E60 530xi cranks but won't start
09-11-2022, 08:59 PM
#21
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To make matters worse after I replaced the o ring that was pinched out of shape, the leak got worse. Using the leak detection test again, I found out the crank case tube that connects behind the left side of the throttle body became fully disconnected to the manifold when I fixed the first leak! Removed the manifold a third time to connect this tube. Car ran like a champ.
09-25-2022, 06:30 AM
#22
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My Ride: BMW E60 530xi
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There's nothing major to disconnect but there are a lot of minor things. It's not necessary to pull the manifold completely out, but there's still quite a bit of things to disconnect. Double-check everything, as there might be something broken or not reconnected just right.
There's nothing major to disconnect but there are a lot of minor things. It's not necessary to pull the manifold completely out, but there's still quite a bit of things to disconnect. Double-check everything, as there might be something broken or not reconnected just right.
09-25-2022, 06:32 AM
#23
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Really sounds like large vacuum leak. Disconnecting MAF sensor works for minor leak, not large leak. I detected the leak by removing the air intake box sealing the intake tube with a latex glove, then removed the intake manifold pressure sensor, located between the 5th and 6th intake runners. Used this pressure sensor hole to blow air using an air pump hose with tapered end wrapped with electrical tape for good seal. If no leaks, the glove should inflate and remain inflated. In my case, it deflated within 5 seconds. I used soapy water spray to all the connections while slowly blowing, found out one of the o rings of the ccv tubes got pinched out of place when I moved the air intake aside when I replaced the starter.
09-28-2022, 08:56 AM
#24
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There are a lot of things that get moved / wiggled / bumped doing that job. FWIW, my quick no-brainer test for whether it's a fuel issue is to just shoot a couple seconds of starting fluid into the air box / tube, and see if the engine fires up immediately. If it does, you have a fuel problem. If it doesn't, keep looking.
Those hoses can be tricky to get fully seated and sealed - make sure you haven't left one loose. Might be interesting to listen to the injectors with a mechanic's stethoscope while a helper tries to start the car, to see if you're getting "signal" to the injectors.
Those hoses can be tricky to get fully seated and sealed - make sure you haven't left one loose. Might be interesting to listen to the injectors with a mechanic's stethoscope while a helper tries to start the car, to see if you're getting "signal" to the injectors.
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