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My 2nd generation Toyota Hi-Ace Diesel is not starting easily, or occasionally not starting at all.

I have: Tested the glow plugs - all quick and fully bright; Changed battery; Changed the air filter; Changed the fuel filter; and Run Liqui-Moly injector cleaner through, and added Liqui-Moly to diesel.

I think the outside temperature is having an effect but need to be able to overcome this. My next step is to install new glow plugs in the hope that there is some undetectable fault with the existing ones. Is this a good idea? Or are there any better ideas out there? Thank you in advance.

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closed as too broad by DucatiKiller, Nick C, Pᴀᴜʟsᴛᴇʀ2, George, Fred Wilson Jan 6 at 2:12

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

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Not really an answer for you, but I think replacing the glow plugs is a good next step. Seems like you are going through all the troubleshooting I'd do to get it fixed. – Pᴀᴜʟsᴛᴇʀ2 May 12 '14 at 12:30
    
Like Paulster, not an answer but maybe try cleaning the throttle body as well. Its an easy and simple job. – MeltingDog Jan 12 '15 at 1:44
    
OP has not logged in for over a year and a half. Looks like more info is needed. OP has never responded to questions. Going to vote for deletion. – DucatiKiller Jan 5 at 6:19