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Toyota Matrix Engine Questions

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

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#61 of 69 Re: idle hunting in matrix/vibe/corolla when cold [montreal3] by astroguy1 May 21, 2009 (6:38 pm)
Replying to: montreal3 (Jun 20, 2006 8:15 am) Hello Montreal3. This is a couple of year old post but I'm hoping that you can tell me if you've made any ground with toyota. I have an '07 Corolla with your exact problem....getting the royal run around from Toyota. Can you get in touch with me? Below is part of an email that I've sent Toyota Canada....   I purchased a new '07 Corolla from Kingston Toyota Feburaury '07 . It ran fine until the 45,000km mark in December '08 . At this point my wife informed me that her car was reving oddly when the cold of fall arrived in '08. This was a new issue and didn't exist at all previously. The engine now hunts for idle after cold soaking of 6 hours or more in any temp below +3 deg C with 100% repeatability.    The vehicle starts and runs fine for approx 1.5 km but for the next 4 km or so depending on the temperature it will rev hunt when rolling the car with the engine unloaded to our next local stop sign. The engine revs up to 2,300 rpm and cuts back to 1,200 rpm repeatedly every 1.5 seconds. It will do this as many as 30 X consectively. I have 5 videos (mpegs) of the condition showing the engine tach as the car rolls....... (I've been told by Kingston Toyota that they've sent these mpegs to Toyota Canada two months ago) In even colder temperatures, like -20 deg C range the vehicle will do this idle hunting/surging without needing to have the car rolling with the engine unloaded. At these temperatures it will do it at a standstill , you can get out of the car and walk around the vehicle as it surge revs. The colder it gets the worse it is and the longer it lasts. Basically the problem goes away completely after a good warm up. Whatever warped component seems to comes back into spec with the heat. The dealer has worked reasonably hard on the problem... first replacing the water pump Jan 9. '09, then cleaning the throttle body, then replacing throttle body, then replacing various valves an sensors, finally replacing the ECU itself. The problem still exists, it isn't intermittent at all, it is an everyday occurance through the entire Replies to this message: circuitsmith (May 22, 2009 7:27 am) astroguy1 (May 27, 2009 5:35 pm)
#62 of 69 Re: idle hunting in matrix/vibe/corolla when cold [astroguy1] by circuitsmith May 22, 2009 (7:27 am)
Replying to: astroguy1 (May 21, 2009 6:38 pm) Astroguy,   Have they replaced the thermostat? If it's not closing completely it can slow the warm up process and throw things out of sync. Replies to this message: astroguy1 (May 27, 2009 5:35 pm)
#63 of 69 Re: idle hunting in matrix/vibe/corolla when cold [circuitsmith] by astroguy1 May 27, 2009 (5:35 pm)
Replying to: circuitsmith (May 22, 2009 7:27 am) Yes the thermostat and waterpump have both been replaced thanks.
#64 of 69 Re: The continuing head gasket saga [prisma] by ttropical Jun 19, 2009 (2:02 pm)
Replying to: prisma (Apr 05, 2006 8:10 am) I know this is a latent post, but I just had a Matrix head gasket blow for no reason one month out of warantee, at 68k miles. I have been a tech for 25 years and I maintain my car religiously.   Toyota corporate did nothing about it. This is my first and last Toyota. Never saw this out of a Chevy. Replies to this message: laserblue (Aug 01, 2009 2:50 pm)
#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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