1. Welcome to Jeeps.net!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Jeep discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Jeep owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Cps problems

Discussion in 'Wrangler YJ (1986-1995)' started by Cpion95, May 23, 2018.

  1. May 23, 2018 at 5:24 AM
    #1
    Cpion95

    Cpion95 [OP] New Member

    Joined:
    May 23, 2018
    Member:
    #2326
    Messages:
    3
    Gender:
    Male
    First Name:
    Chris
    Vehicle:
    95 yj
    I bought a 95 yj about a year ago, in april the automatic trans went and i had it rebuilt. Since getting it back I have had 2 crank sensors go bad on it. I change the cups and the jeep runs great for about 20 miles then dies and won't restart. I have fuel pressure and good spark the coil cap, wires and plugs are all new and connected right. Could the trans have been messed up causing the problem or am I just unlucky and getting bad position sensors? Any help or ideas would be appritiated.
     
  2. May 23, 2018 at 6:11 AM
    #2
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
    #317
    Messages:
    2,016
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    My thoughts are you have another sensor bad. MAP, O2, temp, and speed sensors. The crank sensor is probably good. Some others on here might be able to tell you how to test them rather than buying and replacing each one.
     
    aggrex likes this.
  3. May 23, 2018 at 6:42 AM
    #3
    Awrench

    Awrench Well-Known Member

    Joined:
    May 12, 2018
    Member:
    #2303
    Messages:
    362
    Gender:
    Male
    Vehicle:
    3 jeeps
    try checking for codes- its OBD1 so not a a great diagnostic ability - BUT it easy and FREE.

    When it will not start- does it have SPARK when cranking?

    The CKP/CPS is there any physical damage to sensor?
    It is strongly suggested sensors come from jeep only, Aftermarket is problematic esp this sensor.

    " I have fuel pressure and good spark the coil"
    what is fuel pressure psi? did you check spark aat several plugs?
    might want to 'read' a few plugs, wet,dry, black, tan- let us know...
     
    aggrex likes this.
  4. May 23, 2018 at 7:03 AM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

    Joined:
    Jul 19, 2016
    Member:
    #2
    Messages:
    3,673
    Gender:
    Male
    Welcome aboard!
     
  5. May 23, 2018 at 7:26 AM
    #5
    aggrex

    aggrex Well-Known Member

    Joined:
    Sep 12, 2016
    Member:
    #203
    Messages:
    2,358
    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome
     
  6. May 23, 2018 at 8:59 AM
    #6
    Cpion95

    Cpion95 [OP] New Member

    Joined:
    May 23, 2018
    Member:
    #2326
    Messages:
    3
    Gender:
    Male
    First Name:
    Chris
    Vehicle:
    95 yj
    All the plugs have a strong spark, the second sensor I pulled out today was cracked so I'm thinking flex plate, the codes I get are 11, 12 and 21
     
  7. May 23, 2018 at 9:39 AM
    #7
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
    #317
    Messages:
    2,016
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    aggrex likes this.
  8. May 23, 2018 at 7:08 PM
    #8
    JKBob 25

    JKBob 25 Well-Known Member

    Joined:
    Mar 22, 2017
    Member:
    #1197
    Messages:
    3,148
    Gender:
    Male
    First Name:
    Bob
    Jersey Shore, NJ
    Vehicle:
    2016 JK Wrangler Sport
    2" Superlift kit. 315/ 70/17.
    I haven't the slightest idea on codes. But it looks like your in good hands. Awesome codes readers here. Good luck, and of coarse.......Welcome to the forum.
     
  9. May 24, 2018 at 9:12 AM
    #9
    Awrench

    Awrench Well-Known Member

    Joined:
    May 12, 2018
    Member:
    #2303
    Messages:
    362
    Gender:
    Male
    Vehicle:
    3 jeeps
    The cracked CPS - is this a jeep sensor or aftermarket?

    Aftermarket is so problematic.... advise...
     
  10. May 24, 2018 at 9:30 AM
    #10
    Cpion95

    Cpion95 [OP] New Member

    Joined:
    May 23, 2018
    Member:
    #2326
    Messages:
    3
    Gender:
    Male
    First Name:
    Chris
    Vehicle:
    95 yj
    The first was a mopar, the second was aftermarket, I put another aftermarket one in and drove it too the shop that did the trans and they are going to pull the trans and figure out what is going on, I'm guessing either the flex plate broke or the cam is moving I'm hoping for the flex plate
     
    chris4x4 likes this.
  11. May 24, 2018 at 11:15 AM
    #11
    Awrench

    Awrench Well-Known Member

    Joined:
    May 12, 2018
    Member:
    #2303
    Messages:
    362
    Gender:
    Male
    Vehicle:
    3 jeeps
    this is a CRANK sensor not a cam. The crank having movement is more likely with a manual transmission.
     
To Top