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  #1  
Old 12-04-2014, 10:31 AM
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Arrow P1093 SEARCH FOR A FIX CONTINUES...

Not sure the proper way to bump this issue back up but here's a follow up to my previous string of posts " catalytic converter diagnosis help ".

I've been chasing down this pre cat fuel trim too rich bank 2 code for a while now to no avail.

So far I've done:
MAF
Secondary MAF
DISA valve removal, clean, inspect checks out ok
ICV clean, checks ok
Vacuum lines, all ok. ( no smoke test but vacuum leak would show a lean condition vs my rich condition as discussed in prior posts)
New plugs
Swapped coils from bank 1 to 2. No change...
New valve covert gasket ( not related but could introduce unmetered air)
Fuel pressure test at the rail ( shows ok, 50 psi, and holds pressure)
New pre cat bank 2 O2 sensor
All O2 sensors voltages show normal at idle and at speed.
Cat temps show normal pre and post cat ( testing with a laser temp gun)
Previous owner says ALL 02's replaced at 100k, ( car has 118k now)
Previous owner says 1 or 2 cats replaced at bmw dealer at 100k
Live data fuel trims both short and long term show normal.
In fact EVERYTHING shows normal on my Lemur code scanner from BAV Auto. It supports most of the pertinent data live. As I watch the live data via Bluetooth on my iPad both cold, warm, idle, hwy speed, etc. with a seasoned mechanic sitting next to me he says all looks like it should.

The interesting part is that I tracked down the previous owner, and he was hugely helpful in explaining that the check engine light that's been on for YEARS! Holy! He said the car drove fine, showed no issues, same as I'm experiencing. He's a car guy and explained that he didn't want to continue to have the dealer throw parts at it at when the car seemed fine, sans the light. Said the dealer and indi's couldn't figure out the exact issue, and they too concurred the cars "fine"..

Only thing I haven't checked is fuel injectors. I am going to swap bank 1 to 2, and install new O rings. Any other injector tips short of throwing new ones in?

I'm thinking this thing might need a reflash of the DME? Given the previous owners comments, my findings, and with all these dealers and indi's scratching there heads as well. Any suggestions? Cost to re flash? I figured that's a dealer job vs all the threads I read on diy software?
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  #2  
Old 12-04-2014, 12:12 PM
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I skimmed your list and didn't see injectors. That was the first thing I thought after I saw what you had done.

I would get one known good injector and swap it in one at a time for existing. Reset codes. Drive, see what happens.

Also keep in mind BMWs are very finicky about oxygen sensors. Are they OEM? Even supposedly good quality non-OEM sensors can throw a code intermittently. Try swapping your o2 sensors from bank to bank and see if the code moves banks.
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Old 12-04-2014, 12:58 PM
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How did you check the ICV?
Did you do an Ohm test on the terminals? What were the ohm readings?
Did you just shake the ICV and because you heard it rattle you determine that it was O.K.?

When I had the PO1093 error code I replaced the IVC, I didn't bother to clean it.

ICV should make a buzzing sound when you turn the keys to the run position, but do not start the engine. Does your ICV buzz?
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Old 12-04-2014, 02:52 PM
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I used a mechanics stethoscope on each injector and they are alol making a tapping sound as they should but I haven't actually taken them out as yet. I read that I can test they with a multi meter as well?

On the ICV I did clean it, see it shake properly, and do hear w a scope that buzzing prior to starting the car.

The previous owner said he checked everything as well, as did the dealer and no dice.

I'm wondering if a DME re flash would do it if everything else is ok? Im tempted given my frustration to bring it to a dealer where I live in Maine and have them have a look at it. Given the area they see a lot of X5's...

I do however feel like injectors would be the last unknown... Any thoughts on further testing them? Trying to figure if I multi meter test them, or my scope sound test is good enough, etc. don't want to check something and cross off the list with being 100%.

Going to try swapping 02 wires rear left to right now... They are Bosch I believe...
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Last edited by Fortress; 12-04-2014 at 02:54 PM. Reason: Added to post
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Old 12-04-2014, 04:19 PM
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I have had random intermittent lean codes from Bosch 02s for years. Could just be me.
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Old 12-04-2014, 04:56 PM
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By using a multimeter across an injector, you are only determining that it is getting the open/close signals via the harness. It will not tell you if there is some mechanical issue with the injector (eg it's "dribbling"), or over/under flowing.

As you've already listened to each of them with a stethoscope, the chances are better than average that they are actually opening and closing. Whether they are flowing and sealing correctly is another matter entirely.
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Old 01-21-2015, 12:30 PM
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Changed my ccv valve last week at the suggestion of my bmw dealer... Still no fix for my p1093 code... I did smell a slight rotten egg smell a couple times on the hwy last week... Wonder if this could be the rear cat that wasn't replaced like the front? I haven't replaced the fuel injectors or tested them other than my stethoscope test... dealer says they would need a few hours or more to figure all of this out... Gas mileage combined is 18... Also, I get a p3013 misfire code with low fuel and or when it's super cold 10 degrees... Not every time but has happens a few times...

Trying to think logically here and let all of these symptoms point me in the right direction...

Any ideas? Have a look at my previous list of things I've fixed... In other news I've got a coolant leak at the coolant temp sensor... Radiator was replaced 25k miles ago... I assume the hoses too?!
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Old 01-21-2015, 02:43 PM
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I would connect a fuel pressure gauge to the fuel rail and see what type of fuel pressure you have at the fuel rail. The pressure regulator could be bad or the vacuum line to the regulator could be bad so there is little vacuum at the regulator which will signal a wot situation which will increase the amount of gas to the injectors.
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  #9  
Old 01-21-2015, 03:14 PM
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Tried that already. Pressure at the rail was fine...

Trying to think of other stuff it could be...
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Old 01-23-2015, 12:13 PM
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Bump
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