Question about 2007 Mazda CX-7 Grand Touring

8 Answers

Mazda cx7 engine noise

The engine makes a noise like a loose timing chain slapping against the timing cover only at start up when oil pressure is low for 2 seconds and goes away. no noise under acceleration or idle i changed the oil and also replaced the timing chain guide and hydraulic tensioner . noise still present, do you guys have any ideas?

Posted by on

  • Anonymous Nov 10, 2008

    I have the same problem, I changed tensioner but the noise is the same, I'm thinking what will happens if I change oil from 5W30 to 10W40, because in the cold morning there is no sound, no problem :(

    my e-mail is tazarr_1920@yahoo.com please contact me if anyone know the solution for this problem

  • mazdasux May 15, 2009

    mazda issued special service bulletin on this noise to replace variable timing adjuster and cover but noise still present after replacement

×

8 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 1,010 Answers

Does the engine have hydraulic lifters? If so air can get into the chamber under the lifter and cause lifter noise.

Diagnosis and repair requires removing the Valve Cover. A fairly easy job for your local shop.

Posted on Jun 29, 2008

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Just get rid of this car, because you are going to need a new engine soon, my 2007 mazda cx7 with only 33000 miles is at the dealer for engine replacement!!!! only 2 days after i purchased the car

Posted on Mar 19, 2010

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Not a good idea to ignore it. I heard this rattle sound at start up intermittently and after investigation Mazda acknowledged in 2009 by way of a Service Bulletin that there was a potential problem of failure with a "Oil Pressure Actuating Valve" if this is the correct terminolgy. Similar non turbo and turbo motors are in the mazda 3 and SP23 versions also. I have just bought a 2007 CX7 turbo with 46000kms on it, serviced and oil changed every 5000kms and full service history by a local Ferrari mechanic. After I asked questions, he apparently was advised by Mazda "that it was not an issue and normal for these motors". I have had 3 independent mechanics stating and including a report from the Mazda Service Techs that it could be an issue, even moreso long term. They are trying to cover up the issue of the defective valve and low oil pressure so would suggest that you pursue Mazda hard otherwise it will cost you approx $1000.00 to have it fixed.

Posted on Nov 14, 2011

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

A lot of ideas and opinions here but here we go,I've had a bit of experience with this recently,been a mechanic for over 30 years,replace your chain and tensioner and have fun getting the camshafts and crank to line up like I did cos mister Matsuda did not use keyways,but don't worry I have got it all worked out and the engine runs like a dream.If anyone would like to know let me know,thanks

Posted on Apr 17, 2015

  • Vladan
    Vladan Nov 16, 2015

    Con, please let me know more about this. Thanks

  • tenielle archer
    tenielle archer Jan 21, 2016

    Hi Con

    My cx7 just had the timing chain replaced. It fixed the initial knocking noise. However there is now a new noise that very similar. Only when you put the car into drive and also accelerate.

    Any ideas on what this could be? We used all the special tools to time it properly...

    Thanks
    Tenielle

×

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

But it still there after chain guides vvt actuator and soliniod have been replace around 2000 rpms there is a tipped niose

Posted on Oct 30, 2013

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I'm having the same engine noise on my 07 cx-7. There is a service bulletin from Mazda saying the variable valve timing actuator (VVT actuator) is faulty. If you are able to take the valve cover off of the vehicle you can see the VVT actuator. There are two notches on the actuator that are supposed to line up. The notches may be hard to see so you'll have to look closely. Turn the camshaft counter clockwise with a wrench until the notches are lined up. Then turn the camshaft clockwise approx 90 degrees. If the notches do not line up, that indicates the actuator is faulty. There is also another bulletin from Mazda saying the oil control valve is faulty. Some people refer to this as the VVT solenoid. This can easily be tested if the valve cover is off. The oil control valve is sticking up on the top of the engine. Remove the 10mm bolt holding the valve and it should slide out. You can use jumper wires to inspect this. Jump it with a 12 volt source. You should see it move.
Hope this helps

Posted on May 13, 2013

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

This happens in lots of four cylinder vehicles it onlys does it because of the low oil pressure dont worry about it its not a problem at all

Posted on Oct 11, 2011

  • Paul Williamson Nov 14, 2011

    Barry, not a good idea to ignore it. I heard this rattle sound at start up intermittently and after investigation Mazda acknowledged in 2009 by way of a Service Bulletin that there was a potential problem of failure with a "Oil Pressure Actuating Valve" if this is the correct terminolgy. Similar non turbo and turbo motors are in the mazda 3 and SP23 versions also. I have just bought a 2007 CX7 turbo with 46000kms on it, serviced and oil changed every 5000kms and full service history by a local Ferrari mechanic. After I asked questions, he apparently was advised by Mazda "that it was not an issue and normal for these motors". I have had 3 independent mechanics stating and including a report from the Mazda Service Techs that it could be an issue, even moreso long term. They are trying to cover up the issue of the defective valve and low oil pressure so would suggest that you pursue Mazda hard otherwise it will cost you approx $1000.00 to have it fixed.

×

I have seen and fix this concern, the varible timing adjuster needs to be replaced. Mazda techs have seen this problem.

Posted on Jul 21, 2008

  • mummyangela
    mummyangela Oct 09, 2012

    how to contact u?

