinder and no compression in rear cylinder.

Going with no compression in any cylinder, if the camshaft is not turning you should not have compression in most cylinders. If one cylinder has both valves closed you may have some cranking resistance. Your timing chain or gear is broken. Look if you can at any openings for a PVC pipe in the valve cover or oil fill cover on the valve cover.

There is a chance you can see some valve rocker arms and if they are moving when the engine is cranked. Otherwise you will need to remove a valve cover to observe the rockers.

May 13, 2014 | Ford Taurus X Cars & Trucks

1 Answer

Cylinder compression


Pour in a teaspoon or 2 of heavy engine oil through the spark plug hole of that cylinder, and remeasure compression. If it improves, you probably have a broken piston ring. If not there is likely a burned valve seat or a leaky head gasket by that cylinder. Further diagnosis will lead to removal of the head.

Jan 19, 2014 | Cars & Trucks

1 Answer

No compression in cylinder 2 mk 4 golf gti


If you are sure the compression is low on that one cylinder (might want to get a second opinion) the most likely problem is a burnt valve.
That will require taking the head off and having it "rebuilt". $$$
Second most common problem is something wrong with your piston rings. That wil require an engine overhaul. $$$$$$
Here's how to tell before you tear the engine down.
With your compression gauge handy, get an oli can with some motor oil ready. You'll need about 1.8 cup or six tablespoons full.
Check the compression without the oil, write it down.
Add or squirt the oil in the cylinder, and check the compression again.
If the compression comes up with the oil added, the problem is the rings on the piston. If the compression stays the same, it is a burnt valve.
There is a small chance it could be a leaking head gasket.

Jan 19, 2013 | Cars & Trucks

1 Answer

No compression in cylinder 2 and 3


SORRY, BUT NO COMPRESSION IS ENGINE OUT TIME, BETWEEN 2 CYLS IS PROBABLY HEAD GASKET

Aug 19, 2012 | 2003 Ford Focus

1 Answer

Engine stalls randomly engine code for ignition module group b, and misfire in cylinder 2 (302). changed sparked plugs problem got worst


Misfire means...spark plug is not working or you have a loose compression on cylinder. 2. Have the cylinder 2 test for compression and advice.

Oct 07, 2010 | Cadillac Seville Cars & Trucks

2 Answers

95 Jeep Cherokee 0 compression in #2 cylinder.


If you have a 0 reading from cylinder 2 that means there is no compression from it and you need an enfine rebuild.It seems that there had been damage to the engine.Have it hooked up to a computer and check diagnostic code.Overheating of an engine can be very costly and damaging, rememeber that always.

Jul 01, 2009 | 1995 Jeep Grand Cherokee

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