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Slapping noise from timing belt area on cold start.cannot feel anything hitting cover.

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Posted on Jan 02, 2017

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SOURCE: mazda cx7 engine noise

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

SOURCE: 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

Posted on Nov 10, 2008

  • 6982 Answers

SOURCE: replace timing belt slapping against plastic cover

No way I can guide you through a belt replacement without re-writing a manual. If you've ever done a chain before, its the same stuff, just a belt instead of chain. Make sure tension is correct and that timing (index) marks on cam & crank pulleys are aligned properly. If you find any oil leaks in there, fix them before replacing belt. Get a manual... The job itself isn't that difficult, but is time consuming.

Posted on Jan 01, 2009

  • 43 Answers

SOURCE: knocking noise coming from belt area. when belt

It is very common for the harmonic balancer on these to fail and it sounds like an engine knock. It almost stops when you remove the belt. With belt removed, try to turn harmonic balancer, if it turn back and forth, it is bad. You need to replace it.

Posted on Nov 01, 2009

SOURCE: A loud noise around the

Dear SIr,
As you saying noise wont come in driving and only comes in idle , it means noise will not come if RPM is high by norma in idle l, try this one start the car don't drive it just raise RPM(rotation per minute of only engine not vehicle speed) in neutral gear , if noise disappear that mean it a problem of drive belt . If drive belt is got less tension then also it can occur or belt is damage, replace belt problem will solve, (for reference drive belt it drive alternator,powersteering pump,A/C compressor that is made by rubber).Thanks if any problem ask me.

Posted on Nov 02, 2010

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1 Answer

Engine got a knocking cold start, silint when hot

It has developed a clicking engine noise on a cold start. After the car has warmed up, the sound goes away. ... Clicking or a sharp tapping from the valve cover on top of the engine would point to a valve train noise. A dull tapping or slapping sound from the side of the engine block would point more toward piston slap.4 Nov 2011

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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 !!!

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Motor makes a noise at high speed like timing chain is slapping the cover

could be anything from belt noise idle pulley noise to lifters or injector noise is it a knocking noise is your check engine lite on I think I would have a mechanic look at this issue before it becomes a breakdown

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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.

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1 Answer

Bad slapping noise.

could be something with the timing chain system. There were some complaints about the chain slapping the cover and even a good number regarding failure for these cars. If it's anything more than a slight tick I would, or have a professional, take a look at it. If one of the guides, or the tensioner, or even a link in the chain itself let go it can spell big trouble if you try to drive it.

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Do you have the defrost on when it is doing this? Turn it off and see if it goes away. I'm still thinking A/C compressor.

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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

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