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06-27-2019, 05:46 AM | #1 |
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DCT Lag/Engine Overheating
For two months the dealer could not figure out what was going on with my 135iS. Between 1st to 2nd and 2nd to 3rd, after shifting there would be a delay and the engine would be in a limp mode for about 2 seconds then go to the next gear. The dealer claimed it needed a computer update (which they could not do). I was in traffic and the message came up saying engine over heating. I take to the dealer and they replace the cooling fan, stating it was not working. While doing this the tech tore a coolant hose(whom after wrapped another hose around it and clamped it because he could not figure out what the part was). Two days later the same issues happen again. I take it to a Euro only specialty shop and in 30 mins diagnosed and ordered the parts. The cooling fan relay was not working, which caused the computer to tell the engine to protect itself, inducing the bad shifts. No computer update was needed. For the coolant hose, it was not listed in the diagrams or catalogs. BMW USA could not identify either. After about an hour the owner, figured it out. It was the coolant hose for the auxiliary PPK cooling system that came on the 135iS model. Long story short, if you're having the bad shifts, check the cooling system.
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06-27-2019, 11:39 AM | #2 |
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Surprised to hear they would let a dealer tech do such a BS fix to wrap another house around a punctured coolant hose and clamp it down. That's a straight up side of the road fix right there.
Any additional info on that fan relay? Part number, location, etc? |
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MightyMouseTech4337.50 |
06-27-2019, 06:08 PM | #3 |
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Not sure why the shops were having difficulty in figuring out part numbers. Here's a thread I created when I bought the PPK2 to install into my car:
https://www.1addicts.com/forums/show...highlight=ppk2 The thread has pictures of the parts and a scanned PDF doc of the parts list with part numbers. The upgraded fan relay is mounted on a metal bracket that is mounted in the area just behind the driver's side headlight. |
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06-27-2019, 06:25 PM | #4 | |
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So I went to your original thread, and in the parts pdf you posted, I noticed that the spark plugs listed (0037244) are for an N54 originally. Do you know if that was an error (maybe they sent you the kit for an N54) or if the N54 plugs actually do work (and maybe better on mildly tuned cars) on an N55? |
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06-28-2019, 10:29 AM | #5 | |
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06-28-2019, 10:51 AM | #6 | |
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06-28-2019, 02:47 PM | #8 | |
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Quote:
PS - I saw above where you said you are now using N55 plugs.
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06-28-2019, 09:22 PM | #9 | ||
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dtla1827.50 |
07-01-2019, 10:25 AM | #10 |
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Thanks for the first hand account and clarification sir.
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MightyMouseTech4337.50 |
07-01-2019, 01:47 PM | #11 |
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Not to dispute MightyMouseTech's advice, but when I had the N54 plugs in my car, I didn't have any issues. Granted it might have been masked by the DCT driveability issues I had during the time I had the N54 plugs installed.
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135is, dct 135 2011 n55 |
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