1998 Mazda 626 Engine Bogging Down

1998 MAZDA 626
70,000 MILES • 6 CYL • FWD • MANUAL
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NYYANKFAN
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  • 2 POSTS
I noticed recently that when starting out in each gear and accelerating the engine bogs and stutters untill it reaches a higher RPM. I have replaced the fuel filter and it started to run better but is back even worse. I just started pulling spark plug wires and noticed the number one wire covered in oil and oil halfway up the plug.
Aug 25, 2009 at 11:47 AM
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PEAR69
  • ✓Experienced Mechanic
  • 1,482 POSTS
The oil on the spark plug wire may cause a errant spark to occur. The oil is probably coming from a leaking valve cover gasket. Did you pull the plugs out and look at them? If so, did you check the plug gap? How about the air filter? A dirty air filter can cause your condition also.
Aug 25, 2009 at 6:20 PM
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NYYANKFAN
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  • 2 POSTS
[quote:b96d6a407b="pear69"]The oil on the spark plug wire may cause a errant spark to occur. The oil is probably coming from a leaking valve cover gasket. Did you pull the plugs out and look at them? If so, did you check the plug gap? How about the air filter? A dirty air filter can cause your condition also.[/quote:b96d6a407b]



After cleaning the plug wire and plug off and then re-inserting them the engine seemed to run much better.
Aug 25, 2009 at 11:54 PM
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PEAR69
  • ✓Experienced Mechanic
  • 1,482 POSTS
The oil will probably leak on the wire again. Keep an eye on it, and/or try to find and repair the leak.
Aug 26, 2009 at 2:35 AM
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