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Old 09-23-2019, 03:58 PM
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huge backfire, blew out exhaust and intake

I started my 2004 X5 the other day and there was a huge backfire. The engine got very loud, like a hole in the exhaust and ran extremely rough. I shut it off. It barely starts now, no power and lots of popping. The car has fault codes 19, Ignition Coil, Cyl #1, 5E, EVAP large leak and EC, CAN timeout EGS. There weren't any symptoms before this. The intake manifold is cracked and opened up all along the seam. Any suggestions? I pulled ignition coil #1 to see if it was causing the problem. The car wouldn't start. The engine is the 3.0L six. The car has 160,000 miles on it. I'm trying to figure out if it is worth fixing.
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Old 09-24-2019, 04:10 PM
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How much time elapsed between when the engine was previously shut off and when you started it and it backfired?
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Old 09-24-2019, 04:47 PM
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It was only a few days. It was running fine before it happened. I just pulled the intake manifold off another '04 X5. I need to check the injectors before replacing it.
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Old 09-24-2019, 07:45 PM
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A backfire that cracks the intake manifold would require lots of fumes/fuel. Did the engine crank over for some time before it started and backfired?
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Old 09-24-2019, 07:48 PM
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It backfired within seconds of turning it over. Could a fuel injector get stuck open?
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Old 09-24-2019, 07:50 PM
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Before it started or just after the engine started running
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Old 09-24-2019, 07:54 PM
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Trying to get the details from my wife. She said it was running for 2-5 seconds before backfiring. It continued to run poorly, loud due to the hole in the exhaust, for 5 or so seconds when she turned it off.
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Old 09-25-2019, 08:24 AM
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With a backfire through the intake manifold you most likely have a crack or a hole in the manifold. This was a very common occurrence on a 911 with the CIS intake system. Only fix is to replace the manifold.
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Old 09-25-2019, 09:30 AM
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The intake manifold was split down the seam. I've already pulled one out of another X5. But I still need to find what caused the backfire. I also have to fix the hole in the exhaust that was caused by the backfire. The backfire blew the intake and exhaust at the same time.
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Old 09-25-2019, 11:55 AM
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Sure you didn't drop a valve?

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