Results 1 to 3 of 3

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

  1. #1
    Mitsu booster
    Join Date
    Nov 2014

    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
    Join Date
    Dec 2006
    Akron, Ohio

    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.
    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
    Join Date
    Dec 2005
    Havertown, PA

    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
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:

Similar Threads

  1. TIII throttle body issue?
    By tsiconquest88 in forum 16v Factory Engines
    Replies: 4
    Last Post: 12-02-2010, 05:34 PM
  2. Throttle issue
    By SebringLX in forum Electrical & Fuel System
    Replies: 4
    Last Post: 06-12-2010, 04:12 PM
  3. Daytime running light issue
    By 135sohc in forum Electrical & Fuel System
    Replies: 5
    Last Post: 01-06-2010, 07:39 PM
  4. Pinging? Under light throttle, but not WOT
    By SL#189 in forum "I need help!"
    Replies: 14
    Last Post: 07-17-2007, 07:45 PM
  5. Stumble at light throttle!
    By 3Bar_Mopar in forum "I need help!"
    Replies: 20
    Last Post: 03-28-2006, 05:32 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts