Fiat Croma 1.8 16v (Engine : Z18XER) Low compression
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    Default Fiat Croma 1.8 16v (Engine : Z18XER) Low compression

    Hi, I need your help ,
    The car was underlining , starting badly and so on. In the car there were changed rings, gasket under the head. After measuring the pressures, almost every cylinder had a pressure of 90 PSI. I read more about this engine and found that the valve clearances had to be adjusted. I found on the Internet what the valve clearances needs to be. I measured the clearance and on intake it was from 0.05mm to 0.13mm which is very little, on the exhaust were from 0.15mm to 0.25mm. I thought the pressure was leaking because of poor valve clearance, as it was practically ajar while compression was happening. On the Internet I found the range and ideal valve clearance. I let the valve taps grind down and put everything back together. This time there is very little difference ... Cylinder 1 - 90PSI, Cylinder 2 and 3 - 100PSI, Cylinder 4 - 110PSI ... Normally, the engine should have a pressure of about 200 PSI (14-16 bar).


    Any advice ?

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    What about EGR?

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    Quote Originally Posted by lukasSVK1 View Post
    it was practically ajar while compression was happening.
    How long has it been running like that?
    #burntvalves

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    Quote Originally Posted by autoden View Post
    What about EGR?
    Car is Petrol not Diesel , so I do not have EGR . Car is modified to run on LPG . But the LPG is not the problem.

    Quote Originally Posted by DiegoStud View Post
    How long has it been running like that?
    #burntvalves
    Well I bought this car in January 2019 , At that time car was going pretty well ... But it was firing from the exhaust . I think it was burning badly. In September the car started to underline really badly . Bad starts etc.
    So was running like month like this. We were scared to drive it so we just didnt drive it for a while. But there are no burn valves. Why ? Engine Head and valves were ground (or grinded ? Sorry for my bad English). That man who were grounding / grinding my Engine head showed me that there are no burn valves.
    Even In the car there were changed rings, gasket under the head.
    So I do not know what's happening. Now the car is starting pretty good and it's not underlining. But the power of 103kW(140 HP) is gone. Because of compression.

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    Quote Originally Posted by lukasSVK1 View Post
    Well I bought this car in January 2019 , At that time car was going pretty well ........Now the car is starting pretty good and it's not underlining. But the power of 103kW(140 HP) is gone. Because of compression.
    So it was running better before you took the head off? VVT mechanisms on these. Check your valve timing.

    Throttle open when testing compression?

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    Quote Originally Posted by DiegoStud View Post
    So it was running better before you took the head off? VVT mechanisms on these. Check your valve timing.

    Throttle open when testing compression?
    Valve timing is good, i think. But to be sure I will check it again.

    No .. , compression was tested without throttle.

    Thanks for your advice , will check Timing again and test compression with open throttle
    Last edited by lukasSVK1; 4th November, 2019 at 04:49 PM.

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    Was Banned For Being Certifiably Insane and Stupid

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    Gone quiet this one.
    Guessing it's got more compression than a Skyactiv-D

  9. The Following User Says Thank You to DiegoStud For This Useful Post:

    Meat-Head (14th November, 2019)

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    Sorry for my inactivity. Well I don't own Cylinder Leak tester. So I think It will be like this . :/

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    Well go buy one or modify your compression tester
    Was Banned For Being Certifiably Insane and Stupid

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    DiegoStud (14th November, 2019)

 

 

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