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Thread: 91 spirit 2.5l tbi light throttle no power issue

  1. #1
    Mitsu booster
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    Nov 2014
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    canada
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    91 spirit 2.5l tbi light throttle no power issue

    Hi all,my stepdaughters totally stock 91 spirit 2.5 normally aspirated TBI auto trans is down on power and stumbles /shudders on light throttle cruising down the highway and nearly dies under load ,IE climbing a hill,if i floor the throttle it will usually kickdown the trans rev up and go but with lite throttle its dead,no fault codes other than occasional code 21 (oxygen sensor),has 165 000 kms on it(100 thousand miles).new spark plugs,air filter fine,good battery etc

  2. #2
    The moderately moderate moderator Turbo Mopar Staff
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    Dec 2006
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    Akron, Ohio
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    Re: 91 spirit 2.5l tbi light throttle no power issue

    Check fuel pressure. Clogged fuel filter or a weak pump can cause this. Map or TPS could also show same symptoms. I connect a scan tool and see what they are reading and compare to what the correct parameters are.
    Bryan
    86 GLHS #161, 2016 Impala
    SDAC National Member, SDAC Buckeye Chapter Member

    A man has got to know his limitations.....

  3. #3
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: 91 spirit 2.5l tbi light throttle no power issue

    Also check the MAP sensor. If the computer doesn't read the drop in vacuum when the throttle is opened up, it won't the correct amount of fuel to meet the demand.
    Last edited by contraption22; 05-24-2016 at 10:54 AM.
    Mike Marra
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