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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 09-25-2014, 02:48 PM
straysaver straysaver is offline
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Location: Virginia
 
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Mein Auto: 1995 325iS
95 325is with CEL code 1215

I just installed a new battery in this car and now the CEL is giving a 1215 code. And, the engine struggles badly and even spits out something very close to a backfire.

Does anyone have any ideas about whether the cause for this code is somehow related to the battery change? It certainly is a big coincidence.
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  #2  
Old 09-25-2014, 03:06 PM
Jakobie1086's Avatar
Jakobie1086 Jakobie1086 is offline
Just a kid with a toolbox
Location: Doylestown PA
 
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Mein Auto: 330ti
Quote:
Originally Posted by straysaver View Post
I just installed a new battery in this car and now the CEL is giving a 1215 code. And, the engine struggles badly and even spits out something very close to a backfire.

Does anyone have any ideas about whether the cause for this code is somehow related to the battery change? It certainly is a big coincidence.
Check your battery voltage when the car is off. Should be around 12v-12.5v. Then check the voltage when the car is running. Should be 13.5v-14.2v. Assuming you get these numbers, your issue has nothing to do with the battery replacement.

Sounds like a bad vacuum leak. Spray 2+2 or carb cleaner or similar aresoal around your intake and various vacuum lines and gaskets. If the idle clears up or changes, locate that area which is where the vacuum leak is. Youtube can show you examples of people doing this. It's not impossible that a sensor like your MAF just went bad; but it's unlikely to be that sudden. Not a bad idea to spray some MAF cleaner in your MAF if you have it.
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1995 Hellrot Red 318ti - 100% Rebuilt Chassis/Motor M50 3.0 Stroker

1992 Black 325i 5 Speed w/ 279k - Parted out
1998 Black 328i 5 Speed Restored w/179k - Sold
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1992 White 325i Auto - Lemons race car
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  #3  
Old 10-16-2014, 03:47 PM
straysaver straysaver is offline
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Location: Virginia
 
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Mein Auto: 1995 325iS
Does anyone know of a source for a 3D diagram of the vacuum hoses for this car? Would be helpful when running down the problem. Since the car is almost 20 years old, I'm thinking about replacing all of the hoses.

Also, I disconnected the MAF and there was no change in the way the engine is running (poorly). Does that tell me that the MAF is not the problem?
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  #4  
Old 10-21-2014, 01:51 PM
straysaver straysaver is offline
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Location: Virginia
 
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Mein Auto: 1995 325iS
Maybe one more piece to the puzzle today. Went to check on the vacuum leak and, as usual, the engine is revving up and down repeatedly and mildly backfiring. Seems to want to really take off and rev at a high level.

Saw one thing that I hadn't noticed previously. While all this is going on, the mpg indicator goes off the scale in the direction of single digits. Does that provide any additional clue to what might be going on? Is that typical for a particular type of failure?
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