Question about 1995 Mazda 626

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1195 MAZDA 626 V6 Engine Smoking

My 1995 Mazda 626 V6 is smoking under the hood around the engine. Not billowing smoke, but definitely smoke when engine is running and accelerated. No oil or fluid spills. Fluids are all full. Car temp gauge is not overheating. Battery was completely drained after parking it overnight following detection of smoke. Can you tell me what I should be looking for?

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Hello! + 12 volts of battery is making resistive contact with ground...During day light...Look for burnt components in engine compartment...Use your sense of smell to help localize...If you do not see/smell anything...Charge or replace the battery...Inspect the + battery connection to the starter motor to insure it isn't close to chassis ground...Start the car after dark and look for sparking or arcing...If it begins to smoke...Zero in with a bright light to locate the burning component...Don't spend a lot of time doing this...Leave the + battery connection finger tight in order to remove quickly...Following this procedure should point you to the area causing the problem...

Send a comment with results....Guru...........Saailer

I’m happy to help further over the phone at

Posted on Jul 20, 2010

  • 2 more comments 
  • jmcsfca Jul 20, 2010

    Hi Saailer - Thanks for the feedback. Just shared with my mechanic - he seems to think the smoke and battery are unrelated. Hmmm. The battery is 3 years old and he says it may need to be replaced. He thinks that smoke may be related to engine gaskets or leaking fluids that have not yet been found. More after he takes a closer look. Thanks again !

  • David Burbee
    David Burbee Jul 20, 2010

    Hello! Smoke from under the hood...No loss of fluids...And the battery drains? Sounds like and should smell like an electrical problem...Let me know what they find...Saailer

  • jmcsfca Jul 21, 2010

    Hi Saailer - Turns out there is a coolant leak and the air separator needs to be replaced parts and labor $100.

    I may also have an oil leak and front and rear valve covers may need to be replaced.

    Mechanic suggests that we recharge the battery, replace the air separator and see if that resolves the problem. If not, he suggests steam cleaning the engine to determine the location of any other leaks .. front and back crank seals, othe?r. Also need to check when my timing belt was last replaced.

    Thankfully, he does not think there is an internal leak, because there is no white exhaust and the car was not malfunctioning otherwise while driving.

  • David Burbee
    David Burbee Jul 21, 2010

    Hello! I hope this resolves the problem...The battery dying after first detecting smoke paints a different picture...If you experience trouble after vehicle is worked on you can still contact me...rate my comments now, and ask another question later...I am here!..................saailer



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