Intermittent ignition problem

Discussion in 'General Motoring' started by Christopher Wong, Jul 18, 2006.

  1. My 2001 Accent has trouble starting every few days. When this happens -- the
    engine cranks but does not start -- it takes several tries to get it going.
    But once started, it gives me no trouble at all for a while. Between
    episodes, it starts fine on the first try. What's problematic is that this
    starting problem is intermittent, so I'm worried that if I just bring this
    to a mechanic he'd have to make a guess and replace a few things.

    It's not the battery or alternator (I had them tested at Autozone). It's
    probably not the air filter, spark plugs, fuel filter or air filter: they
    are all fairly new. Sometimes, I've seen erratic idling on cold start (RPMs
    go up and down). Sometimes, the engine seems a little noisy on cold start,
    but quiets down after about half a min. Any suggestions on how to approach
    this? Thanks.

    Chris
     
    Christopher Wong, Jul 18, 2006
    #1
    1. Advertisements

  2. Christopher Wong

    Bob Guest

    First figure out if it's a fuel or spark issue. Check for spark when it
    doesn't want to start. Also, make sure that you hear the fuel pump for a few
    seconds when you first turn on the key.

    None of the things you mentioned will cause the symptoms you describe other
    than - maybe - a fuel filter full of water or other stuff. But then, it
    would be unlikely that the car would run well between episodes. You could be
    looking at a fuel pump, PCM, CPS, fuel pump relay, etc. First, figure out if
    it's fuel or ignition.
     
    Bob, Jul 18, 2006
    #2
    1. Advertisements

  3. Christopher Wong

    Marc Guest

    I had a similar problem on a Dodge. This went on for several months
    and it could go for several weeks without a problem. It turned out to
    be a cam sensor but it couldn't be tracked down until the check engine
    light went on so that the code could be read.
     
    Marc, Jul 18, 2006
    #3
  4. Christopher Wong

    hyundaitech Guest

    Check for trouble codes in the ECM. It's possible it saw an issue but the
    problem didn't repeat, so the check engine lamp is not yet on.

    Also, when the vehicle cranks, does it crank normally, slowly, or quickly?
     
    hyundaitech, Jul 18, 2006
    #4
  5. Thanks to you and others for replying. I did not realize that codes could be
    set if the check engine light is not lit. Anyway, I had Autozone scan the
    OBD-II, and came up empty. Even when it has trouble starting, the engine
    cranks normally. I don't get it. Apart from these intermittent starting
    problems, the car runs normally.

    Chris
     
    Christopher Wong, Jul 19, 2006
    #5
  6. Christopher Wong

    hyundaitech Guest

    Could be a bad crank sensor or relay.

    When the condition occurs:

    Check for the check engine lamp during the bulb test. This means the
    computer powers and grounds properly when the ignition is on.

    Like the other poster(s) mentioned, you want to check to see if you have
    spark and injector pulse. Checking for spark is simple enough. Pull one
    of the plug wires and stuff an old spark plug in it and lay on something
    metal and then watch while cranking the engine. To check for injector
    pulse, you'll need a noid lamp (a lamp which plugs into the harness where
    the injector would normally plug in). If the noid lamp flashes, then you
    have injector pulse.

    The immediate things that come to mind as possible causes are a bad main
    or ecu relay, or a bad crank sensor.
     
    hyundaitech, Jul 19, 2006
    #6
  7. Christopher Wong

    Partner Guest

    Checking for spark is simple enough. Pull one
    I thought that I had read where this is not a good thing to do on the
    electronic engines. Its supposed to mess something up. I always did it in
    the old days but not lately(20 years)
     
    Partner, Jul 19, 2006
    #7
  8. Christopher Wong

    hyundaitech Guest

    If the injectors are working, it'll put fuel in the exhaust, so you
    shouldn't really do it. But as a quick test, it's pretty harmless.
     
    hyundaitech, Jul 19, 2006
    #8
  9. Thanks. I'll also listen for the fuel pump (I didn't realize you could hear
    it) next time, as another poster said. I'll keep an eye on the check engine
    light for another reason, namely this TSB I found on hmaservice:

    -------------------------------------------

    TSB 01-36-014: 2000-01 Accent Intermittent Crank-No-Start Caused by the ECM

    DESCRIPTION:

    If a 2000 or 2001 Accent experiences all of the following:
    - Very intermittent crank-no-start (in some cases, months between incidences).
    - The Check Engine Light does not light up when the ignition key is turned to
    the on position (normally it does).
    - The Hi-Scan Pro cannot communicate with the Engine Control Module (ECM).
    - Disrupting power to the ECM and reapplying (for example, by disconnecting
    the negative terminal on the battery or disconnecting and reconnecting the
    EC01 connector) fixes the car temporarily (the engine starts).
    - The vehicle was produced between 6/14/00 and 7/11/00.

    REPAIR PROCEDURE:

    Replace the ECM.

    -------------------------------------------

    I'm not saying I'm positive this is my problem, but I'll keep an eye on the
    check engine light. I do have a 2001 Accent, and the no-start problem is
    suspiciously intermittent, but I don't think it was manufactured in that
    date range. Too bad my warranty expired less than 3000 miles ago. I rather
    doubt that an ECM comes cheap.

    Chris
     
    Christopher Wong, Jul 22, 2006
    #9
  10. Christopher Wong

    hyundaitech Guest

    See, I should check the bulletins more often. Every once in a while,
    there's one I don't remember.

