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Thread: P1188 & p1189 s52

  1. #1
    Join Date
    Jan 2017
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    Charlotte
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    1998 M3 Vert fern/Modena

    P1188 & p1189 s52

    Okay here's what I've got:

    1998 M3 - S52 motor. Has a comforti (spelling?) tune, ASC delete, Secondary Air delete (coded into the software too). Recently did the head gasket.

    Upon startup, and seemingly only when it's sub 50F outside, the engine idle is high, around 1,000RPM then drops after a minute or so to it's usual ~500 RPM or so, OR if you tap the gas it drops to normal immediately. Plenty of power, no hunting or high idle after that. If I clear the codes, the light seems to come back after maybe 3 key cycles and maybe 5 min of driving. Other than the dash light, you cannot notice an issue aside from that initial high idle.

    Things I've checked:
    intake and exhaust manifolds for tightness
    inspected intake boot, ccv hose
    new with head gasket items: spark plugs, idle control valve, CCV, CCV hose, engine temp sensor, MAF (I have two and I have swapped them, the codes still come back)
    new air filter
    new fuel filter

    haven't checked fuel trims

    I will try: swapping 02 sensor plugs (saw something on that somewhere, and maybe I've swapped them during the reassembly mistakenly)

    I'm kind of at a loss. Everything seems to point to a vacuum leak, but I cant find one. Could it be bad pre-cat O2 sensors since I had a bad head gasket and was burning coolant? It was cyls 5&6, so you would think it would only be one O2S if that was the case. I guess that is my question since I have some work to do still - could O2 sensors cause this? If so, any tips on testing them? Resistance values or anything?

  2. #2
    Join Date
    Jun 2010
    Location
    NY
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    1997 328i
    Yes it is possible that the pre-cat sensor plugs are reversed. It's also possible that the sensors are bad.

    Your high idle could simply be a worn throttle cable or something with the linkage.

    Did you have the head professionally checked, for cracks and flatness?
    Avoid Vogtland Suspensions! Rusted then failed!

  3. #3
    Join Date
    Apr 2015
    Location
    Tennessee
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    1,146
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    1998 BMW 328i
    I looked those codes up at work and they seem to correspond to both precat O2 sensors.

    Sent from my VS987 using Tapatalk

  4. #4
    Join Date
    Jul 2004
    Location
    Houston, TX
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    9,659
    My Cars
    MCoupe, 328is, Z3, TDI
    You need a smoke test done to identify all vacuum leaks. P1188 and 89 are for lean running identified. It does not mean that the oxygen sensors themselves are bad.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods. RomRaider self-tune work in progress.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg: Many Mods ~300ft/lbs tq, diesel, daily beater. Love/Hate relationship.
    - S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 250hp/400ft-lbs

  5. #5
    Join Date
    Jan 2017
    Location
    Charlotte
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    1998 M3 Vert fern/Modena
    When I did the head I did have it checked and resurfaced yes. Itís definitly not a stretched/worn throttle cable. Didnít do it before, and doesnít act up after it comes back down. Idles smooth too. Iím going to see about a smoke test - itís got to be beyond small at this point, or something I canít get to. Iíve tightened everything and looked at all tubing. I might try reversing the o2 sensors and see what happens first too. Thanks all.

  6. #6
    Join Date
    Jan 2017
    Location
    Charlotte
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    1998 M3 Vert fern/Modena
    Sorry for the long delay in follow up. Hadnít touched it in a while. I got new O2 sensors after seeing the one wasnít alternating voltage like it should. Was super excited to have solved this issue and just like that the light came back on. So I finally ended up smoke testing the car. Took a very large amount of smoke to produce the tiniest leak in the intake manifold gasket by cyl1 (so small that without a light right on it youíd miss it). Replaced the gasket, cleaned and inspected everything, including smoke testing the manifold off the car, and put it all back together with new gaskets. Thought for sure that would be it but it wasnít. The codes came back again! As a refresher, Iíve replaced/checked:
    intake and exhaust manifolds for tightness
    inspected intake boot, ccv hose
    new with head gasket items: spark plugs, idle control valve, CCV, CCV hose, engine temp sensor, MAF,
    new air filter
    new fuel filter

    Iím thinking maybe I should run some injector cleaner. Anything else? I will say I donít know that either maf is bmw oem theyíre both aftermarket I believe (I know one is for sure). I have read that the maf is a picky item if itís aftermarket.

  7. #7
    Join Date
    Jun 2010
    Location
    NY
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    1997 328i
    With the SAP delete was the valve removed and the exhaust manifold sealed ?
    Avoid Vogtland Suspensions! Rusted then failed!

  8. #8
    Join Date
    Jan 2017
    Location
    Charlotte
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    My Cars
    1998 M3 Vert fern/Modena
    It was, with gasketed block-offs. Actually thatís another thing I did - put the SAP back in before I did the o2 sensors.

  9. #9
    Join Date
    Jan 2017
    Location
    Charlotte
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    My Cars
    1998 M3 Vert fern/Modena
    tested fuel pressure and the regulator - both checked out okay. Reverse smoke tested to test the crankcase side via dipstick tube (read somewhere going through the intake neglects to test that side of the engine), not a single leak except pre-maf at the mating point between the air box and the maf (even then super small - and shouldn't be causing these codes as its metered air). Put fuel injector cleaner in, lets see what happens I guess. I'll have a stroke if I did all this stuff when I should have started with fuel injector cleaner. Serves me right for not checking the easiest stuff first I guess.

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