2014 E550 36k misfiring turn out to be dead #6
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Joined: Nov 2010
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From: Queens,NYC
2014 E63s 1993 mazda rx7 on Boost
2014 E550 36k misfiring turn out to be dead #6
It's a daily driver,babied...this is shocking at 36k.
Car just started shaking and CEL came on at a stop light.
Car just started shaking and CEL came on at a stop light.
Thread Starter
Super Member
Joined: Nov 2010
Posts: 746
Likes: 48
From: Queens,NYC
2014 E63s 1993 mazda rx7 on Boost
Low on compression #6
Turn of to be a valve guide issue. Was told excessive wear and will install new head. I request both heads replaced but that is a no go since the other has no damage.
I am not sure if its one valve or both intake or both exhaust that is damage. Car did not smoke or show any sign of guides going bad.I am not sure how a MB head is delivered with cams or not.Maybe the cam is the issue pushing the valve over off center...
I am not sure if its one valve or both intake or both exhaust that is damage. Car did not smoke or show any sign of guides going bad.I am not sure how a MB head is delivered with cams or not.Maybe the cam is the issue pushing the valve over off center...
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Thread Starter
Super Member
Joined: Nov 2010
Posts: 746
Likes: 48
From: Queens,NYC
2014 E63s 1993 mazda rx7 on Boost
Peter I want a tune on this car so bad but YES. Wrty...
I might get the car back Friday. Head is being installed (2 days) and 1 day of driving and testing. Waiting to hear if it is just the loaded head or a full head with cams they are installing. I was hoping for new cams...
Thread Starter
Super Member
Joined: Nov 2010
Posts: 746
Likes: 48
From: Queens,NYC
2014 E63s 1993 mazda rx7 on Boost
All done but somthing interesting I noticed.
note started OIL was found in all 4 of the cam sensors electrical connectors.
I am now thinking if this is true that maybe this was the main reason for the misfiring. After repairs oil was noticed inside the harness of hall sensor harness. I ask if a compression test was done before removal of the head...they did not have that information. The did test compression after the fix. Do these heads come loaded. The sheet is showing a list of every part needed a head assembly, valves for 8 intake/ 8 exhaust.
Now if it was the leaking valve when would the car run good for a few miles after a restart, compression should still be low and a misfire should be detected. The car does have a new head on it or a really good cleaning job on the old one. but now I am thinking if true it could have been the cam sensor leaking. I am going to check of the 14 550 and 14 E63 share the same PN for cam sensors. I have coverage will 75k so I am not worried...
I am now thinking if this is true that maybe this was the main reason for the misfiring. After repairs oil was noticed inside the harness of hall sensor harness. I ask if a compression test was done before removal of the head...they did not have that information. The did test compression after the fix. Do these heads come loaded. The sheet is showing a list of every part needed a head assembly, valves for 8 intake/ 8 exhaust.
Now if it was the leaking valve when would the car run good for a few miles after a restart, compression should still be low and a misfire should be detected. The car does have a new head on it or a really good cleaning job on the old one. but now I am thinking if true it could have been the cam sensor leaking. I am going to check of the 14 550 and 14 E63 share the same PN for cam sensors. I have coverage will 75k so I am not worried...