    You can check your car's production date by looking at the placard on the
    driver's door opening pillar. If it's not in the production date range
    (which it is likely not since the range only goes to 7/11/00), then you're
    extremely unlikely to have this as a problem. The good news, however, is
    that if this is the problem, your ECM may be still covered under
    warranty-- it's warranted for 8 years/80k miles under mandate from the
    federal government.
     
    hyundaitech, Jul 22, 2006
    #10
  11. Christopher Wong

    Wildbill71

    Joined:
    Jul 28, 2018
    Messages:
    2
    Likes Received:
    0
     
    Wildbill71, Jul 28, 2018
    #11
  12. Christopher Wong

    Wildbill71

    Joined:
    Jul 28, 2018
    Messages:
    2
    Likes Received:
    0
    Bought my 2001 accent new (Mar 2001 manufacture). Always started immediately until four days ago when it cranked well but never started. Towed to mechanic where it always started. Drove home, parked, drove next day where in afternoon it cranked but would not start. Towed to different mechanic. The next day mechanic had no trouble repeatedly starting car. Drove home, parked overnight, this morning cranks but will not start. ?????
     
    Wildbill71, Jul 28, 2018
    #12
  13. Christopher Wong

    avisitor

    Joined:
    Jul 30, 2017
    Messages:
    311
    Likes Received:
    13
    Location:
    Albany, NY
    Right now it is an intermittent crank, no start
    When it doesn't start, I would open the hood and check for spark and fuel
    When the key is first turned to the "on" position,
    should be able to hear the fuel pump prime the fuel rail for about 2 seconds
    If you touch the injectors then you might be able to feel if they fire
    Some mechanics use a large screwdriver to listen to the injectors (like a stethoscope)

    If no spark then chase the ignition system
    If no fuel or injector pulse then chase fuel system
    If no spark and no injector pulse then probably crankshaft sensor

    Good luck
     
    avisitor, Jul 28, 2018
    #13
  14. Christopher Wong

    angelo jensen

    Joined:
    Jun 21, 2016
    Messages:
    8
    Likes Received:
    0
    Location:
    Indianapolis, Indiana
    Hope you guys didn't replace the ecm. It is "connected" to the crank sensor and cam sensor and if they don't "see" anything they won't activate the ecm and in turn the fuel pump. Gotta love Korean engineering. Try pulling the crank sensor and cleaning it off. The little metal button sometimes doesn't sense the crank. Also may be replace with a junkyard part first(cheaper than new).
     
    angelo jensen, Feb 1, 2019
    #14
  15. Christopher Wong

    Connie

    Joined:
    May 8, 2019
    Messages:
    2
    Likes Received:
    0
    I have a 2009 Hyundai Accent that has developed an intermittent starting problem. It cranks but wont start, a friend arrives to put a tester on it, and of course it starts ok when a mechanic is there... I left it at his shop for a few weeks and they were unable to get it to malfunction. Took it home, and after a few days it failed to start again. The no-starts got more infrequent, and then I had a run of about three weeks when the car started great. Yesterday I had another no-start.

    Does the information in this thread for a 2001 also apply to a 2009? I am hoping I can figure out how to track down which system has the problem. Or maybe ask a mechanic to clean the crank sensor? Would the noid lamp suggestion apply to a 2009? Usually the no-start crank sounds normal, though twice it made a very slow crank sound.

    The problem first start after getting caught in a really heavy thunderstorm. Any possible connection? Car only has 62K miles, has a new battery and starter, and has been well maintained. Any suggestions would be appreciated.
     
    Connie, May 8, 2019
    #15
  16. Christopher Wong

    avisitor

    Joined:
    Jul 30, 2017
    Messages:
    311
    Likes Received:
    13
    Location:
    Albany, NY
    So, assuming this is a crank, no start issue ...
    When it doesn't start, check for spark
    Turn key to "ON" position and listen for fuel pump to prime fuel rail (last about two seconds)
    Feel injectors for firing pulse or use noid light to test.
    Also, possible to spray starter fluid into throttle/in-take to see if it starts
    Check for 5 volt reference on TPS (throttle position sensor)

    If it does start then difficult to test for problem.
    Good luck
     
    avisitor, May 8, 2019
    #16
    Connie likes this.
  17. Christopher Wong

    avisitor

    Joined:
    Jul 30, 2017
    Messages:
    311
    Likes Received:
    13
    Location:
    Albany, NY
    Just remembered, ...
    This may have nothing to do with your issue
    But, have heard on another forum ...
    That the cam shaft sensor can go out of spec when exposed to cold (like over night outside).
     
    avisitor, May 13, 2019
    #17
  18. Christopher Wong

    Connie

    Joined:
    May 8, 2019
    Messages:
    2
    Likes Received:
    0
    Thanks so much for your suggestions. I live in Florida, so overnight cold is more unlikely. I did notice that both cam and crank sensors are pretty inexpensive and easy to replace, so may just do that. My mechanic is going to show me how to do some of the tests, since I was told at one shop that sometimes you just have to start replacing things when the problem is really intermittent. That has already been sort of expensive, so I'm going to learn something about how to test for which system has a problem. Again, thanks for your help!

     
    Connie, May 13, 2019
    #18
  19. Christopher Wong

    Ron

    Joined:
    May 16, 2019
    Messages:
    1
    Likes Received:
    0
    My radio/CD on my 2012 Santa Fe keeps going off and on. It may come on when I start the car , play for 2 to 20 minutes than go out (blank screen) than come back on again, it is constantly going off and on. I thought it was a loose wire, but it goes off while the car is not moving. This has been going on now for months. Any suggestions?
     
    Ron, May 16, 2019
    #19
  20. Christopher Wong

    avisitor

    Joined:
    Jul 30, 2017
    Messages:
    311
    Likes Received:
    13
    Location:
    Albany, NY
    Replace the radio?????
     
    avisitor, May 18, 2019
    #20
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.