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I need to know the correct p.s.i. for a compression test on a1975 998mini

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10,5 BAR

Posted on Mar 21, 2011

  • barry corrin Mar 21, 2011

    Sorry psi 150/155



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1982ft500 running rough in 2nd gear, Fouling plugs, misfire once in a while. Just had carb rebuilt

you need to do a compression test, just to check the compression it could be a sticking vale or something else, could be a number of problems just mixed into one. fouling plugs can be the carb is not set correctly, too much fuel, this would foul the plugs and cause misfire. but would check compression as it can be its correct but the compression is low.

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if it was a bent valve compression would not be the same on all cylinders. you need to go over every thing you did to make sure connections are tight and correct with electrical, vacume, and fuel.

Aug 06, 2014 | 2011 Ford Fusion 2.5

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Did all the things you suggested including new tires! compression test would show valve problemm

compression tests identify problems with---head gaskets --- cracked heads , blocks--- valves not seating correctly---worn rings ---cracked pistons--- and general condition on the engine

Jan 07, 2014 | 1998 Cadillac DeVille

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Correct engine compression test results

There are no "correct" numbers for compression tests, as actual compression depends on many variables. The important thing is that it is not crazy low (less than 110 psi approx) and that all cylinders measure within 10% of each other (approx). Tests should be done with throttle held wide open and all plugs removed. Crank engine about 5 revolutions for each test. Comprssion should slowly build to max reading.

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Compression pressure

I would do a cylinder leak down test

Then you know if the intake valves,exhaust valves
& rings are good

Also get some idea if your timing is correct, if you
do it using a transducer & software ,verses a gauge

Compression isn't usually in print & you just need a comparison
between cylinders,if they don't leak they should be good

You start with a 5 min cylinder balance test, using an amp
clamp on a battery cable, then decide if doing either of the
above tests is necessary

Mar 16, 2013 | Toyota Pickup Cars & Trucks

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Mapsensor was the problem they stated then the say the number 3 plug was misfire and comp is 50psi on 3 cylinder needs engine?

wow your in for a bill.first compression test needs to be done when the cylinder is TDC(top dead center).your be shocked how many mechanics dont know how to do this.i run into a few.compression that low head gasket blowen.need to replace if comp is at 50psi correct.get a second option and check.usually its misfiring because compression,inigition modular,wire bad internal or connection,spark plug.or fuel injector.get a second option or you going to the bank on this one.compression first check.

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1 Answer

It is running really rough determined running on 2 cylinders

well start with a compression test to make sure it isn't a mechanical problem. If compression test results are not what you were hoping for the a cylinder leakdown test will be necessary to find out if you have burnt valves or excessive blowby from piston ringsb that are not sealing correctly due to being broken collapsed or scored cylinders., or head gasket failure. If compression test is good the you need to determine if your injectors are the problem or coil pack, spark plugs or wires. More info would be great if you want a better answer. Like how do you know its only hitting on two cylinders ? How many cylinders does it have to start with ? Model year , little things like that.

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Timing belt continued

It depends... I know that for sure, the serpentine belt that drives your accesories would not cause any signifigant differences in your compression upon testing. I'm pretty sure you are referring to the timing belt... and i'm assuming that the motor in the car is the 2.2l l4. If you have any documentation on the compression test, normal compression readings would be about 9.5.1 and that would be at 16 degrees TDC. (that's where your timing marks should be on the cam gears.) If you are getting low compression (lets say 3.5.1) on your read-out, then that means that your timing is definately off. This would not nessecarily mean that the car would not start. It would try to run, catch, or run a bit and hesitate... then die on you. Basically, that just means that you need to have the timing adjusted. If you wanted to self check and make sure that the belt is in ok condition, remove the spark plug wires, and unbolt the valve cover. Remove it and examine the belt for frays or damages.

If the belt was bad or not functional at all, your compression readings would be really high (given that your piston rings are in good shape, and your valves were seating correctly and not damaged) But yes, there would be a signifigant difference, and it would be safe to say that in the instance of really high compression that a malfunctioning or broken timing belt would be the culprit.

Did your son drive it to the shop to have it tested? or was this after the no start problem?

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1 Answer

Firing order, 1990 Pontiac Grand am 2.5 l, 4 cyl

Its 1342 or 1432 To guarantee correct firing order take plugs out and place your finger/thumb over the plug hole so you can feel the compression cycle.Have some one flick the key on and off slowly .As soon as No 1 has done its compression cycle the next cylinder to compress will be in the firing order.You only need to test 2 clinders to tell you which one of the two firing orders ive given you.good luck and let me know how it goes

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