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Toyota Matrix Engine Questions

69 messages,  Last post on Oct 04, 2009 at 10:08 AM

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#65 of 69 Re: Odd knocking noise [etnpnys] by yellowmatrix09 Aug 01, 2009 (12:10 pm)
Replying to: etnpnys (Aug 07, 2007 4:39 pm) I have the same problem with my 09 Matrix XR. The standard fuel requirement in the manual was 87 octane. With the onset of the hot weather, the engine ping or knock has come out. No results have come out too from my dealership's computer diagnostics (whatever that may be...I don't see it). When I shifted to 92 octane premium gas, the ping lessened considerably but you could still hear a little bit of it especially when my aircon is on...This engine ping or knock can be deceiving to a mechanic if he doesn't roll down the windows and pass through a place where there is a wall on either side of the front seats. If you've got your windows rolled up, you will not hear them. I believe Toyota's body insulation helps in covering up this noise. I guess Toyota must have to admit that the XR's should be using premium 92 octane gas instead of the manual's 87 octane because of the high compression ratio...I don't like to live with using 92 octane because it is more expensive. If I knew it, I wouldn't have gotten this car....still up for a resolution on this case... Replies to this message: etnpnys (Aug 03, 2009 5:24 am)
#66 of 69 Re: The continuing head gasket saga [ttropical] by laserblue Aug 01, 2009 (2:50 pm)
Replying to: ttropical (Jun 19, 2009 2:02 pm) Dear ttropical,   I own a Chevrolet and the same thing happened to me. I don't want to brag about it but the "head gasket" on my 2005 Equinox blew at 29,000 K. That's 39 K's less than your Matrix. My warranty was over by 1 month (isn't that a coincidence) I called G.M. and they didn't do a thing about it, they almost told me to shut up and pay for my repairs.   My 1999 Venture... the same thing, 3 months after my warranty was over.... "blown head gasket" at 42,000 k     I'm like you, if I could bring my cars in the house I would. I drive my vehicles with love, I'm not a lead foot driver, follow the speed limits and always doing my maintenance regularly.     Yes the same thing happens in Chevrolets.   (By the way, seriously, I was thinking of trading for a 2010 Matrix next year).
#67 of 69 Re: Odd knocking noise [yellowmatrix09] by etnpnys Aug 03, 2009 (5:24 am)
Replying to: yellowmatrix09 (Aug 01, 2009 12:10 pm) Yes! Exactly! Wow... You can't know how much of a relief it is for me to see that somebody else knows what I'm talking about. Like I said: I had one guy at a Toyota dealership tell me that it was the belt tensioner - that he'd seen them have to replace a few of them around 30k-40k miles.   ...But that doesn't make sense; that thing shouldn't have any moving parts at all. And if you check very closely under the hood you can almost pinpoint it to the furthest left cylinder (the one on the passenger side - I forgot the cyl #) right under the head.   For what it's worth, the car is still running great at 155k. I put 89 octane into it regularly and, like you said, the ping is lessened.   ...Now I have an airbag light coming on that's driving me crazy - but I really think that everybody on this board is just going to say "you need to get it serviced and have the airbags looked at." Well duh. But they're just mechanics - and so is half of my family. What are THEIR mechanics going to find wrong? I did a diagnostic myself by shorting two pins on the OBDII connector and getting the error code. I looked up that error code and it said something about my passenger side airbag isn't initializing properly - but it doesn't come on consistently! Perhaps a fuse that needs to be replaced? I dunno.
#68 of 69 Rough Idle by toyota313 Oct 04, 2009 (10:08 am)
#69 of 69 Rough Idle by toyota313 Oct 04, 2009 (10:08 am)
2003 Toyota Matrix idles rough after engine warms up. Diagnostics code shows it misfiring on all 4 cylinders. It started after I washed engine compartment. Could this be a coil problem or arcing of the spark plug boot? I have taken it to the dealer and they stated it was a fuel problem and run a few tanks of good fuel through it. This did not help. Any suggestions? Thank you

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