» » »

Mazda Q&A

Ask Your Question

1994 Mazda 929 Question: shaking

 

Question

koockierodriguez, 3.0L V6, Smithfield, NC, June 23, 2010, 17:49
 Rookie

OK. I STARTED HAVING AN ISSUE WITH THE CAR SHAKING WHEN IT WAS SITTING STILL...SOMETIMES WHEN I WOULD START IT OR WHEN SITTING STILL AT A LIGHT OR A STOP! I USE TO HAVE A DODGE INTREPID THAT HAD A 2.7 LITER ENGINE IN IT AND IT WOULD DO THE SAME THING AND B4 I KNEW IT, IT STARTED AND BROKE DOWN AND NEVER STARTED AGAIN! I WAS SCARED ABOUT THIS HAPPENING AGAIN SO I TOOK IT TO A MECHANIC AND HAD ALL THE COMPUTER TEST DONE! EVERYTHING CHECKED OUT GREAT! TODAY I WENT TO GO START IT AND IT WAS SHAKING REAL BAD FOR A FEW SECONDS AND THEN IT STOPPED...I DON'T KNOW IF IT HAS A LOT TO DO WITH THE HEAT OR WHAT BUT IT'S SCARES ME B/C I THINK I'M GONNA BE STRANDED WITH MY KIDS AGAIN IN THIS 100 DEGREE HEAT!!! I'VE READ ALL THE REVIEWS AND I SEE NOTHING ABOUT THIS, SO I'M JUST NOT SURE WHAT TO THINK!!!

1 Answer
Flag This
  • Answer #1

    Visitor, August 16, 2010, 21:27

    mathew, South Australia.
    http://forums.mazdaworld.org/145-technical-guides/73975-d...
    The link above will show you what the prob is, if the cam belt isn't put back in the right pulley order or is worn, it can jump a cog on one of the cams. Causing the car to stall or worse, it puts a bad vibration through the whole trans as well. Found this by accident when had to replace my sisters water pump.I thought it would be prudent to replace the cam belt at the same. After she got home she called to say the car no longer stalled at the lights and the really bad vibration that went though the car had stopped. She was going to have the trans done and tail shaft rebalanced to fix the problem before the pump let go. And that was going to cost big bucks. She was tossing up weather to get rid of the car. so I hope this helps. Just warning you though, this is a tricky job. not to be tried by the layman. Even the service people can stuff up. u need to check that all marks line up by rotating the crankshaft twice, 2 rotations in the right direction. no spark plugs in. I checked the alignment 3 times before I started to put it back together. And the belts a tight fit so it can jump easily. And re-compressing the belt tensioner can be tricky. So to all who try the best of luck. So basically the motor is out of balance. Be it any V type motor as V6 ,V8. ETC. Controlled Fuel detonation is critical to keep an engine from trying to tear itself apart. both banks must work in harmony.
    P.S. I had to recalibrate the vacuum lines on the motor to get it to run OK after the auto choke disengaged. eg. "The motor revs up and down and nearly stalls."

    Reply
    Flag This