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2002 yukon denali reduced engine power

I have a 2002 Yukon Denali and it has about 170,000 mi on it. But for over a year now, during cold weather it sputters when starting. It usually sputters for about 30 sec to 1 min then catches itself and will idle pretty high until it is warmed up a little. This morning, it was in the single digits last night, I went to start it and it did its normal sputter thing then was idling ok, then sputtering again then died. I went to restart and Reduced Engine Power when on and it would start and idle at about 1600rmp...no visible exhaust coming out of the tailpipe and no response when I pushed the gas pedal. I left it alone for about 30 mins and it started right up, no light except check engine light, it seems to be acting ok. Any thoughts as to what may be the problem? Like I said my car has never liked the cold...always sputtered upon start, in the cold only. Just last weekend we had to replace the fuel pump. Thought maybe this was part of the issue but apparently not.

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  • 130 Answers

Could be partially plugged catlyletic converter it will only get worse .could be the egr valve and or the map sensor three things a shop would have to check for you .

Posted on Nov 22, 2013

  • 2 more comments 
  • Angela Lucero
    Angela Lucero Nov 22, 2013

    Thanks. I do want to add that it does make a popping noise or thud, heard under the hood, occasionally, when it is cold and sputtering. And when I first start it, it makes a funky cranking noise right as it starts up...I can only relate to the noise of starter going out. Does this give you any more information? Can these be checked by us or does it need to go to shop.

  • gene sewell
    gene sewell Nov 22, 2013

    angela yes a shop can check the egr valve which think is making the noise due to the fact i think your cat is partialy plugged its something a shop will have to check for you . id sure like to know what they think . ts very hard diagnosing acurately with out seeing the viehical.

  • Angela Lucero
    Angela Lucero Nov 22, 2013

    Ok because it was free, I had the check engine codes read at the local auto parts store. Results were: P1514 has been coming up for over a year now. P0171 & P0174 came up two times. P0300. Would a tune up help at all? Do you think that could be a cause?

  • gene sewell
    gene sewell Nov 22, 2013

    this s what you have p1514 is air flow to throttle body sensor corrilation high. po174 an po171 is bank 2 and bank 1 fuel trim too lean .change the throttle possition sensor 2 bolts and a plug in erase codes and that should fix you up

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Posted on Jan 02, 2017

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PyroPCMan
  • 405 Answers

SOURCE: 2002 Yukon XL Denali Problem: When

Most sensors will trigger the check engine light, however the TPS(throttle position sensor) or EGR Valve(exhuast gas recirculation valve) could be potential causes. Does this problem only occur at idle? Is the idle normal in park? Let me know and I can try to assit further.

Hope this helps

Posted on Jun 27, 2008

  • 1118 Answers

SOURCE: engine sputtered, then died. Towed home. I

Might be fuel pump, or filter is pluged up, best to chg. filter and then do a fuel pressure test.

Posted on May 03, 2009

emissionwiz
  • 76630 Answers

SOURCE: 92 yukon sputters at takeoff

is this a missfire? have you replaced the MAF sensor which is a common cause of this, if over 100,000 miles replace plugs and plug wires as well.

Posted on Jun 25, 2009

  • 14 Answers

SOURCE: Fuel pressure intermittently drops causing sputter and die.

check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump

Posted on Oct 10, 2009

psycodelek
  • 202 Answers

SOURCE: I'm a 43 yr old woman...my 2004 PT Cruiser started sputtering when I went to use my a/c and acts like it wants to stall. An hr ago I had my chk engine lite came on and the car was sputtering bad b

It could be moisture yes, could be electrical if the wires and plugs are older they will crack and in humid or rainy weather they would be worse-or when they are cold.

Posted on Jul 11, 2012

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