Hi, replying to your question about the head gasket. He only took a look he never done any pressure tests or anything else as far as i know. The guy dropped the car of with out me getting a chance to talk to him and just left a message with my friend who originally brought the car up to him. From then on he has been impossible to get hold of, so as you can see i felt none the wiser.
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Re: mr2 head gasket
Hooking up proper test equipment to the engine is the best way to check for a bad head gasket; usually, air is injected from a air compresser hose into the spark plug holes, with that cylinder having the valves closed. If coolant starts to bubble out of the coolant filler tube, it would then be safe to pronounce the gasket bad. Try some SteelSeal.
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You are probably right as all codes refer to misfire in cylinders.. have a compression test done to check for blown head gasket and cracked/warped head and have a cooling pressure test done also to show cracked head and other than head gasket.
Have you done a wet compression test on all the cylinders, which entails squirting some oil (about 1/4 cup) into the plug holes to help seal around the rings and re-doing the compession test.
If the pressure goes up by a fair amount (40 - 60 Lbs) then it is definitely the rings but if it only increases by around 20 lbs then it is either valves or the head gasket is leaking between #2 & # 3.
I would first suspest a warped head , especially if engine hsa been run low on coolant and allowed to over heat.
Removal of the head can be done with engine in place. Once off, check the face of the head with a straight edge and if not true have it machined by an engine reconditioner. While the head is off, it may be advisable to check the valves and valve seats for wear and replace the valve stem seals as they tend to be worn and and hard due the age of the vehicle. If the engine is fitted wth a timing belt it may be advisable to replace this also if more than 50,000 miles / 80,00 Km has elapsed since it was last changed.
Check all the wiring connections that you loosened or took off when you removed the head. something is loose or disconnected ,eg., ground wires .
Make sure you have spark at spark plugs whemn cranking ,and fuel pressure.
Did you try spraying starting-fluid in the intake, see if the engine runs for a little bit.
Compression to be anything above 100 psi will firean engine ,sometimes lower too.
if yoiu have an oil pressure gauge is the pressure good? check the pressure and also cjeck the thermostat and water pump those are major causes of overheating if you have water in your oil ( check dipstick for 9oil and if its foamy and light brown you have a head gasket problem if not its something else of what Imentioned)