Zero compression in one cylinder GL550. M273 engine
Newbie
Joined: Dec 2024
Posts: 3
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The bushings in the intake manifold wear and fall out. You can see them at the 6. picture, the small white parts. After 100-150k miles i would think about swapping the manifold. Pierburg manufactures the Manifold for mercedes, aou can get it direct from them for cheaper.
Newbie
Joined: Mar 2025
Posts: 1
Likes: 0
GL550
Compression loss cylinder 1
I have 2012 gl550 with 60k miles. Cylinder one has some compression issues at idle. Runs a tiny bit rough at idle and clears up at any speed. There are no lights on dash. Also, no loss of oil even at 5k miles between oil changes. Any ideas as what could cause loss of some compression in cylinder one. Some days are better than others.
Newbie
Joined: Sep 2003
Posts: 9
Likes: 2
From: Western Michigan
2014 GL550, 2006 BMW 330xi, 2007 BMW 550i (coming soon!)
If you wanna know what killed your engine, i can tell you.
I had EXACTLY the same damage (S211 E550). Bent valve at cylinder 5, zero compression, rocker arm broken, marks on piston head. Your Motor ate his intake manifold, the plastics. Small parts crush your spark plug head, i had this bevor, big warning sign. Big parts get stuck at the valves, boom contact. I repaired it at home without a lift, difficult but doable. You need some special tools and elbow grease. I took a gamble und didn´t pull the piston. The cylinder walls were very good for 250k miles, some minor scratches. Now the car is running fine for 10k miles, full power no oil consumption. All in all a 1000$ repair, the intake manifold is 500$ alone.
If you wanna see pictures, i got many.
I had EXACTLY the same damage (S211 E550). Bent valve at cylinder 5, zero compression, rocker arm broken, marks on piston head. Your Motor ate his intake manifold, the plastics. Small parts crush your spark plug head, i had this bevor, big warning sign. Big parts get stuck at the valves, boom contact. I repaired it at home without a lift, difficult but doable. You need some special tools and elbow grease. I took a gamble und didn´t pull the piston. The cylinder walls were very good for 250k miles, some minor scratches. Now the car is running fine for 10k miles, full power no oil consumption. All in all a 1000$ repair, the intake manifold is 500$ alone.
If you wanna see pictures, i got many.
I have 2012 gl550 with 60k miles. Cylinder one has some compression issues at idle. Runs a tiny bit rough at idle and clears up at any speed. There are no lights on dash. Also, no loss of oil even at 5k miles between oil changes. Any ideas as what could cause loss of some compression in cylinder one. Some days are better than others.
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