Question about 1993 Buick Roadmaster

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Car runs great when cold, terrible when warm or hot?

Only when its warm or hot (car)does it miss,never when cold , i think it may have something to do with what ive learned to call heat soak.?

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First things first. "Heat Soak" generally happens when the vehicle is driven very hard before it is shut down, and even then usually only shows up on the ensuing start. This is not to say it is impossible that is your problem, it is just to say I believe it is something in the ignition system. The ignition system is the most likely to become affected after the vehicle has warmed up.

Are there any codes in the computer and does the engine light flicker or stay on steady when this occurs?

Posted on Mar 23, 2014

Testimonial: "thanks for the heat soak insight i'll keep that in mind. also we put new cap rotor plugs wires and proper motorcraft ign mod. Thanks again for your help!! Allen"

  • 1 more comment 
  • Stumped
    Stumped Mar 23, 2014

    the heading says 93 buick, i'm speaking about a 95 ford taurus 3.0 am i in or on the wrong page? stumped, Allen

  • Vincent Competello
    Vincent Competello Mar 24, 2014

    Did the replacement of the parts quell your issue?

  • Vincent Competello
    Vincent Competello Mar 24, 2014

    I do condone replacing parts blindly but, if it worked out for you then fine. If not, get back to me.

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Posted on Jan 02, 2017

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SOURCE: car runs great when cold after warming up, misses

Sounds like its running rich. Any codes?

Posted on Feb 14, 2010

dj_relly999
  • 4070 Answers

SOURCE: car starts great cold or hot. but runs bad when

Hello and welcome to FixYa!

You may just have system failure. As a first course of action, I strongly suggest that you remove the positive battery connector and let it sit for at least 5mins. before reconnecting it. This will reset the system and can get your vehicle back to it's normal operation.

This thing really happens and reconnecting the positive battery connector serves like a jumpstart to the vehicle's PCM (powertrain control module).

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Sep 18, 2011

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