Question about 1996 Jeep Grand Cherokee

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Cylinder not firing on my 2.5l diesel cherokee sport, recent overheat due to jammed thermostat, vaseline like grease found in cooling system covering thermostat and housing. Any ideas on where I start to find out why it's not firing?

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  • torusblade Jul 31, 2009

    Thanks for the incredibly quick reply, didn't put all the info in, It's actually firing on 3 cylinders quite happily just a 4th that's not, my fault for not putting all the details in.

    Also it lives in deepest spain with rough dusty roads and high temperatures as a constant, the previous owners just didn't look after it so I'm playing catchup right now.

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O no the head gasket has blown in the vehicle, the head must be taken off, file down at a head center and new head gasket put on. thats why its not starting, engine can't build up compression

Posted on Jul 31, 2009

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1 Answer

Where is the sensor for regulating the temperature R


There is no electronic coolant temp regulator. That is what the thermostat is for as it regulates the flow of coolant between the engine and radiator by opening and closing based on coolant temp. It is mechanical in operation and operates independently of everything else. If it is faulty and is stuck closed or partly closed you will get an overheat condition.

If you still have an overheating problem after what has been done then it could be due to one of these factors if all else is ok...

1. Air remaining in the cooling system retarding coolant flow. It is imperative that all air is bled from the cooling system or you will get an overheat condition cause by air blocks. If you still see bubbles appearing in the coolant this is an indication that there is still air in the system or you may have the issue described in 3. Manufacturer procedures need to be followed for effective air bleeding of the cooling system after radiator coolant has been changed.

2. A partial blockage in the radiator or in the engine retarding coolant flow due to a build up of debris.

3. Combustion gasses leaking into the cooling system via a failed head gasket will cause an overheat condition. This will show up as bubbles in the coolant when the engine is running and can be checked by doing a leak down test on each cylinder. You might also have some coolant escaping into the cylinders and white exhaust emissions can be an indication of this. If you have been running the engine in an overheated condition this can very easily cause a head gasket to fail and a cylinder head to warp or even crack.



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I take it that you have pulled the oil pump off the engine for some reason and now want to make sure that it will pump oil when the engine is started . If that is the case take the end cover off the pump body and fill all around and in the teeth spacings with Vaseline or clean grease. This fills up the spacing between the gears and the body where the oil is moved and creates the vacuum necessary to suck the oil up from the sump. The grease or Vaseline will melt down and intergrate with the oil.

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But if it overheats without the AC on, then the first thing you need to do is check the cooling fan and see if it operates! There has been a lot of problems with the cooling fan relay on this model. If that isn't it, then move to changing the thermostat and checking the water pump.

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You can not run any vehicle without a thermostat. Check to see if the coolant fan comes on?

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1 Answer

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Overheat with no heat usually has two possible causes. First, the coolant level has run low due to a leak (find leak and re-fill system)
Or, you have a failed cylinder head gasket that is permitting combustion pressure to enter the cooling system driving the coolant out of the heater core (usually you will find coolant in the oil, oil in the coolant or have white smoke at the tail pipe...some or all of these)
Comon tests for that are a radiator hydrocarbon test, cooling system pressure test or a cylinder leakdown test.
Hope it turns out to be something small!!!
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1 Answer

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