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My car has a timing chain, when I start my car in the morning its very noisy then it quite down a bit,


noisy on start up is hydraulic lifter problem as they are loose until the oil pressure builds up. the adjustment is taken up and the noise goes
it mat have some noise from the chain until the oil pressure builds up as it has a hydraulic chain tensioner
you list it as a 2016 model and the only suggestion I could make is to go up a grade in oil viscosity
AS it is new the oil is probably 15w where I would use a 20 w 40 oil
run your engine against other new engines and see if the engine noise is louder ( use a noise meter ) and make the dealer do something as nothing gets quieter as it wears out --just louder

May 15, 2016 | 2016 Hyundai Elantra GT

1 Answer

Can the tensioner make the chain to be loose inside the engine an cause it to make noise an show sign of oil on the dashboard?


A loose timing chain tensioner will not cause the oil lamp to light. The noise you are hearing is most likely valve noise due to oil starvation. The oil light comes on when the oil pressure is too low to be safe for the engine. Most people believe it is to tell you the oil level is low. A low oil level can cause low oil pressure is the oil is below the sump, but low oil is not the cause of the light - low oil pressure is. This can be due to a number of things, such as a bad oil pump, faulty bypass regulator at the oil filter, loose sump pipe connection, or even an oil gallery plug that comes out internal to the engine. You need to stop using the vehicle immediately and have the oil pressure checked with a mechanical guage to determine if the problem is the oil ressure or the sensor that lights the light. The chain tensioner being loose CAN cause noise, and that itself is an issue that should be fixed, as in many vehicles a loose chain can jump time, or jam and break, and since many cars have interference engines, either of these scenarios can cause severe internal damage to the engine.

May 06, 2016 | 2007 Nissan Tiida 1.6

2 Answers

Hi I have this like going from low to high grinding noise near by the camshaft gear or the valve cover but about as high as the camshaft gear it does it after starting car and when start acceletaring and...


Sounds like a Belt or timing chain is slapping inside the Cover ,,, usually a sign that your Belt or chain tensioner is broken ,,, i wouldn't run it to long ,,as it will skip and do serious engine damage ,,GET IT TOWED TO A TRUSTED SHOP !!!

Mar 08, 2015 | Cars & Trucks

1 Answer

3.5 timing chain noise one sec on cold start


Oil pressure pushes the tensioner foot up against the chain. When the rubber face wears down it will come to the end of it's travel and then stop. High mile engines don't produce a lot of pressure on a cold start, so look at the pressure regulator in the oil pump and replace the timing chain tensioner.

Sep 07, 2014 | Cars & Trucks

1 Answer

When car starts slow has a rattling noise coming from the engine until it gets warmed up


My best guess would be that the timing chain tesioner which is hydraulic, is not supplying enough pressure to the chain and it's slapping against the guides. You might try using a lighter weight oil or switch to a 5w-30 synthetic and see if it resolves the problem.

Jan 08, 2014 | Nissan Xterra Cars & Trucks

1 Answer

A loud knocking noise and than the oil light comes on but just had a oil change than suv cuts off.


For some reason the engine is loosing oil pressure, the engine will shut off when the oil pressure sensor reads no pressure. The knocking noise could be the timing chain slapping against the sides of the covers as the tensioner is operated by oil pressure or a bearing problem. First check to see if there is the proper amount of oil in the engine, if so, I would recomend you have it towed to a Qualified Repair Shop that can determine the problem [ they can also document the problem in case you have cause to go back on the place the did the oil change ].

Mar 08, 2011 | 1999 Ford Expedition

1 Answer

Loud clicking noise coming from crankshaft pulley and goes away when a/c is on and when idle is higher. Why the noise?


Take a dry bar of soap and touch it against the sides of the belt(s) while the engine is running. If the noise goes away for a little while, the noise is from the belt settling into the grove of the pulley. Belts can really make loud pooping noises.

If this has no effect, then your timing chain may be too loose for the timing chain tensioner to compensate, and the chain is slapping against the inside of the timing chain cover.

If this is the case, do not let this condition go on. The timing chain cover is aluminum, and the chain is high grade steel. The chain will wear a hole in the cover if it is hitting the inside of it, and that is allowed to continue.

Jun 26, 2010 | 1994 Toyota Camry

2 Answers

Loud tick & knocking for a 1zzfe engine from 2001 toyota corolla


from what you are describing it sounds like a lifter/valve issue, i am a ford man i don't know if toyota do the same thing, but if they use inserts for the valve seats it is possible a valve seat has been dropping just has not dropped fully out to cause engine damage. buying a new engine will actually cost you less than an overhaul/rebuild anymore. the parts will cost you almost as much as a new motor will with all the machining that maybe needed.

May 13, 2009 | 2001 Toyota Corolla

1 Answer

Noise when start engine


I have the same problem with my CX-7, but I haven't find solution yet :( :( :(
They open the engine and replace the timing belt tensioner, but that was not the problem

Aug 17, 2008 | 2007 Mazda CX-7 Grand Touring

3 Answers

88 ford ranger 2.9 low oil pressure


Possibly clearances "closing" at operating temparature? 20w50? Kinda heavy isn't it?Spun bearing - should make more noise than a "Tap"? I've heard several low and high mileage 2.9 engines "tap" but quits after warm up? That SEEMS to be somewhat common with the2.9 Sorry can't be more specific.

Jun 28, 2008 | 1988 Ford Ranger

Not finding what you are looking for?
2007 Mazda CX-7 Grand Touring Logo

9,218 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mazda Experts

yadayada
yadayada

Level 3 Expert

61249 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Mazda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...