55 amg low compression ratio - Mercedes-Benz Forum
 
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post #1 of 2 (permalink) Old 04-10-2019, 06:30 AM Thread Starter
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55 amg low compression ratio

Hi guys, i recently bought cls 55 amg 2006 year, i did compression test after oil change was done 1000 km ago and sparks also. My readings are not good at all and im really confused 4 cylinders have around 120-130 psi ot 8.5:1 4 other hahe 100 psi ot 6.5:1 intresting is that the car doesnt smoke at all when do full throttle, the car was sold to me with catalyic converters removed thr car now hahe 2 errors for the 2 cats, can they cause this compression ratio? The car is brutal fast my last car was 400 hp diesel with less weight and now my amg is definetly faster than the diesel. However when i check the oil throught the sensor i got add 1 litrr after 1k km which is quite strange the readings on diagnostic tool was 61mm i have filled 1.1 liternoil and on the next morning the readings from sensor are still 61 i dont know if the car really burn oil or sensor is faulty, as i said no leaks trom car and when full throttle no smoke. I got no problem to revision the engine but want to know what may I expect

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Nikola Lefterov is offline  
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post #2 of 2 (permalink) Old Yesterday, 10:51 PM
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Originally Posted by Nikola Lefterov View Post
Hi guys, i recently bought cls 55 amg 2006 year, i did compression test after oil change was done 1000 km ago and sparks also. My readings are not good at all and im really confused 4 cylinders have around 120-130 psi ot 8.5:1 4 other hahe 100 psi ot 6.5:1 intresting is that the car doesnt smoke at all when do full throttle, the car was sold to me with catalyic converters removed thr car now hahe 2 errors for the 2 cats, can they cause this compression ratio? The car is brutal fast my last car was 400 hp diesel with less weight and now my amg is definetly faster than the diesel. However when i check the oil throught the sensor i got add 1 litrr after 1k km which is quite strange the readings on diagnostic tool was 61mm i have filled 1.1 liternoil and on the next morning the readings from sensor are still 61 i dont know if the car really burn oil or sensor is faulty, as i said no leaks trom car and when full throttle no smoke. I got no problem to revision the engine but want to know what may I expect

Regards


Too much oil will lower your pressure just as too little oil will do. AMG should have around 10-15psi at idle if your pressure is lower check if you have any oil leak from the block. Cats do not influence oil pressure. If no oil leak you should check the rubber oring at the oil pickup (drop the oil pan -check youtube)


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