Hot start issue
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Thread: Hot start issue

  1. #1
    FRESHMAN ROVER
    Join Date
    June 20th, 2018
    Posts
    6

    Hot start issue

    Been trying to solve a hot start issue for years and finally have a starting point. The issue is when the engine is hot and you start it after letting it set for 15 mins or so it has a rough idle for 10-15 secs then clears up or dies. I discovered today that when this happens if you remove the vacuum hose that runs from the IAC to the fuel regulator it clears up. Any thoughts?
    Thanks,
    Rusty

    FYI 1995 RRC 3.9

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  3. #2
    SENIOR ROVER
    Join Date
    June 11th, 2016
    Location
    northern va 22003
    Posts
    1,335

    Re: Hot start issue

    by disconnecting said hose, you are introducing false air to the possible rich mixture. this allows for proper / better combustion mix. if you have diagnosis software you could look at sensor functions on real life, among other important components on any fuel injection system you need to look into coolant temp sensor for loose or failed connector, failed sensor, static fuel pressure and 02 sensor activity when hot.

    basically you may be experiencing a flooding hot engine.
    2k p38 4.6
    95 lwb 4.6
    01 d2 4.0

  4. #3
    SENIOR ROVER
    Join Date
    June 11th, 2016
    Location
    northern va 22003
    Posts
    1,335

    Re: Hot start issue

    may I add, make sure you have a working thermostat. otherwise the readings by the temp sensor are null.
    2k p38 4.6
    95 lwb 4.6
    01 d2 4.0

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  6. #4
    FRESHMAN ROVER
    Join Date
    June 29th, 2011
    Posts
    164

    Re: Hot start issue

    I am dealing with same issue on my '95. It happens only after longer highway drive. I was thinking leaking injector or two making the spark plugs wet, but that should be happening all time. It passing "smog test" fine!

  7. #5
    FRESHMAN ROVER
    Join Date
    June 20th, 2018
    Posts
    6
    Thanks for the info 95classiclwb . I’ve replaced the fuel temp, coolant temp and 02 sensors and fuel pump/filter. I’m going to try this weekend to test the wiring leading from the sensors to the ecu to see if that may be the problem. I’ll post results. Thanks!

  8. #6
    FRESHMAN ROVER
    Join Date
    June 20th, 2018
    Posts
    6
    Well I’ve checked the fuel temp and coolant temp sensors and both are with parameters. It’s definitely a heat issue because in the winter I rarely have this happen. Could the MAF have anything to do with it? Thanks for all the help,
    Rusty

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