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Thread: i call on all the 8 series gurus

  1. #1
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    i call on all the 8 series gurus

    This one has a bunch of us stumped.
    i had a to take apart most of the top part of the engine last year to fix a coolant leak. I also decided to replace all the hoses in the front and back of the engine. also did the valley pan gaskets too. Since i had the fan and belts off i decided to replace the crankshaft sensors, both of them. Now we've put the car all back together and went to start the car . Its wont start. The starter cranks and it sputter occasionally but wont turn over. The car started before i started all the work. The car did sit for almost 8 months and the batteries had drained once over that time. Here are the things we've tried so far with Advice from the great Wuffer. Check fuel pumps... replaced the links in the trunk... check fuses... check that fuel is going to the rails... checked for spark... I've retraced my steps as well as the other 8 guru
    cdnalpina and we are stumped. We are wondering if it might be one of the new crankshaft sensors since that is the one new part but i want to see if it it could be
    something else before i change those again. Any suggestions?
    Last edited by liquidblueloft; 04-22-2017 at 07:53 PM.

    my Twins 850's and its AMG cousin

  2. #2
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    Need 3 things for it to start spark fuel and compression. I would say you have compression and spark but you do not know if you have fuel past injectors. If you pulled plug grounded it and saw a nice blue spark while cranking.

    I would use a VOM on the CPS's and double check they are plugged into the correct position. I would also look for and loose metal items that might have stuck to the crank cps's
    BMW CCA #500359 E31 Chapter.

  3. #3
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    Most likely you have the CPS and the cylinder ID sensor wires mixed up (the 4 plugs underneath the oil filler on the front of the motor).
    '93 850Ci - Mineralweiß Metallic

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  4. #4
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    Quote Originally Posted by TxGR8White View Post
    Most likely you have the CPS and the cylinder ID sensor wires mixed up (the 4 plugs underneath the oil filler on the front of the motor).
    Agree - double check them in the repair manual. They're not labeled on the engine, you need to know using the manual.
    Taylor in Carlsbad

    P=(p x v3 x Cd x A)/2

  5. #5
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    Also, try pulling the fuse from the DWA module in the passenger side door sill. Dead batteries could have caused the module to lose its mind. That being said, TxGR8White's idea is also very possible!
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  6. #6
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    Quote Originally Posted by TxGR8White View Post
    Most likely you have the CPS and the cylinder ID sensor wires mixed up (the 4 plugs underneath the oil filler on the front of the motor).
    Any pictures of the correct positions? I am in the same boat.
    new cps / pumps / filters ht leads / coils
    starts on 6

  7. #7
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    http://www.taylorpatterson.com/wp-co...al-Systems.pdf

    Page 11 details the correct connections. (Section 12-14/1)

    If those are correct and it still don't start, Wuffer's comment about the DWA fuse is your next step forward.
    Last edited by taylorpatterson; 04-05-2016 at 01:41 PM.
    Taylor in Carlsbad

    P=(p x v3 x Cd x A)/2

  8. #8
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    Here is a picture of the wiring routing.

    Engine Front.jpg
    CSi #18 - Car & Driver Magazine 1994 actual test car
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  9. #9
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    In regard to the 4 connectors, it is very well possible that the plugs are not in the correct position to begin with. I had this on my car way back when. You would be best served to verify where the wire go on the harness end. IIRC, the center two at the harness are for CPS - the wire closest to the driver side goes to the bank 1 CPS, the other one is for bank 2. I will see if I can get a pic later this evening.
    '93 850Ci - Mineralweiß Metallic

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  10. #10
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    We have the greatest minds in 8erdom chiming in.

  11. #11
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    I did check the wires with the manualtwice to see if they were mixed up. They were correct.

    my Twins 850's and its AMG cousin

  12. #12
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    Quote Originally Posted by 2001740il View Post
    Need 3 things for it to start spark fuel and compression. I would say you have compression and spark but you do not know if you have fuel past injectors. If you pulled plug grounded it and saw a nice blue spark while cranking.

    I would use a VOM on the CPS's and double check they are plugged into the correct position. I would also look for and loose metal items that might have stuck to the crank cps's
    We did this as well.

    my Twins 850's and its AMG cousin

  13. #13
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    Quote Originally Posted by liquidblueloft View Post
    I did check the wires with the manualtwice to see if they were mixed up. They were correct.
    Pull that DWA fuse and retry
    Taylor in Carlsbad

    P=(p x v3 x Cd x A)/2

  14. #14
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    Quote Originally Posted by Wuffer View Post
    Also, try pulling the fuse from the DWA module in the passenger side door sill. Dead batteries could have caused the module to lose its mind. That being said, TxGR8White's idea is also very possible!
    Will try that next. You must have told that to Rob today.

    my Twins 850's and its AMG cousin

  15. #15
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    Is the DWA fuse near the DWA or under the hood or in the boot?
    also are the cps cables the same length ? Ie 2 dirrerent part numbers.
    my new CPS are identical

  16. #16
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    Quote Originally Posted by koenig d View Post
    Is the DWA fuse near the DWA or under the hood or in the boot?
    Passenger foot panel under the carpet layer. There is the DWA module with its own fuse.
    Taylor in Carlsbad

    P=(p x v3 x Cd x A)/2

  17. #17
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    Thanks Taylor.
    ks8 is rhd.
    drivers side

  18. #18
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    Will try that next. You must have told that to Rob today.
    Yup, had a text and voice long distance diagnostics! 8-)
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  19. #19
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    Just saw your thread and was wondering if the crank sensor and cam sensor is from the dealer?

  20. #20
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    Quote Originally Posted by Pailicool View Post
    Just saw your thread and was wondering if the crank sensor and cam sensor is from the dealer?
    I bought them awhile ago but i'm pretty sure they were from Gault so they would be oem

    my Twins 850's and its AMG cousin

  21. #21
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    Quote Originally Posted by Pailicool View Post
    Just saw your thread and was wondering if the crank sensor and cam sensor is from the dealer?
    CPC Oem stealers
    MAGNECOR leads
    MSD coils

  22. #22
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    I didn't understand if you had a spark or not.. If you don't, check your clearance between harmonic balanced and crank sensors..

    - - - Updated - - -

    Do you have access to a code reader? It might give you and us some more clues lol

  23. #23
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    Quote Originally Posted by bmw528e11 View Post
    I didn't understand if you had a spark or not.. If you don't, check your clearance between harmonic balanced and crank sensors..

    - - - Updated - - -

    Do you have access to a code reader? It might give you and us some more clues lol
    I do have spark. I've had it hooked up to the laptop as well with nothing out of the ordinary. It was throwing an o2 sensor code but i had that before this issue. i cleared it an it hasnt come back. This is why we are stumped but I'll see what happens after i check what Tom mentioned.

    my Twins 850's and its AMG cousin

  24. #24
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    Do you know what is the fuel pressure you have at the rails?

  25. #25
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    My OEM CPS leads will not reach to the blue box
    Quote Originally Posted by rogbmw View Post
    Here is a picture of the wiring routing.

    Engine Front.jpg
    - - - Updated - - -
    Last edited by koenig d; 04-07-2016 at 12:49 PM.

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