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Rough idle and blue smoke

Recently overheated on the way to get the cracked exhaust manifold replaced and has been idling rough since. Found a leak in the intake manifold and had that replaced, along with a new thermostat, temp plug, y pipe and muffler. It has a rough idle, but smooths out upon acceleration and runs fine... Until coming back to idle. A blueish smoke comes out of the tailpipe and it smells rich. Any ideas?

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  • Scott W Nov 03, 2012

    1995 chevy silverado k2500 5.7l

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  • 18 Answers

Possible vacuum leak and or internal engine issue, have a cyl compression check done along with cyl leakage test

Posted on Nov 03, 2012

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Posted on Jan 02, 2017

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SOURCE: runs waaaay to rich, rough idle, sometimes

fuel injected?try replacing the fuel regulator

Posted on Jan 16, 2010

  • 42 Answers

SOURCE: Rough idle until warm 22r

if it is a carburated engine it is probably the a.a.p. diaphragm in the carb. if you remove the air cleaner and look on the side of the carb that is towards the valve cover near the front yow will see a vacuum hose going to a cover that is fastened with 3 screws. if you pull the vacuum line off you will see that there is probably fuel being sucked into the line due to the leaking diaphragm. the vacuum source is temp controlled and cuts off when warm. but when cold sucks fuel directly into the intake. remove the 3 screws to replace the diaphragm, being carefull of the spring. good luck!

Posted on Dec 18, 2008

michigan man
  • 3533 Answers

SOURCE: 99 Expedition, runs rough, won't idle, no power.

it could be two things a bad injector or a the intake gaskets are leaking

Posted on Apr 04, 2009

  • 67 Answers

SOURCE: idling up and down between 1200 and 800 rough idle 2002 saturn sl

oooooooooooo my friend white smoke mens head gasket is gon sorry

Posted on Dec 11, 2009

  • 1374 Answers

SOURCE: Cold start-extremely rough idle-Shakes,smell fuel

Black smoke means buring rich. Have the vehicle's ECU scanned for codes and do the repair the codes describe. I'm gonna take a stab in the dark and say Mass Air Flow Sensor.(MAF)

Posted on May 07, 2010

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