Question about 2004 Cadillac Deville

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Engine knocking noise

Soon as you start the car it begins knocking. Its coming from the engine. Also it has trouble getting up and going when you push the gas after stopping

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  • 71 Answers

Bad connecting rod bearings.

Posted on Aug 26, 2014

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Posted on Jan 02, 2017

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SOURCE: SERVICE ENGINE SOON

Sounds to me like you have a fuel issue. Try replacing the fuel filter and run a good injector cleaner through the motor with a couple of tanks of high octane gas. The service engine light can easily be tripped by weak detonation in the combustion chamber, causing very poor performance as well. Good place to begin before you start dumping $$ trying to figure out whats wrong.

Posted on Aug 06, 2008

wmsfarris
  • 22 Answers

SOURCE: 1979 cad fleetwood brougham knocking sound from,engine

Sometimes collapsed lifters or loose rocker arms can cause knocking sounds in an engine. However, the fact that there was a possible loss of oil pressure and that the knocking gets louder as the rpm's increase, would indicate that there is damage to a connecting rod bearing and possibly the crankshaft. If the latter is the case you are looking at a fairly substantial repair bill.

Posted on Apr 14, 2009

  • 60 Answers

SOURCE: 2003 CTS 3.2L threw serpentine belt. Car made no

you bent a rod get the motor from someone other than dealer they will soak you

Posted on Oct 03, 2009

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1 Answer

1989 -1990 350 big bear it has a knocking when starting but after a few mins it warms up doesn't seem to knock as how can I fix this


Depends where the knocking is coming from, what sort of knock, how loud it is, what speed and whether it is load and speed dependent.

It is important to have a rough idea of the location or source of the knock in order to decide whether to dismantle or not and if dismantling what to begin checking. Even if you had the patience to make the sound heard with words it would be no substitute for an experienced person hearing it.
Also different people describe noises differently and hear them differently.

Aluminium is a common material used in such engines and it expands about seven times more than steel as it heats up and this is the principle reason why cold engine knocks can fade after warm-up and why some cold engines are silent and are noisier when hot.

Listening through a stethoscope or a large screwdriver is an aid to locating the area of the knock. A load dependent knocking indicates piston or connecting rod problems and if the noise becomes louder and more harsh on load or as the speed increases it signals trouble sooner rather than later

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next time light comes on go to auto parts store and they can check it with their scanner and tell u the problem for free

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The lifter rod is out or you cracked your piston mine did the very same

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The check engine light is telling you the computer has a problem with something that will affect performance and emissions, when it flashes the problem is serious and can damage the engine or engine parts.
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I have a 1997 2.5 jeep wrangler.when you first start the engine it runs and sounds fine, then after about 20 seconds it begins to have a knocking sound only at idle. when you press the gas you cant hear...


It may be piston slap. This is caused by either engine wear with the piston bores being too large for the pistons, or by poor manufacturing tolerances, or a combination of both.

To test for this, start the engine up first thing in the morning and run it for about thirty seconds while you listen carefully and memorise the sound and intensity. Turn the engine off quickly, remove the spark plugs and put two squirts of motor oil into each cylinder. Reinstall the plugs, start the engine up again and listen. If you have piston slap the noise will have been greatly reduced or even eliminated for about thirty seconds seconds and then returns.

The fix is to rebuild or replace the engine, but if it works just fine then don't worry. Many slappy engines keep going for tens of thousands more mile. The fact that your knocking is only at idle suggests your crankshaft is not to blame.

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Not good to have a knocking noise.
An engine knock can be serious signs of engine failure coming soon....whatever it is have it looked at right away before you have a complete break down on your hands.

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sounds like a lifter spring load or hydraulic? or maybe top end rocker whats the restart like on it ??? surge up and down??

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what area of the car does it come from? it could be any of the engine pulleys and hopefully not but could be the rods knocking inside the engine

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