M52 misfire

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • isra
    Advanced Member
    • Mar 2011
    • 177
    #1

    M52 misfire

    Ok, so my e30 has been sitting for about 3 weeks, an now that i want to drive it it has a misfire i think.. I noticed this when i was getting on the freeway today
    Its around the 2.5k-3k rpm range. I loose power an get a deep exhaust sound, after 3k rpm car would go back to normal. Then i decided to floor it after the misfire an car would bounce off 5k rpm and will not go over that..

    I check the coils by disconecting one by one an they are good
    I got new plugs since i had 2 years with them..
    An still i get the misfires now im thinking cam sensor, but i would like more ideas from my r3v fam... Thanks!
    Tags: None
    • Mr.SWISS
      E30 Fanatic
      • Nov 2005
      • 1251
      #2
      My car did this when the compression in #2 was low in the S52. lopy idle, throttle cooks up, not steady, hits 5K and falls on its face when it had crazy pull before...
      Originally posted by 325Projectz
      don't listen to the diagram... listen to mr. swiss.
      :nice:

        Comment

        • isra
          Advanced Member
          • Mar 2011
          • 177
          #3
          That sounds bad.... I hope thats not my case

            Comment

            • isra
              Advanced Member
              • Mar 2011
              • 177
              #4
              Anybody....

                Comment

                • !kid
                  E30 Fanatic
                  • Mar 2009
                  • 1362
                  #5
                  bad throttle position sensor maybe?
                  :borg:

                    Comment

                    • Cynical 1
                      Advanced Member
                      • Nov 2012
                      • 129
                      #6
                      do a compression test. google how to do it properly.

                      other option is fuel injectors, or a bad sensor - cam or tps.
                      1988 325 "super ETA" - Hilde - M52B28 swapped...
                      1969 2002 - Griselda - 20VT AWP swap and full resto in progress...

                      sigpic

                      project blog - http://www.cynicalmotorsport.blogspot.com/

                        Comment

                        • isra
                          Advanced Member
                          • Mar 2011
                          • 177
                          #7
                          Okay so this morning i got up at 4am to start work at 5am an i took my e30 i was driving down the freeway an the car was still cold.. An it didnt have any issues, i got on it an took it up to 115mph... Pulled strong all the way no problems at all.. I made a stop on a 76 gas station to get some coffe got back on the car an then same problem started again will not go over 5k an it would misfire at 2500-3000k rpm... So this issue will only happen when the temp is in the 1/2 way mark/operating temp

                            Comment

                            • Plynch2
                              Member
                              • Apr 2012
                              • 56
                              #8
                              It's probably you crank position sensor. my car ran great cold once it got warm it wouldn't r3v past 5000rpm. Replaced it today now it runs perfect.

                                Comment

                                • isra
                                  Advanced Member
                                  • Mar 2011
                                  • 177
                                  #9
                                  Im going to start with a compression test Just to get that out the way. About the sensor whats a good way to test them...? I just dont want to waste money in sensor i dont need.

                                    Comment

                                    • Plynch2
                                      Member
                                      • Apr 2012
                                      • 56
                                      #10
                                      Look up the ohm readings on google test it cold and then warm. Mine was in spec cold but after the car got warm it was out of spec.

                                        Comment

                                        Previous template Next
                                        Working...