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Low compression - 1991 Volkswagen Jetta

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Your piston rings probrally need replacement

Posted on Jul 12, 2009

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Can a low compression PSI on one cylinder cause the computer to indicate "miss fire" on that cylinder?


How low is low? Low compression is really vague as a diagnostic method. The issue could be leaking valves, head gasket, or rings. Yes if it is losing a lot of compression then there is no fuel to ignite and it would be a misfire.

Jul 13, 2015 | GMC Envoy Cars & Trucks

1 Answer

Why does my 2006 Statesman 3.6 V6 turn over and fire occasionally but won't start?


Low compression can mean any of several causes:
loose plugs
bad valves
bad rings
blown head gasket
there are a few even worse possibilities.

Do a compression test. if compression is indeed low, have a mechanic look at it.

Apr 21, 2015 | Cars & Trucks

1 Answer

# 1 cylender not firing,low presure in that cylender,not buring oil


Low pressure I'm assuming you mean low compression. Do a "wet test" first. If compression is still low, check your valve adjustments. tight valves will cause low compression. Also has this engine been overheated badly,or have excessive mileage on it? Could be a head gasket, or damaged rings/cylinders.

Apr 07, 2014 | Honda 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

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

1 Answer

Low engine comoression on alfa 91spider


Gates, the compression could be low for multiple reasons. A common one is a leaky head gasket. Do you have low compression on all cylinders? Are compression readings the same for each cylinder? How did you test the compression?

Let me know the answers to the above, and we'll see if you can narrow the possibilities.

Sep 26, 2012 | 1991 Alfa Romeo Spider

1 Answer

Very low compression in the #4,6 and 6 cylinder


Low compression is likely indicating excessive cylinder wear, and worn out piston rings. If the engine is using (losing) coolant, then check for a bad head gasket. If you could post type of engine, and other symptioms (oil usage, backfiring, etc..) I could help more precisely.

Aug 12, 2012 | Chevrolet Chevy 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

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

69780 milage engine turns low compression,what could cause low compression


hello there:
low compression could be caused by having bad rings and or bad valves probably the best thing to do would be to replace or rebuild the motor hope this helps you out...

Jun 08, 2010 | 2001 Saturn L-Series

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