Question about Toyota Previa
The toyota diesel does not survive over heating very well, you need to check the compression, we see the piston rings brake after an overheat condition, and there is not enough compression for the engine to run, we also see a ton of cracked cylinder heads after an overheat. also make sure the valve timing has not jumped, but best guess is broken rings, most of the time you can remove the oil fill cap and turn the engine over and see if there is excessive crank case blow by if there is you will need to replace the piston rings or engine.
the fuel system is very basic and only has one power control to the fuel cut off, if that wire is hot wile cranking the engine then there is nothing wrong with the ignition circuit, there is a small chance that there could be a problem with the injection pump, and i can give you a few tests for the pump but you need to check the compression first.
let me know if there is any thing else i can do for you.
Posted on May 26, 2011
You need to perform a compression test to verify mechanical intergirty of the engine. Given that it has overheated at least twice from you have stated, it is possible that the head gasket has been damaged and requires replacement. Check your oil and see how it looks. If there is water in the oil system, you will need a head gasket. 1. check the oil 2. if the oil is good, run a compression test. Let me know what you find.
Posted on May 25, 2011
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Posted on Jan 02, 2017
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