Low conpression

Skylope said:

Agreed however it sounds like the owner may not have the funds to rebuild.If the compression doesn't go up it may be a valve issue.

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And the best way to know that is to do the wet & dry compression tests PROPERLY.

All we're trying to do at this point is to evaluate the condition of the engine, when that has been done, then he can make an informed decision as to the way forward.

s0ufi4n said:

What do you mean by the o/p confirmed engine timing ?

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The engine has valves that open & close to allow air/fuel into the cylinders, and exhaust out, if the valves open or close at the wrong time, the compression numbers can be lower than normal - incorrect valve timing CAN cause low compression numbers, BUT, given the variation between the cylinders that you have reported, it is UNLIKELY to be the cause in this particular case.

A PROPERLY DONE wet & dry compression test is the first step into an evaluation of the engine's condition, not doing it and hoping for a different solution or a quick fix is just wasting time.

The sooner we get those numbers, the sooner we can help you find a way forward.

s0ufi4n said:

Hello guys, I'm facing a really bad situation.herw with a used grand vitara 1.6 normal engine that I've recently bought "used". The problems are: hesitation in starting!, Vibrations with low rpms on 2d gear, lack of power on uphils - Have turn to lower gears yet it strugles to finish the task. I've changed all oils and liquids in the car the day I bought it and also a worned clutch. The last thing I did is co pression measurement and I ended with the following measurments:
Cylinder 1 : 125
Cylinder 2: 115
Cylinder 3 75
Cylinder 4: 100
One other thing is that the car is gasolic 13L/100kms on very light feet!
I really need help.
thanks in advance

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It sounds to me as if you have a fuel injector problem on cylinder 3 and 4.

tazmaniac37752 said:

It sounds to me as if you have a fuel injector problem on cylinder 3 and 4.

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Let's assume, for the purpose of discussion, that you're correct - bearing in mind that the FSM states the lower limit on this engine (M16a with VVT on the intake) is 156.0 psi - what do you think is causing the "lower than acceptable" compression numbers in cylinder 1 & 2?