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Old 05-01-2011, 11:19 PM
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Too much pressure back to the radiator

I have an 89 camaro Iroc z 350 TPI punched out .30 over.We replaced the intake gaskets, and i drove it 7 miles and it over heated and blew a chunk out of the radiator sideing(plastic) so we got a Becool performance radiator, replaced the gaskets again, but now after i drive it and it gets to running temperature it blows the heater core hose off and sprays antifreeze all over. We had to wire the fan to a switch, 8.5mm spark plug wires from MSD. It also seems like its getting to much fuel, The exahust smell is really strong and after you start it it doesn't idol untill a little while of it running. HELP!!!!

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Old 05-01-2011, 11:46 PM
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You're putting either compression or exhaust into the cooling system. Blown head gasket, cracked head, cracked block, etc.
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Old 05-01-2011, 11:58 PM
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Blows the heater hose off but doesn't lift the radiator cap relief? Strange...

You have clamps on all your hoses?
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Old 05-02-2011, 06:29 AM
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First thing to check is the pressure cap to see if it's working.
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Old 05-02-2011, 06:50 AM
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you sure you have the system full? what pressure cao you using.? it should be in the 14-15 lb range and then make sure it is working. If you are blowing up radaitoras and hoses off the connections, you are definetly having more pressure getting into the cooling system.
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Old 05-02-2011, 08:06 AM
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Quote:
Originally Posted by my irocz!
I have an 89 camaro Iroc z 350 TPI punched out .30 over.We replaced the intake gaskets, and i drove it 7 miles and it over heated and blew a chunk out of the radiator sideing(plastic) so we got a Becool performance radiator, replaced the gaskets again, but now after i drive it and it gets to running temperature it blows the heater core hose off and sprays antifreeze all over. We had to wire the fan to a switch, 8.5mm spark plug wires from MSD. It also seems like its getting to much fuel, The exahust smell is really strong and after you start it it doesn't idol untill a little while of it running. HELP!!!!
Sounds like a bad thermostat. If the thermostat is stuck closed, the pressure can build (quickly) until something gives. You'd expect the pressure cap to allow the coolant to be expelled into the recovery tank, so if this isn't the case the cap is likely bad as well, but it could be that the pressure cap hose is unable to cope w/the quantity of coolant trying to escape- thus the blown hoses.

The fuel smell could be several things. To begin with, pull the codes to see what that tells you. Even if the CEL isn't lit, check it to see.

Be sure the air filter is clean and check real closely for any vacuum hoses that are bad or missing, etc. Also be sure there's no exhaust leaks before the O2 sensor. The spark plugs fresh?
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Old 05-02-2011, 10:54 AM
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^^^^^^^^^^^^ thermostat was also the first thing that i was thinking as i was reading down through this
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Old 05-02-2011, 11:08 AM
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You'd expect the pressure cap to allow the coolant to be expelled into the recovery tank, so if this isn't the case the cap is likely bad as well, but it could be that the pressure cap hose is unable to cope w/the quantity of coolant trying to escape- thus the blown hoses.

The rad cap wouldŽnt be seeing pressure if the thermostat is stuck closed.
I reckon the cap is good and the thermostat bad.
IŽd swap out both anyway to be sure.
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Old 05-02-2011, 11:58 AM
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Quote:
Originally Posted by malc
The rad cap wouldŽnt be seeing pressure if the thermostat is stuck closed.
I reckon the cap is good and the thermostat bad.
IŽd swap out both anyway to be sure.
The pressure generated has to go somewhere- like back out the return (bottom) hose into the radiator. There's also the bypass.
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Old 05-02-2011, 04:24 PM
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Also I might ask if you burp it. If there is a bubble in the system, sometimes that can cause problems, especially if it's by the CTS or thermostat because they need to be immersed in fluid to work correctly. It probably isn't your problem, just mentioning it because you should always burp the system when it has been worked on.
Also, many people mistake the acrid smell of a lean misfire exhaust for a rich exhaust. Both are the product of incomplete combustion but the lean exhaust will sting your eyes.
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Old 05-02-2011, 06:44 PM
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Why did you change the intake gaskets. Are you sure you are using the correct gaskets. I am also suspicious of the cap. It should release. The thermostat does not have to open for it to release. The thermostat will block flow but the pressure will be fairly equal throughout the system. The fact you blew a whole in the radiator proves that.
The cooling system pressure is controlled by the cap and the cap alone.
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Old 05-02-2011, 08:44 PM
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All the symptoms you have described point to a blown head gasket that is allowing cylinder pressure into the cooling system. I have chased this sort of like you a couple of times only to arrive at blown head gasket after spending a lot of time and money needlessly. On more than one occasion, removing the spark plugs revealed coolant in one or more cylinders. Running higher pressure caps and higher coolant temperatures are putting a strain on the lighter constructed cylinder heads, resulting in blown gaskets and warped heads.

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Old 05-02-2011, 10:12 PM
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if you think you may have a blown head gasket, do a pressure test on the system and get it figured out before you end up with coolant in a cylinder overnight. when this happens you will bend a connecting rod when you go to start the engine. cooant doesn't compress like air/fuel mixture does, so the connecting rods take the hit.get the car to a shop or beg/borrow/buy a cooling system pressure tester and do a test at whatever pressure the rad cap says. try harbour freight for a tester if nothing else, a kit won't cost you more than a tow to the shop and a test there, or another engine if you cook it. if you paln on starting it, I would at least pull the plugs to be sure the cylinders are dry before you crank it over.better safe than sorry.
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Old 05-02-2011, 11:06 PM
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Also remember, coolant pressure is much less than combustion pressure so you can have combustion leaking into the cooling system and it might not show up pressure testing the cooling system. They make a cheap tester to see if there are combustion gasses present in the cooling system. You need to do that test in addition to testing thew cooling system and cap.
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Old 05-03-2011, 12:37 AM
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Too much backpressure on the radiator

Fill your radiator and leave the cap off, then disconnect power to distributor so it can't start and crank the engine. If water spurts out the radiator you have a blown head gasket.
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