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Car stalls when you remove the oil filler cap

Tiny
CRONIES6
  • MEMBER
  • 1995 MAZDA 626
  • 145,000 MILES
Forget to put oil filler cap back on one day. Drove for about 30 miles and started running rough, got to a light and it stalled out. Put cap back on and started fine. While running, took the cap off and it immediately died. Put back on and runs fine. Even pulled out dipstick and noticed a little hesitation in running. As soon as you take cap off, it dies again. Is this a normal thing or bigger problem?
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Monday, February 13th, 2012 AT 2:53 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the positive crankcase ventilation valve and its system
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Monday, February 13th, 2012 AT 2:55 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That would be normal. You are creating a vacuum leak when you do that.
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Monday, February 13th, 2012 AT 4:20 PM

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