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General BMW Model Discussion
All non E46 BMW model questions in here. Look below for E36, E90 and F30 specific forum. For additional model specific forums check out bimmerfest.com!

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Old 05-15-2010, 04:58 PM   #1
terrymckitrick
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Join Date: May 2010
Location: St. Albert, Alberta Canada
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My Ride: 1994 325ic
Mass air flow sensor exploded

I was driving down a ramp into an underground parking garage yesterday when the oil light came on, and a few seconds later, here was a loud noise about the same volume as a shotgun blast, there was a burning smell, and the car stopped running. I coasted into a parking spot and checked the oil (it was full). Engine temperature was normal right up to that point. The car would start, but would not idle. I didn't try reving the engine, as I was afraid of hurting it. The car was running perfectly up to that point. It would occasionally surge slightly when cold, varying between 600 and 1000 rpm, and was slightly slow to return to idle, particularly when cold, but had never stalled before. I had it towed to a repair shop, where the problem was electronically diagnosed to be the mass air flow sensor. I have never heard of any sort of sensor exploding. Is there something more sinister going on here?

Terry McKitrick
1994 325ic

Last edited by terrymckitrick; 05-15-2010 at 05:20 PM.
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Old 05-16-2010, 01:33 PM   #2
NaZty NaZe One!
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crazy..i bought an aftermarket MAF meter hoping to replace my old one. but ive been getting some issues for example when comming to a stop the car shuts off. anyone got an idea what it might be? im assuming the MAf meter. as it wasnt happening before i replaced it.
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Old 05-17-2010, 01:45 AM   #3
MUNDA
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It sounds like your carr backfired unburnt fuel?
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Old 05-20-2010, 05:24 PM   #4
BreakMyWallet
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Quote:
Originally Posted by NaZty NaZe One! View Post
crazy..i bought an aftermarket MAF meter hoping to replace my old one. but ive been getting some issues for example when comming to a stop the car shuts off. anyone got an idea what it might be? im assuming the MAf meter. as it wasnt happening before i replaced it.
cam pos sensor
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Old 05-24-2010, 02:29 PM   #5
terrymckitrick
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Location: St. Albert, Alberta Canada
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Mass air sensor/air tube.

The problem I had was the mass air flow sensor. When it went, there was a backfire which took out the vacuum hose to the manifold. I replaced both the hose and the mass air sensor. The car now runs fine, but my mechanic warned me that the adaptor for the air tube is broken, also need replacing. My check engine light is on, and the code is for the mass air sensor, which is new, so it is probably originating from the air tube. Apparently this part only comes with the intake assembly, and is expensive. Does anyone know where I can get this without the full assembly?
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Old 05-25-2010, 02:02 AM   #6
komet
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I had ecxactly the same thing happen to me the other day, driving along then bang like a gunshot, was the maf sensor, replaced it all good, didnt blow any air hose though.
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Old 05-28-2010, 08:21 PM   #7
terrymckitrick
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The check engine light went out and has stayed off for a few days. Hopefully everything is o.k. now.
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Old 07-02-2010, 09:17 PM   #8
Shawn90gt
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My car when I bought it had the tube behind the mass air flow sensor was ripped which I knew. It had a K&N filter, and my mechanic said to change that because it was damaging the mass air flow sensor. Well, what he didnt mention was the intake tubing was missing, and since I have realized this what can I do? I mean there is no tube for the air to go into the air flow box, but an open hole, so anyone got any ideas? The car ran fine for a month when I got it, and then died one day took it to the mechanic and he cleaned the sensor and replaced the ripped tube, but still didnt mention the intake tube was missing. The other night it died on me so I have a car that wont build up rpms over 1500 now, and wont idle or anything else, so is there anything you guys can offer to help me? It's a 330CI 2001. It's a beautiful car, and ran fine until this recent event the other day. I bought it knowing it needed a new valve cover gasket, and belt, and the one tube he mentioned. So how important is the other tube, and any help you guys could offer on what the problem is would be great is the sir flow sensor dirty again so quickly because it is missing the intake tube or what? I read about the fuel filter being replaced on one of the other threads, and bought a filter and plan to tackle that tomorrow. I just finished cleaning the air flow sensor and I waiting on it to dry now and see if that helped the problem, and if so does this mean it was just the mass air flow sensor or what? Also, so should it be happening every two months or is that just because of the missing intake tube? I replaced the K&N with a wick air filter, and I was about to upgrade the chip in the car and do some other performance upgrades, but I am afraid to if this is going to be more then small mass air flow sensor and fuel filter replacement then I dont know if I want to go through with it. If it helps I was driving down the road and went through a puddle of water and it splashed water all over the car and it drove another thirty minutes and started idleing funny and died. Then it would start and idle okay but wouldnt rev over 1500 rpms. Now it won't start or if it does it dies quickly. Anyhow, please any insight would be great.
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