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  • Toyota Model
    Colorado Landcruiser

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  1. Hello Rupert------ I have changed the SCV s several times on our Land Cruiser D4D 3 L......... I was told by the Diesel specialists that 99% of the time when the fault occurs as you mention no power and intermittent acceleration sometimes bad enough to go into get you home mode which is not very nice if you've got 160 miles to go ! On the last few occasions I do not take it for granted to change both valves so as to pinpoint which valve is faulty. 2 years ago I noted that the green valve was faulty but today 23 Jan 17 it's the Red one that is at fault............ I'm told that one is low pressure and one is high pressure but which one is which as I would like to know. The specialists told me TOYOTA have shelled out a fortune replacing those valves under the three year warranty! I found it does not seem to matter where the valves are bought from regards longevity and it might be worth noting that 4 valves can be bought from china for about £130 but the ones in London area are £129 a pair. I have sometimes been successful cleaning those valves but it is not successful with some. I will be having a shot at cleaning a couple that I know are faulty with methanol in a sealed small bottle...... I've seen it said that 12 volts can be applied to actuate these valves but I use 6 volts which does actuate them but one valve burnt out with 12 volts applied to it so the correct voltage cannot be satisfactory at 12 volts... I can confirm that 6 volts does not damage them but 12 volts may well bugger them and the cleaning material is flammable so if a fire is not to ensue the valve must be enclosed in the appropriate diameter bottle or tube with the cleaning fluid in it thus isolating the bottom of the valve at the top O ring to air !
  2. Denso suction control valves a problem that is universal. I have yet again changed the suction control valves in our D4D Landcruiser but my intention was to isolate by process of elimination this time which of the red or green valves was at fault. It's all very well there being a so called kit to replace the valves as one diesel engineer said we usually replace the pair then you are sure the fault is cured...... There are many who think it right to change the whole pump at around a grand !!!!!!!!! All I will say is that I fitted a pair of valves and as usual from Mr Thomas diesel -Kent for £160 the pair. Perfect as usual with the blistering exceleration this vehicle is capable of as opposed to the symptoms of get you home mode with the engine management light on & crap embarasing uphill slug crawl. A day later I changed the red 096710-0052 valve for the one that thousands of advisors would say --'swap it for a new un'. The road test proved that the valve removed earlier was not faulty at all and was perfectly serviceable. I will before long stick the 'old' two year old green one in & see if indeed the engine becomes faulty again as a matter of interest and of course with economy in mind as well. We shall see?
  3. I was told it is possible to clean the contaminated valves by ultrasonic cleaning and can now confirm it is possible....... A diesel Technician at P.Atkins of Mansfield Notts. told me not to throw the existing faulty valves but that it might be worth a try at cleaning them. It often transpires that trying to clean them in the normal fashion does not succeed 100% but cleaning them by the ultrasonic method does indeed work 100%..... The method is to immerse the valves to be cleaned in 3.5% caustic solution of de-ionized water for 10 minutes then 10 minutes in 5% citric acid solution of deionized water. Flush 10 minutes in plain de-ionized water. Remove and dry and immerse in Isopropanol for a few minutes and open and close the valves with a 6 volt battery well away from the highly inflammable isopropanol. The method of actuating the valves with the 6 volt battery is used while the all above cleaning operations are carried out. The 2 wiring circuits are fitted by 2 mini lucar connectors so there is no arcing at the valves. No immersion of the plastic shrouds is advised but they should be watertight but it would be well advised not to wet this part of the valves. Note --- Do not exceed 40C at any time....
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