Last post on Jun 13, 2013 at 10:15 AM
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Mazda MPV, Auto Repair, Van
#17 of 76 Occasional misfiring? on startup and manifold leak, 2003 MPV
Jun 18, 2008 (3:39 am)
A few weeks ago the van starting making a rattling/knocking noise once in a while on start up and go away after 10-30 seconds. The noise is like a diesel engine. Also, occasionally (in conjunction with the diesel sound), the fine ticking of lifters is heard. The Mazda service tech determined the noise was due to a leak around the front manifold, and we will be getting this repaired. It was also discovered that a bolt on the rear manifold happened to be broke too. To me, however, I think that the engine is misfiring occasionally on start up, and I could here this phenomenon because of the leak in the exhaust system. Or, can a leak in the manifold seal cause misfiring on startup? I'm also wondering if maybe a leak in the head gasket can be letting just enough coolant to leak somewhere causing a misfire, thereby being a problem completely separate from the manifold leak. Why wouldn't an engine light indicate a misfire....does it only do so once the engine is at running temp?
#18 of 76 Re: 2005 MPV barely starts and barely runs [tilde05]
Jul 09, 2008 (1:52 pm)
My husband works on Mazdas and thinks you should check the throttle position sensor.
#19 of 76 Re: 2005 MPV barely starts and barely runs [alvieandtara]
Jul 09, 2008 (4:59 pm)
Thanks for the info. Actually it was the temperature sensor.
#20 of 76 Idle shudder
Aug 15, 2008 (5:30 pm)
My 2002 MPV has developed a shudder at idle. It seems to run fine under throttle. I can see the engine shaking when stopped (and hood up of course). I had the rear coils replaced maybe a year ago, but then there was noticeable stumbling under power. Any ideas what that might be? I have to take the van in for an oil change next week anyway, but it would be good to have an idea of the problem source and know that it's safe to drive for a few days. No check engine light.
#21 of 76 Re: Idle shudder [backy]
Aug 15, 2008 (5:53 pm)
sounds like a PCV hose, it has been becoming common again to have these replaced
#22 of 76 Re: Idle shudder [subearu]
Aug 15, 2008 (6:42 pm)
Thanks! Sounds a lot cheaper than coils.
#23 of 76 Re: Idle shudder [backy]
Aug 16, 2008 (4:36 am)
Definitely seems to be a PCV hose. At idle (high vacuum) the symptoms appear, while under throttle (low vacuum) they disappear.
There was a recall for some 2002-2003 MPV's for the PCV hose. If the original owner of your MPV did not have this done you could get it done for free under recall. The recall hose was upgraded not to break down as quickly as the old one. So make sure you get the hose with the AJ511389YB part number...not AJ11389YA.
Actually if done by the dealer could be just as expensive as a coil. You can still go to Autozone and have them check kyour codes. Sometimes the computer will store a faulty code but the CEL will not come on. If you are sure it is the hose you can tell the dealership to go ahead and replace it and save yourself $95 diagnostics. If a hose is ruptured bad enough you will hear a hissing noise from the very back of the engine. A few parts you have to take off to be able to take a good look at it.
The hose is a bit tricky to get to, but you could do it yourself. The hose cost about$70 and labor around another $70... if you have to throw in diagnostics that's a pretty big chunk of coin. Good luck.
#24 of 76 Re: Idle shudder [jipster]
Aug 16, 2008 (4:49 am)
But even that replaced hose has had some issues. The hose has gone through a couple revisions it seems. So, you could have had the hose replaced under the recall and now need it again.
#25 of 76 Re: Idle shudder [subearu]
Aug 16, 2008 (7:27 am)
The PCV hose part # I listed, that ended in "YB" is the latest in PCV hose improvements. That's the one backy wants.
If the hose has already been replaced under recall, with the old "YA" hose, then I would ask the dealership for some "goodwill", as Mazda is obviously using (used) substandard/poorly designed PCV hoses.
#26 of 76 Re: Idle shudder [jipster]
Aug 16, 2008 (9:26 am)
Thanks, everyone--very, very helpful! I'll probably take it to the dealer, since I need that (free) oil change anyway, and plead for the "goodwill" if it turns out the part has already been replaced. According to the service invoices I get from them, they are supposed to have checked for recalls at each service (and didn't find any open ones), so it's unlikely this hose hasn't been replaced before. Also the prior owner had the van serviced at the same dealership.