2002 Mazda Millenia Mazda Millenia s surge and hesitation w

Tiny
VEGADAN
  • MEMBER
  • 2002 MAZDA MILLENIA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 115,000 MILES
A code of PO300 comes up and says random/multiple cylinder misfire detected, when the cars warmed up its fine but when sitting for days it seems worse, I was thinking of fuel pump any thoughts
thanks
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Monday, July 20th, 2009 AT 9:01 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Actually, if it is worse after sitting for several days, I would lean toward an electrical / ignition problem. WHen was the vehicle last tuned up (including ignition wires)?
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Monday, July 20th, 2009 AT 9:02 PM
Tiny
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Service records unknown. I believe the coils are on top of the plugs so there are no iginition wires. Even when the car is warm I can feel a slight surge when it is warm and I am flooring it.
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Tuesday, July 21st, 2009 AT 11:25 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I have seen problems with the rubber boot that goes over the spark plug from the coil pack. They have gotten weak and have actually allowed spark to short out on the valve cover. (Actually arc through the boot)

You may want to check them. When this happens, there is usually a small gray spot on the boot where it arcs through.

As far as the fuel pump, you could check pressure after it sits for a few days. Here is the how to for checking:

http://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

If you need the gauge, many parts stores will lend or rent it.
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Tuesday, July 21st, 2009 AT 1:53 PM
Tiny
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Just drove this car again when it was cold and sitting for the day and it only hesitates under full throttle and will act normal at part throttle; it just happens when you floor it or half-way floor it. What do you think? Thanks, Dan
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Tuesday, July 21st, 2009 AT 4:42 PM
Tiny
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I REPLACED # 3 COIL AND PLUG, NOW I GET A P1173 CODE A/F MIXTURE CONTROLE(HO2S21) WHAT DO I NEED TO REPACE NOW OR WHERE SHOULD I BE LOOKIG
dAN
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Wednesday, August 12th, 2009 AT 12:19 PM

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