Surge then Stall

2000 CHEVROLET MALIBU
6 CYL • FWD • AUTOMATIC
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BOWMOR
  • MEMBER
  • 2 POSTS
Engines starts when cold but once it's just under 1/2 way warm...it begins to surge then stall..if you hold your foot on the gas it will warm up then run fine?? Vac pressure is 15inhg. No codes,no pending codes. I have changed everything... It only happens when the temp outside is below 0C and colder.
Nov 11, 2010 at 3:44 PM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
check coolant
check for vacuum leak (what you have for reading is not an indication of no vacuum leak )
check IAC valve
Nov 11, 2010 at 4:27 PM
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BOWMOR
  • MEMBER
  • 2 POSTS
thankyou for the quick reply. For testing the IAC I have removed it and turned key on and seen that it cycles is this suffitient? for vacuum leak tessting I have sprayed ether around the intake runs and other vacuum areas, not lower intake though and had no increase in rpm. I replaced the lowerintake gasket and others above about 2 years ago.
Nov 12, 2010 at 12:00 PM
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