1999 Mazda 626 Idling low & smells bad

Tiny
TRACYBELL
  • MEMBER
  • 1999 MAZDA 626
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 11,000 MILES
My car has started idling really low and sputtering like it's going to stall - and the exhaust smells like sulfur/rotten eggs. Any idea what the problem could be?
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Monday, December 22nd, 2008 AT 9:21 AM

5 Replies

Tiny
DOCFIXIT
  • EXPERT
Could be catalytic converter and /or O2 sensor causing a rich condition. Check engine light on?
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Monday, December 22nd, 2008 AT 2:09 PM
Tiny
TRACYBELL
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Yes, the check engine light has been on for a while - had a problem a few months ago and diagnostic was run on it. They said the only other problem that showed on it was something that would affect the car maintaining speed on the highway (car feels like it's surging every once in a while), but I've had that problem since I bought the car in 03 and it's more annoying than anything. So the check engine light has been on since then and I ignored it because I thought it was that same problem until now.

Thanks for the info! Are either of those two things really expensive?
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Monday, December 22nd, 2008 AT 7:46 PM
Tiny
DOCFIXIT
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It would help me help you if I had the code in P0xxx format. An Auto Zone can do free
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Tuesday, December 23rd, 2008 AT 7:43 AM
Tiny
TRACYBELL
  • MEMBER
I finallly got it to Auto Zone and it came up with P0400 and P0300. They weren't much help there because they said the P0400 could be a lot of things. Also said the P0300 is probably just a spark plug. Do you have any more information about either? Where do I start?
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Thursday, January 22nd, 2009 AT 11:20 PM
Tiny
DOCFIXIT
  • EXPERT
P0300 is random missfire most common cause is Crankshaft Position Sensor.
P0400 EGR Flow Malfunction which can be several things causing code.
Short of replacing parts you will need to take to shop and have car diagonosed and repaired.
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Friday, January 23rd, 2009 AT 10:22 AM

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