Question about 2008 Mazda Cx 7

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Ihave abnormal sound on ignition on starting engine

There is loud sound on starting engine and continue like knocking of hammers the sound heard at the left side when you look to the engine

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You have a rod knock. Do not drive this car until you have this looked at by a professional. Drive this car and the engine may self destruct.

Posted on May 16, 2010


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Posted on Jan 02, 2017


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Have a Isuzu 4hg1, assembled the engine and started it. I run it for two kilometers n hear the knocking sound n believe its a fuel knock. How can I fix the abnormal sound?

at idle only, when,does it knock.... wow.
no car stated, sure a huge truck,, 4.57 Liters
what truck? my guess NPR huge.
is the TURBU -T 4HG1-T?????
Applications include the 2000 Isuzu NPR350A
what year.?
what country?
we know its a diesel"H"
but old ones all knock, (detonate)with mech,injectors, (for sure at idle !!!)

on a new trucks not(with common rail,? direct injection and smart EFI controls)knock ends.

see the old engine
has 9degree injector pump timing
do that? got that?
the new NPR trucks sell this same engine
with Direct injections,knock?
,my guess. a leaking injector DID. if new truck>?
direct injected, is it?
or EFI brain stuck on limphome ,mode ,scan it?

see why not staying year, is IMPOSSIBLE:
the engines in 2000 are NOT same as now,
totally different efi fuel systems.1024092b-cf5d-4452-8e68-40060a48c7e5.jpg

Feb 17, 2017 | Isuzu Cars & Trucks

1 Answer

What makes my truck knocks when i cranked it up a loud pop sound and then it started knocking

comment on petrol or diesel
in any case have a compression test done to check for mechanical failure

Sep 25, 2015 | 2008 Ford F-150

1 Answer

Engine Knocking.

I would expect the engine is damaged.
You'll need to check the oil pressure and try to narrow down the area where the sound is coming from to proceed.
A very loud knock is probably a piston or rod bearing.

Feb 16, 2014 | 2008 Hyundai Sonata 2.4

1 Answer

Loud engine noise or knocking when AC on

Have your air compressor for your air tested. Sounds like its bad.

Aug 26, 2009 | 2003 GMC Yukon XL

1 Answer

Car died....driving on the freeway and heard loud clicking sound, pulled over turned car off....hasent started ever since... No smoke or smell from car..Battery still works.. when i go to turn on it just...

Sounds like your motor was starved of oil or had an internal malfunction. Possible rod and main bearing damage causing the motor to knock then lock-up. Check your oil level, if there is none or its low, this is the cause of the loud clicking/knocking. Have a mechanic check it out, you may need a new engine or major engine repair!!Hopefully this helps

Jul 28, 2009 | 2002 Suzuki XL-7

2 Answers

Trying to figure out where the knocking is coming from, on engine

It all depends how loud the knock is. A tapping valve can be caused by low oil level, or dirty oil. Topping up or changing oil will solve the problem. A really loud valve tapping is abnormal. Cars sometimes make what you call a spark knock when accelerating hard. Extremely loud knock coming from deep within the engine is a bad sign, which means the engine has failed. Further examination would reveal metallic residue on the dipstick.

Jun 27, 2009 | 1994 Ford Thunderbird

1 Answer

Car has loud knocking sound. gets louder with rev of engine.

Here's what you don't want to hear...A loud knocking noise from inside your engine is generally caused by a crank or rod bearing...when caught very early, sometimes they can be replaced. however, once the noise is loud, the attending crankshaft journal gets "hammered" out of shape and the job becomes very expensive and in most cases more costly than engine replacement. There is one other item that can cause a loud knock...your flywheel. Bearing problems generally cause low oil pressure. If you have that, it's gone...if not, have the flywheel checked before sending the engine to the scrapyard.

Jun 14, 2009 | 1987 Toyota MR2

1 Answer

Car wont start

 I heard a loud knocking sound when i turned the ignition
This may have been there a long time but you are only hearing it now because you are anticipating a problem. If it is only at the very first, it could be either the solenoid you are hearing or simply the teeth of the starter and flywheel not meshing quietly.
If it seems to be cranking too long, I'd check the fuel pressure up front; there is normally a capped valve that when exposed looks a lot like a tire valve. If you let it crank briefly  (maybe 2 seconds) and then poke the valve to open it, you should have pressure there if the system isn't leaking somewhere and losing pressure. If it is, you are waiting for fuel to arrive.
Long cranking is most often caused by a wait for fuel to arrive from the gas tank.

Dec 06, 2008 | 1994 Toyota Camry

1 Answer

1985 BMW 325e will not start

rcaf arrow: The clicking sound id probably your starter solenoid. Tis solenoid is actually a relay that connects your starter to the battery so the starter can turn the engine over to get it started.
Try knocking the starter with a hammer, (not real hard, just kinda medium) and see if that makes a difference  I suspect your starter is going bad.
Any indication of prior problems with starting?????

Nov 11, 2008 | 1985 BMW 3 Series

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