84 Seville - low speed hesitation
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HT4100 4.1, 4.5, 4.9 Discussion, 84 Seville - low speed hesitation in Cadillac Engine Technical Discussion; Just acquired an 84 Seville, 4.1L gas, 51,000 miles, garage kept, oil chgs every 6 months, previous owner always used ...
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    jsseville is offline Cadillac Owners Member
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    84 Seville - low speed hesitation

    Just acquired an 84 Seville, 4.1L gas, 51,000 miles, garage kept, oil chgs every 6 months, previous owner always used unleaded premium. Throttle response is good when engine is cold, however, once warmed up begins to hesitate during first inch or so of gas pedal travel - once past that point, it runs smoothly but initial acceleration or accelerating after turning a corner, engine stumbles until you press harder on the pedal. The warmer the engine is, the more it hesitates. I've used three bottles of F.I. cleaner so far. Is this a vacuum leak or a clogged something? Hopefully it's an easy fix. (BTW, Tuffy in Ft. Myers said, "oh, they all run this way!", I don't believe them for a minute!).

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    cadillac_tech is offline Cadillac Owners Fanatic
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    Re: 84 Seville - low speed hesitation

    Quote Originally Posted by jsseville View Post
    Is this a vacuum leak or a clogged something?
    Plugged MAP port....Remove throttle body to clean it.

  4. #3
    jsseville is offline Cadillac Owners Member
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    Re: 84 Seville - low speed hesitation

    Is this something the lay person can do fairly easily or should I take these instructions to a dealer/mechanic and let them do it?

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    awadecki is offline Cadillac Owners Enthusiast
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    Re: 84 Seville - low speed hesitation

    It's pretty easy, but first here's what I'd do: buy a can of carb. cleaner, remove the MAP hose at the throttle body and spray a ton of it in the port through the can's little red extension. That'll probably get most of it. Otherwise, you'll need to disconnect the fuel lines (no big deal) and remove 3 bolts.

  6. #5
    carnut is online now Cadillac Owners Master
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    Re: 84 Seville - low speed hesitation

    We must first assume he knows what a MAP hose connection is. If he does not then a technician should ck it. I would also verify the TPS is set correctly or is not open electrically at that warm throttle angle. Both these items can be monitored thru on board diagnostics assuming one has the factory service manual.

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