Question about 2003 Mazda MPV
Out of the blue, my MPV is shaking and making a jumping movement when in idle mode. It's worse in drive and reverse but does it when in neutral too. It's driving, but I can feel the jumping then too. The whole engine is shaking when I pop the hood. The check engine light just came on too, blinking. I had an oil change last week, and no one said they detected any other problems. I'm afraid it's something with the transmission...any advice?
Your problem is a collapsed PCV hose. This is a common problem with MPVs. There was a recall on this issue, but even the replacement part is now failing. I diagnosed mine and replaced it myself several months ago.
It's easy to diagnose. In the very rear of the engine compartment, on the manifold just behind the valve cover, you can feel (and sometimes even see from the driver's side) a rubber hose that enters the manifold at a 90 degree angle. If you can wedge your hand in to get a good feel of it, you will probably find that it has collapsed at the 90 degree elbow.
I have heard stories of dealers charging in the neighborhood of $300-600 for this repair. If you are mechanically inclined, you can change it out for the cost of the part (about $85 available only at the dealer - of course). There is a really good illustration and instructions available at mpvclub.com.
A word of warning - about six weeks after fixing the PCV hose, my coolant temp sensor went out. Research indicated that this is common. It seems that the violent shaking caused by the bad PCV hose causes the brass ring around the sensor to crack, leak and eventually fail.
If you have trouble locating the link for the PCV repair email me at firstname.lastname@example.org.
Posted on Nov 06, 2008
Sounds like one of the less than competent techs who did the oil change knocked something loose on the engine, and it DOES sound like an ENGINE problem, like a dead misfire. Make sure all of the spark plug wires are in place and secure (A loose/disonnected plug wire will make a popping/clicking sound, and show up in darkness as electrical arcing.
It could also be caused by a bad sensor connection, or possibly a vacuum hose being disconnected (which would make a noticeable hissing sound).
If you have no luck in those areas, locate one of the major auto parts suppliers that offer free diagnostic scans and read the trouble codes causing the check engine light, and we'll go from there.
Keep me posted, and good luck!
Posted on Jun 09, 2008
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Posted on Jan 02, 2017
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