Question about 1995 Buick Riviera

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When my 1995 Riviera SC shifts to OD at about 45mph or higher if going uphill(below 1800 rpm), the car shutters until i let off the gas & push again to raise it to ~ 2000 rpms..as soon as it downshifts, i have to re- raise the rpms to take the engine shutter away. Goin broke on gas. Whats ur first line of defense? New AF. Always 93oct.

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  • whatleece Oct 09, 2010

    yes, i agree, Low on power in general. At this point, i have to keep her 3/4 to Full at 93 for my engine lite not to come on. But that still doesnt chg the stuttering that i get after she shifts to OD (15-1800 rpms)

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  • Buick Master
  • 11,800 Answers

It shutters because the engine struggles to power the car uphill - it doesn't have enough power at such low revs. That is absolutely normal behaviour if the incline is steeper than normal or the car is loaded.
If they aren't then the engine is low on power in general - you will have to check the injectors, the O2 sensor and the catalyst.Also check the sparkplugs for signs of detonations - replace them to be sure.
Also check the compression in the cylinders and the oil - the engine might be simply worn out.

Posted on Oct 09, 2010

  • Azrael SRL Oct 09, 2010

    The stuttering is caused by the fuel detonation - the air/fuel mixture is too little for what the engine needs so when it's lighted it burns very fast but without generating too much actual force on the piston = the engine stutters without developing to much power.

    As i said this is caused either by a worn out engine or an fault in the fuel delivery. Most likely it's the engine.

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