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Thread: TPS vs MPH 7427

  1. #1
    Fuel Injected!
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    Jan 2017
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    TPS vs MPH 7427

    95 gmc, 7427 OD tbi vortec 350. I noticed a difference between the TPS and the MPH while trying to tune a hesitation when accelerating from a stop. As soon as I touch the throttle its moving but its not showing speed on the dash for seconds after its throttled. Is it normal for this to happen?
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  2. #2
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
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    5,768
    The hesitation might not be the TPS vs. MPH. The Vortec heads flow much better than the TBI Swirl Port heads. Often the hesitation is a result of an off idle lean air fuel mixture.

    Possibly adjusting, by adding more fuel to the Acceleration Enrichment parameters will cure the hesitation.

    dave w

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