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Thread: Rough idle when hot

  1. #1
    Join Date
    Oct 2016
    Location
    US
    Posts
    2

    Default Rough idle when hot

    Hello,

    So I have a late year 96 xj, all the parts that are on it are 97....I have been dealing with an issue for quite some time. It's been a lot of diagnosing but still no answer. When it's hot outside and the engine is running bout 220, it runs fine until I turn the engine off. With a 10 to 12 minutes time frame of waiting, when I restart the xj it sputters and rough idle, worse in gear but sometimes I can apply the throttle and it will clear up, sometimes it just dies.

    These are the things I've already done:
    Cat converter replaced, IAC, TPS, coolant temp sensor, map Sensor, upstream o2 sensor, purge valve, TSB- heat shield and boot on #3 injector, cleaned the throttle body, new plugs, wires, distributor cap and rotor. Heat tape on fuel rail and other injectors and fuel filter, and raised the back of hood for ventilation.

    I appreciate any feed back, sorry for long post. Really want to get to the bottom of this.

    Thanks in advance

    Sent from my SAMSUNG-SM-G891A using Tapatalk

  2. #2
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Rough idle when hot

    You may be having trouble with vaporizing the gas in the fuel line. If that happens, since you have no fuel return line, you can only give it the gas and get rid of the vapor. Once it cools down, then the vapor condenses and all is nice. One thing you can do is vent the hood and shield the fuel line and injectors
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    Join Date
    Oct 2016
    Location
    US
    Posts
    2

    Default Re: Rough idle when hot

    I have done that. But it still causing issues. Thanks

    Sent from my SAMSUNG-SM-G891A using Tapatalk

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