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Old 01-04-2019, 02:00 PM
yo.shuey yo.shuey is offline
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E86 - P114D error code, drove through water logged dip in road

So the other day I drove through a water logged dip in the road, I would probably say it was no more then 2 feet in length driving through it, and at the very most 1 ft deep at the very most. I probably drove through it a little too fast, between 20 to 30mph.

After I drove through the water logged drip, the exhaust or engine started to make a loader noise than usual, like I had a high performance exhaust fitted - and I could hear pop and bangs in the exhaust whenever I lifted off my foot off accelerator.

Anyway I cruised along without revving engine too much. After a good 10 miles, the engine light came on.

I received an error code of p114d - but canít seem to find anything definitively on the internet on what the code relates to, but a few places mention the MAF sensor might have got dirty - which kinda makes sense if water got splashed into air filter.

In terms of the car, at the mo car runs fine on a cold start, but once the car has warmed up, the engine or exhaust, not sure which doesnít sound right. Like itís misfiring or maybe a hole in the exhaust or something. However car runs normal when car is first started up.

I took it to a local garage (as Iíve got a two week wait - to see bmw specialist)... they said they canít guarantee a fix, but it could be one the lambda sensors or spark plugs. But donít trust their opinion purely because they said they cant guarantee the fix, if I replaced plugs and lambda sensor.

My sparks plugs are only 16k miles old.

Car seems to be running fine, apart from the noise, and Iíve avoided taking the engine over 2500 revs until I can see a specialist. Also I have a feeling car might running lean, as the fuel is lasting a little longer than normal... but only slightly.

Any ideas on what the problem could be? I just donít to wait two weeks before I have it looked at.

Should I clean the MAF? Should I replace the MAF ?or air filter? Should I replace plugs?
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  #2  
Old 01-04-2019, 02:14 PM
Spaniarduk Spaniarduk is offline
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Any chance the water had damaged the pre-, post- or both catalytic converter O2 sensors?

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Old 01-07-2019, 10:21 AM
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BostonB6 BostonB6 is offline
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Do you have a CAI or stock intake? I'd start with cleaning the MAF. That's the easiest and cheapest first step. Also, check for vacuum leaks under hood, especially in the intake tubing.
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Old 01-07-2019, 10:28 AM
yo.shuey yo.shuey is offline
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Thanks SpaniardUK and Boston,

So managed to find another BMW specialist. They confirmed both the above - possible Vaccum leak, and on the O2 sensors faulty. I've also bought some MAF cleaner, but managed to find a BMW specialist with an earlier appointment.

Hopefully the e86 will be back on form soon!
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Old 01-07-2019, 09:55 PM
Andyz4 Andyz4 is offline
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OP, do you still have the oem engine undertray on your car? They make oil changes a bit more hassle and mechanics often leave them off, but they definitely offer needed splash protection, especially on a low- slung car such as the Z4.
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Old 01-14-2019, 08:45 AM
yo.shuey yo.shuey is offline
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not sure to be honest Andyz4 - I assume it still has it, previous owner was a proper BMW car guy.

An update on the issue, so took it to a specialist - they said it ws an O2 sensor, but hasn't fixed the issue. So it's booked in again next week.

I've noticed that the blowy exhaust noise happens only after I've driven at over 40-50 mph for a good 4 or 5 minutes straight - and then it becomes really loud. However if I'm in stop start traffic, given enough time of slowly city driving the noise completely goes away as though theres no issue whatsoever.
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Old 01-14-2019, 03:13 PM
Andyz4 Andyz4 is offline
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Wow those are some weird symptoms all right. Any chance that the exhaust noise you are hearing could be the intake instead? Some Z4 models have a sound generator which pipes engine "music" into the car.
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Old 01-14-2019, 03:47 PM
yo.shuey yo.shuey is offline
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defo not, I've owned the car for 6 months, and it only happened when I drove the big puddle. It's defo not a healthy sound. The closest thing I can explain it as is whole in the exhaust making it sounds sporty, deep burble and pops and bangs - but its defo not a healthy sound. It is a really odd one. Anyway lets see how good these BMW specialists are - so far its specialist 0 - Car 1.

oh and it's an e86 - before BMW started to play sounds through the speakers
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Old 01-14-2019, 03:49 PM
yo.shuey yo.shuey is offline
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It defo has something to do with the water I drove through - the specialist also suggest a vacuum leak - but I think they forgot to check. Anyway lets wait and see...
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