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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
repairpal.com > Questions > Toyota > Previa > 1994 Toyota Previa
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 ...
www.toyotavantech.com > Forum > Technical Discussion > Toyota Previas
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.
- 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.
There are several likely causes, none very rosy:
1) head is warped (was it surfaced and/or straightened in conjunction with the new head gasket?).
2) gasket damaged during installation.
3) head is cracked.
4) block is warped and/or cracked.
If you are committed to the car I'd recommend finding a re-manufactured head from a quality supplier and have it professionally installed. That covers 1 -3. #4 is very difficult to access without removing the engine from the car and taking it apart and having it magnafluxed. The only sure thing is a complete engine with a warranty. Cost of the reman engine is probably in excess of the value of the van.
Good luck
It could be the thermostat replac eto be sure but also check to make sure the cooling fan is coming on periodically observe engine idling after the motor warms up the fan should come on after 5 - 10 minutes idling if not replace either the fan relay or the coolant fan switch
The toyota previa uses a formed silicone gasket for the valve cover and the cover is held in place by metric shoulder bolts ( 10mm). The valve gasket leaks because you can't get enough preload on the bolts to re-seat the old gasket when it gets old and shrinks. The shoulder bolts only allow you to tighten the gasket enough to seat the shoulder on the bolt. If you continue to torque down the suspected bolts, you will snap the bolt off ( don't ask me how I know this ). You can either 1.)replace the old gasket with a new one or 2.) remove the existing bolts around the leak area and put in new metric bolts that do not have a shoulder. You may want to put in a small sleeve into the existing bolt hole but shorter than the thickness of the valve cover to account for the smaller diameter bolt. You can now torque down the bolt and get enough preload to seal the valve cover without removing the old gasket. Make sure you use a torque wrench ( in-lbs) or be very careful not to snap these small valve cover bolts.
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,,
the impellors in the water pump are prone to corrosion,especially if no or incorrect radiator additives have been used .this will cause water to stay in motor & boil whilst the water in the radiator stays cold because it cannot circulate.try flushing radiator ,installing a new thermostat (which is more than likely not opening )& radiator cap,refil with correct additive,.if the car still over heats then you will need to replace the water pump.bugger!!
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