Question about 2003 Chevrolet Silverado 2500HD

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Cracked cylinders? 2003 chevy Duramax, pampered, serviced regulary,130 k miles,3 cracked cylinders, anybody heard of such, could it be a defect???

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  • lookin4ubaby Dec 06, 2008

    yes,and I live in South GA

  • lookin4ubaby Dec 06, 2008

    Also, this truck from purchase date got incredible mileage, 24mpg in city, 34 on road, no complaint there.This model had a recall on fuel injectors if they went bad for 200k miles as GM put in faulty parts. Though I never experienced any symptoms of them being bad(i have a 2002 model also that had to have them replaced) I was wondering if there was apossibility of the injectors malfunctioning and leaning out the fuel, causing the cracks. I had my cluster replaced the week before all this happened also Had lots of electrical problems prior to and after cluster. Any other ideas?

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  • Chevrolet Master
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Did you have a minimum of 50% antifreeze in cooling system ??doesnt sound like it

Posted on Dec 06, 2008

  • Colin Stickland
    Colin Stickland Dec 06, 2008

    where south ga??is it near spain??only joking now what are you describing as cylinders ??cylinder head between the valves in and around the combustion chamber or is it direct injection?.the cylinder liners/bores,also what are you calling a cluster??injector pump??

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What should the psi compression be thanks.


It can vary between make and model of car. However, a general rule of thumb is that 135+ average is okay. Less than 85psi is pointing at something seriously amiss in the engine.

It can vary - some cars may have 125psi as 'average' compression.

Don't expect each cylinder to give the same compression reading as there will be a fluctuation. Another general rule of thumb is that there shouldn't be more than 10% variation between the readings. That is, if cylinder No1 is 135 psi, cylinder No2 shouldn't be less than '125 ish'.

If you suspect you may have compression issues, it's quite easy to do a bit of fault finding. Warm the engine first so that the pistons are expanded in the cylinders. Then do a dry compression (normal) test.

Here's some examples of compression tests on a 4 cylinder engine:
130 127 129 127

All compression readings are within 10% of each other. Fine.

Example 2:
95 95 129 127
Here, a low compression reading on cylinder 1 and 2 suggests a problem. It may be due to a faulty head gasket/cylinder head allowing compressed gases to be transferred via the defective head gasket from one cylinder to another.

Example 3:
130 80 129 127
Cylinder No2 has a problem. It's compression is way down. The other three cylinders are fine. So .. what is the cause of the low compression on cylinder 2? It could be a broken ring/cracked piston or a burnt exhaust valve.

This is where you do a second compression test - called the 'wet' test.

Squirt some light engine oil into each cylinder. Aim for the cylinder walls so that the oil can find its way down the walls and around the piston rings. Place a rag over each spark plug hole and spin the engine to expel excess oil.

The oil that you have sprayed into each cylinder will form a 'seal' around the piston ring. Do another compression test and note down the readings. Here's example 3 again:
Example 3:
130 80 129 127
.. with the low compression on cylinder 2.

If after carrying out the 'wet' compression test you have a reading along the lines of
130 100 129 127
suggests that the bore/piston rings in cylinder 2 are at fault. The compression has increased on No2 cylinder because of the oil forming a seal around the rings.

If there is no increase in psi on the wet test i.e
130 80 129 127
This suggests a burnt exhaust valve.

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1 Answer

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easy answer call dealer give the them the vin (last 7 should do) and you should have an answer. I would be sure to have your service records in hand when you do drop it off for warranty work,

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1 Answer

What can cause a cylinder 1 misfire in a 2003 Chevy impala with a 3.4 liter engine


Misfire reasons.
Bad ignition coil (there are 3 of them), bad spark plug, bad spark plug wire (most common) defective fuel injector, intake manifold vacuum leak, low cylinder pressure due to burnt valves or scored cylinder walls.

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2 Answers

Fuel in oil on 2002 chevy 2500hd duramax


THE DURAMAX ENGINE INJECTORS GO BAD AND SPRAY TO MUCH DIESEL AND IT FILLS THE CRANK CASE UP 200 THOUSAND MILE WARRANTY COMMON PROBLEM DON'T DRIVE IT ANY MORE IF U HAVE BAD INJECTORS.

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2003 Chevy needs transfer case replaced for the 2nd time


I just had my transfer case rebuilt on my 2002 2500 silverado duramax. They told me that the spring that holds the pump inplace in the transfer case wore a hold through the case. He said this was common on these transfer cases. Chevy has not acknowledge the problem. He designed a steel plate, with flanges that holds the pump in place and will not wear a hole in the case again. And as far as the post to engage it once a month, the chain turns even when in 2WHL drive.

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1 Answer

2003 Chevy 2500hd caught on fire


your problem was the electric seat motor. I had the same thing happen on passenger side while driving,fortunately smelled smoke, looked under seat and pulled motor wire loose.

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1 Answer

#4 Cylinder (sleeve dropped) continued...


We have a 04 discovery with the same problem except it is cylinder #3. It has 62,000 perfectly maintained miles on it. There are three other 04's in service for the same problem. It is a defective motor and you shouldn't have to pay for their inability to make a motor that last's less than 100,000 miles or much more!

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