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Has low compression on number 1 - 1996 Ford Taurus

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Bent valve, stuck valve, broken compression ring, washed out cylinder,

Posted on Jan 03, 2011


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Posted on Jan 02, 2017


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Low compresion in number 1 cylender can a bad fuel ejector cause this

injectors have nothing to do with compression
items such as head gasket , valves ( burnt , bent) , valve seat inserts, broken rings, scored cylinder walls , holes in pistons , blockage in air inlet --all have a bearing on compression pressures

Feb 09, 2018 | 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


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

No compression number 1 cylinder did the leak test on valve no leaks piston looks ok please help

There are 4 main possibilities:
- Bad Valve seats
- Bad compression rings
- Bad head gasket
- Bad piston.
If there is no compression as in ZERO on a compression test, I'd look for a stuck open valve or a hole in the piston.
A blown head gasket will give different symptoms depending on where it's gone. Look for water in the oil, low coolant level, pull the oil filler cap and look for water vapour.

Mar 04, 2015 | 2001 Chevrolet Malibu

1 Answer

Number 1 cylinder wear 2.5 chrysler?

you mean compression is low, right using tools?
and with added oil and not what is it. ?
doing the compression test.
oil last , and pressure rise is rings, else its valves.
low compression can not be fixed by wishes.
if the rings leak drive it
if the valves leak , it will get worse fast. fix it.
the tests are simple want to try? or just what?

Jul 26, 2014 | 1991 Jeep Wrangler

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

I check sparkflug while engine in idle, I try to take out sparkflug 01 and the idle sounds better also no. 04 but the sparkflug 02 , 03 the idle is more high to low

That sounds like your coil pack. The coil to number 1 & 4 may be bad. The other coil, to number 2 & 3 cylinder is good and working.
If it's not the coil, you may have to check the wiring to the coil pack-something is amiss. You could swap the coils around and see if the misfire follows your switch to 2 and 3...
If the above don't get no good results, it's not an ignition problem, then you will need to check compression on number one cylinder. Look for any mechanical problem from low compression. 3 major causes of misfires: gas, spark, or compression.

Mar 16, 2014 | 1996 Mitsubishi Eclipse

1 Answer

No compression in cylinder number 3

Broken or worn compression rings and faulty valves are normally the cause of low compression. I would suggest you take the vehicle to a larger reputable company for a second opinion to start with.

May 05, 2013 | 2004 Mercury Mountaineer

1 Answer

My 2005 Chevy Equinox LT has a number 1 cylinder misfire. I already had the spark plugs and wires changed. I also had the coil changed and it still misfires. I checked it with my OB2 computer, and it reads...

Have you done a compression check? I had the same problem on an S-10 Chevy pick up. Found that # 3 cylinder had low compression due to a burnt exhaust valve. No more problems after having valve job done on the engine.

Feb 16, 2011 | 2005 Chevrolet Equinox

4 Answers

My engine light came on. I went to Autozone to get a reading. It read PO301 3rd cynlinder misfire. So I put new plugs and wires. The engine light never went off. I re check the plugs and wires. But I kept...

Low compression can be caused by different things. And NO YOU DON'T need a new engine yet. You need to take the car to a repair shop that you trust and have them do more tests. A bad Valve will cause low compression and thats a lot cheaper than a whole new engine. A bad head gasket can cause low compression and that's cheaper than a new engine. You need to have the repair shop do what's called a "leak down" test. This is where the cylinders are pressurized one at a time and if they are losing pressure, the mechanic can pretty much tell you the problem. For example if air is coming out the exhaust, then the exhaust valve has failed, and if air is coming out of the intake, the the intake valve has failed. If it bubbles out of the radiator then the head gasket has most likely failed. Take it in and let me know..

Jan 15, 2011 | 2006 Dodge Stratus

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