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Cylinders Ive already taken my grand am to a local mechanic and he told me that my compression was 75 and I will need a new engine. He said the engine would be $1,800. Will I need a new engine, if so should I just get a new car?

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  • THEONE239 Sep 15, 2008

    Ive already taken my grand am to a local mechanic and he told me that
    my compression was 75 and I will need a new engine. He said the engine
    would be $1,800. Will I need a new engine, if so should I just get a
    new car?

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SOUND LIKE VALVES BURNT OUT OR TIMING OUT,, ITS QUICKER TO CHANGE ENGINE,, OTHERWISE ENGINE NEEDS TO BE STRIPPED DOWN AND INVESTIGATED FURTHER..

Posted on Sep 14, 2008

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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.

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I was told that 1 cylinder in my 1995 Mercury has 0 compression..do I really need a new engine?


You need to remove the cylinder head & have it repaired,
not the engine

Why were your questions not answered at the repair shop?

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Compression


Not 30 or 60#

Those two are not within 10%

Do a Cylinder Leak Down Test

Leak Down tests tell you something about intake,exhaust,rings
& head gasket issues, compression on a good engine isn't
always listed, but no engine runs on 75 #


When you come to a web site provide some details
You don't even have an engine

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My 2001 Jeep Grand Cherokee started knocking. Multiple local mechanics determined it needed new motor. A "reman" motor was puchased ($3600) and installed. On test drive the car ran great then...


All I can say is do some research online find a REPUTABLE shop and let them drive it until it dies. Three things are needed for an engine to run: spark, fuel, compression. I doubt it is a compression problem being that it is a new engine. Something is causing either spark or fuel to drop out, a good mechanic should be able to quickly identify what is missing from the equation. Find a shop with a lab scope that can test sensors that send signals to the engine computer. It could be as simple as a fuel pump getting hot and quitting. Good Luck!

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The oil light coming on when stopped at a stop sign tells me your engine was already damaged before you had the power loss problem. I would not waste the 650 to put in an oil pump. You would be further ahead to just replace the engine.

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99 pontiac grand prix that is still mis firing even after we changed plugs and wires, not sure what to do now please help


Misfires can be caused by several things including all the parts you have already replaced as well as faulty ignition coils, faulty injectors, vacuum leaks and engine mechanical problems such as low compression.
With the proper equipment, injector operation can be verified by performing injector balance tests, where the operation of the injectors in the misfiring cylinders is compared to the other cylinders that are not misfiring.
Also, engine mechanical failures such as bad piston rings or leaking/burnt valves can be diagnosed with a simple compression test.
An easy (and very inexpensive ) way to verify ignition coil operation is to swap the coil from the misfiring cylinder(s) with the coil(s) from the cylinder(s) that is(are) not misfiring. Then clear the fault codes and drive the vehicle. If the same cylinders are still misfiring, the coil is not the problem. If the misfire moves to the cylinder that you swapped with - replace the coil.
Sometimes, injectors can also be tested this way, but on most GM V-6 or V-8 engines, this is not practical due to the labor involved in "swapping" injectors.

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Hi i have an 89 toyota camry its been leaking oil for a while but it never leaks on the ground or in any other fluids its not getting burned and its not leaking on the outside of the engine i...


If your not leaking externally your problem could be internal.Its quite possible your oil is going out your exhaust.I recommend you do a wet dry test on your cylinders.This test tells you whether or not you have an internal problem.What your going to do is perform a compression test on the cylinders and record the compression in each cylinder.This is the dry test.Now you want to squirt a little oil in the cylinder and do another compression test.If there is any variation in the readings from dry to wet then I would look for an internal problem such as valve guide seal,rings or valves.As far as the starter and ignition problem it could be a bad starter and ignition switch.You should take your starter to your local auto parts store and have the starter tested this is usually done for free.Also be sure you check your neutral safety switch for proper operation.

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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..

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My son needs a engine put in his 2004 grand cherokee laredo 6 cyl.. Trying to get a guestimate of what it might cost to replace it. He let the engine run out of coolant.


Hello penann, if your willing to shop around you should be able to locate a good engine with less than 100,000 miles for $500 or $600. ( most engines will go for about 250,000 miles if they're taken care of.)

The install, if you don't already have a good relationship with a local mechanic, I would talk to family, friends, and even coworkers to see who does the work on their vehicles. Quite often local mechanics would do a job like yours on the side for $300 or $400.

Trying to have it done at a dealership would get terribly expensive, and I'm not so sure that they would allow you to provide a used motor. You would most likely be looking at about $5,000 or more for a new engine and $1,500 to $1800 for the install.

Good luck my friend!

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