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#1 (permalink) Old 09-14-2004, 07:34 PM
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I have a 325i with the Dinan intake with the aqua sock. I drove through some deep water during a flood (I had not choice). The car stalled out and I finally got it started and out of the water. After getting out of the water the car started to run rough and the Service Engine Soon light came on. After several days of not driving, I drove the car and it ran OK (light still on). The light then went off a day later. Car ran good for a few days then the light came back on and started to run rough again. After a day the light went out and the car ran good. Ran good for a day or two then the light came on and ran rough.

I took the car to the dealer and they tested out what could be wrong. They are saying that the 4th cyclinder has a bent rod. Possible cause is water in the engine The solution is to replace the engine. The dealer says the only way to tell if the rod is bent is to open up the engine (12 hr job) and see. Still may have to replace engine if rod is bent.

What I do not understand is why a amber Service Engine Soon light would come on with a bent rod. I would think that a Red light would come on to stop the car now. I looked in the manual it says that the Service Engine Soon light is an emissions problem that needs to be fixed but not immediately.

Any thoughts on what this might be?

Thanks for any help.
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#2 (permalink) Old 09-14-2004, 08:28 PM
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that doesn't make sense. if the rod is bent then why would you get off and on performance? i would assume it to be rough constantly as you use all cylinders at all times while driving.

i have no suggestion on what it could be as i don't know enough of the workings of the engine to suggest anything, but from logic that excuse just sounds like a way for them to charge you some big bucks.

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#3 (permalink) Old 09-15-2004, 01:06 PM
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Ill give you my experience with what seems the same symtoms. I accidently misshifted from second into 1st instead of 3rd at about 6800rpm. Well you can imagine how that felt, but anyway, the check engine light was on and the car was running very rough, couldnt get over 30mph. Well I limped it home and the next day I started it and it was running fine. I drove it for a while with the engine light on and eventually it was running rough again, I would let it cool down, restart it and it would seem fine. After a few days of this I finally brought it to the shop. They said they would have to pull the engine apart to find out why, so $2000 later they found bent valves (not rods) but I would assume it would have the same effect if it was the rods. They told me that the computer would compensate for the compression loss and runn either lean or rich deppending on what it needed to stay running, well after so long of that the computer couldnt handle that and would actually shut those leaking cylinders down and that when the rough running would start. I had the valves replaced and the I ended up paying over $3000 for the job. If you are paying out of your pocket I woul dhave them replace the rods rather then the engine, I mean unless the block itself is damaged why would you need a whole new engine? That would only be easier for the shop. If its under warranty, well then I would definately go for the new engine. Let me know what happens, I would like to know for future ref. Thanks

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#4 (permalink) Old 09-15-2004, 08:02 PM
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I had a chance to speak with the mechanic today and he was able to help explain. Since the compression is not what it should be on one cyclinder they feel it is bend rod. They did a lot of test and this is what they feel is the problem. They say that the cyclinder is damaged due to the piston rubbing on the walls. Now that I have had time to talk with the mechanic I feel that this is the problem.

The Service Engine Soon light is coming on because the computer sees a problem but not a total engine failure.

Since this is due to a flood, I am working with my insurance company. This should be a test to see how good they really are.

Thanks for your response
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#5 (permalink) Old 09-16-2004, 07:37 AM
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So you meant a PISTON rod is bent. I thought you meant the rods that were in the head. Sorry about that. Well I would say your block is damaged from a bent piston rod. I actually had a broken piston rod in one of my pickup trucks and it put a hole right in my block. I had to buy a whole new engine, my insurance would not cover it because it was my fault for driving through the water. Good luck!

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