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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 12-20-2013, 04:59 PM
mr280zxt mr280zxt is offline
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Question Engine Swap question

I have 2003 325i with blown head gasket. After machined the head, we discovered block threads were gone as well. Using time sert didn't work and we decided to change the engine. And I found 2001 325I engine. My mechanic installed the engine and everything fit like it was supposed to, including all connectors, nuts and bolts...

Problem is, now car cranks fine but, there is no spark....He has been on it last couple of days with no success. Some BMW shops told him, "no spark,because engine is from different year"...I had a hard time believing that...could that be true....?....Any suggestions on what to look for.?...Your help is greatly appreciated.
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  #2  
Old 12-20-2013, 05:17 PM
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floydarogers floydarogers is offline
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Should be a straight drop-in. If there's a problem with spark, it's not the engine, but the ECU and associated electronics. Might be a loose connector to the crankshaft/camshaft position sensor (or something else) that is putting the ECU in safe mode.
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  #3  
Old 12-30-2013, 01:37 PM
mr280zxt mr280zxt is offline
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Still NO Spark

Thank you....
Car is still down with NO Spark..Mechanics are scratching their heads.....Any other opinions on whether being 2001 engine into 2003 car create no spark problem?
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  #4  
Old 12-30-2013, 02:22 PM
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MalibuMafiaV MalibuMafiaV is offline
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Quote:
Originally Posted by mr280zxt View Post
Thank you....
Car is still down with NO Spark..Mechanics are scratching their heads.....Any other opinions on whether being 2001 engine into 2003 car create no spark problem?
Year shouldn't matter at all as long as it's the same engine you had before. If it isn't then you will have to reprogram the ECU which is easily doable with an Autologic computer. You can use the Autologic to also diagnose why there's no spark and it should tell you why there isn't.
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  #5  
Old 12-30-2013, 04:13 PM
Bird-Dog Bird-Dog is offline
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I think your mechanics are faulty. Did you go to a shop that specializes in BMW's? If not, maybe YOU should. If so, maybe THEY shouldn't.
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  #6  
Old 12-30-2013, 05:02 PM
mr280zxt mr280zxt is offline
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Thank you guys...

BIrd-Dog, what do you mean by "mechanics are faulty"...you mean Engine is not compatible?

He is not BMW specialized, but he is a darn good mechanic...I personally saw him working on many Beemers over the years...

He is leaning toward re-flashing the ECU....
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  #7  
Old 12-30-2013, 05:15 PM
Bird-Dog Bird-Dog is offline
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Quote:
Originally Posted by mr280zxt View Post
Thank you guys...

BIrd-Dog, what do you mean by "mechanics are faulty"...you mean Engine is not compatible?

He is not BMW specialized, but he is a darn good mechanic...I personally saw him working on many Beemers over the years...

He is leaning toward re-flashing the ECU....
I mean you need a technician working on your car that knows BMW's more thoroughly.
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  #8  
Old 12-30-2013, 05:20 PM
mr280zxt mr280zxt is offline
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Got it..sorry...I misunderstood...
We will try to re-flash the computer. If that doesn't fix the problem, then I will have the car towed to BMW dealership for diagnosis...

In the mean time, please keep your suggestions coming....
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  #9  
Old 12-30-2013, 08:36 PM
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smolck smolck is offline
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Re: Engine Swap question

2001 had square coil packs, your 03 should have the round ones (no bolts needed). The valve covers are different as a result because the square ones bolt down.

Swap valve covers from your old motor

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  #10  
Old 12-30-2013, 08:50 PM
mr280zxt mr280zxt is offline
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I swapped the valve cover already...Using the one from old engine....Do I need coil packs swapped as well?
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  #11  
Old 12-30-2013, 10:10 PM
chansta chansta is offline
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first off autologic isnt going to tell u the solution like malibumafia says unless it sets a code for ews alignment. i use autologic everyday.

secondly take it to a technician not a mechanic. i'd offer solutions but i dont like guessing second hand without the vehicle with me to diagnose.
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Old 12-31-2013, 07:28 AM
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Quote:
Originally Posted by mr280zxt View Post
I swapped the valve cover already...Using the one from old engine....Do I need coil packs swapped as well?
Again, in 2003, depending on the month it was made, your car could have the same coil packs. And besides, if it had different ones, they wouldn't have plugged in anyways.

I am sorry, it was a guess and I guess that isn't your problem.

Did you by chance remove the DME relay and forget to reinstall?

Another place to look is the crank sensor. Without a working one, the car will not start. Crank sensor tells the engine when to fire the plugs.
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now, go burn your Man Card, and buy yourself a Camry....
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  #13  
Old 01-08-2014, 09:28 AM
mr280zxt mr280zxt is offline
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Resolved the issue

Well....Resolved the issue but still puzzled...

After so much troubleshooting, mechanic found blown fuse....after tracing the fuse on where it goes, he found out it goes to secondary air pump for smog...He removed the connector from air pump and replaced blown fuse and we have SPARK....

I am puzzled, because, we had spark before we replaced the engine...This pump was hooked up and there was no blown fuse there...I can only imagine, we shorted the wire somewhere during engine replacement....But why air pump electrical issue should cause no spark, just puzzles me....

Just wanted to keep you folks updated.....thanks for all the suggestions...
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