R reg toyota previa over heats. had new pressure cap n tested the head gasket so both of them are fine. is it likely to be the water pump? as its worse wen Im startin n stopping but seems fine wen Im driving even if I drive her hard

Head or intake gasket leaking into cooling system.start it with cap off cold and see if it keeps bubbling. If yes compression is leaking into cooling system.

Toyota Previa Questions - 93 toyota previa having white ...

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CarGurusMar 17, 2013 - 93 toyota previa having white smoke while starting and stu-off while running on the road. ... Lift the cylinder head off the engine block and move to oneside. Remove the ... 1992 Toyota Previa 3 Dr LE Passenger Van ... was going down the road one day and it just shut off. it will turn over but wont crank.Missing: water

Rough idle, bad hesitation on acceleration, perfect idle with ...

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1994 Toyota Previa Questions ... Idle is perfectly smooth for first 1 - 2 minutes after overnight cold start, before .... This may be because the throttle position sensor is signalling just off idle. .... My check engine light came on with PO-420 code. ... theengine was turning over under starter motor that would bring the engine to an ...

Re: Replacing a Previa head gasket. - ToyotaVanTech

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Dec 3, 2011 - 20 posts - ‎2 authors
Okay, so you've got a Toyota Previa with a blown head gasket. ... The next few pix are taken after dropping the engine out from the bottom using a ... You can see a definite path between the water jacket and the cylinder. ... I believe this was a result of #1blowing and over pressurizing the cooling system.

How to Change a Coolant Temperature Sensor - YouTube

? 26:00
https://www.youtube.com/watch?v=IXSp5ykI6po
Sep 16, 2012 - Uploaded by rehma6b0

- Check the radiator cap for proper sealing.
- Blow air from outside and inside of the radiator to clean the fine dust accumulated in the feathers and fins.
- Check the radiator for clogged inside. Clean the radiator after disassembling it.
- Check the water pump belt for looseness or wear.
- Check the thermostat valve.
- Check the cylinder head gasket or re-torque the cylinder head bolts.

Have a cylinder leakage test or co2 test done. my prefered method is a leakage test as it checks heads, head gaskets, valves, rings all in one test.

hi, it sounds like the head gasket has gone take out the spark plugs and check for signs of water also check the oil for signs of water as this to me looks and sounds like the head gasket has failed and will need replacing.

If water is not present then try starting the car with the coolant filler cap off and see if it starts if it does then this is head gasket failure if it still dont start then your going to need to get a compression test done and then this will tell you if the gasket is good or bad but to me it sounds like head gasket failure.

If the gasket needs replacing then you need to also check the water pump is working and also test the thermostat as any of these failing can cause the head gasket to blow again so make sure you get these checked ok.

Let me know how you get on or if you need further assistance ok

it is the head gasket blown from the cyl to the water jacket ,a radiator specialist can test for combustion gases in the water to confirm this ,but that is what it is . "youdoit"

The radiator or heater core might be plugged up, most likely the radiator.

Nope you have a shot head gasket or a cracked block

Fill the radiator with water and run the engine with the filler cap off

If there are lots of bubbles coming out of the radiator or the water flows right out of the top the head gasket has popped.

You can try the liquid cooling system repairs from Holts such as Radweld or there is a powder called Ce-lit

Both are stop gap repairs

The head needs to come off be skimmed and pressure tested

If it passes that then it is a new gasket and a re-build

change the thermostat,,also make sure the radiator cap isnt faulty,,if there ok you could have a blown head gasket if the water if backpressuring very high from the radiator,,

It sounds like the rotor button is not making a good connetion. i recommend replacing the distributor cap and rotor button to be safe. It is a cheap solution.