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I posted this a while back but I forgot to post in this section. I've added a few photos at the bottom as well. First off, I am not a mechanic so my terminology may annoy some of you! I did this as i was getting a lack of power at about 2500revs mainly in higher gears. It has improved dramatically. Fuel efficiency seems to have improved but only slightly so I can't say for sure. For this guide, I refer to right and left as you stand at the front of the vehicle looking into the engine. I know this is not the norm so apologies if confusing. Front refers to the front of the car as standard. Also, the elec. connectors are the biggest pain in the &%$£. Trying to squeeze the clip and pull at the same time is so difficult as they are usually well stuck in place being nine years old! Don’t give up! Job time – 10 hours over two days (I didn’t have a guide so hopefully you will do it faster – it would take me about 6 hours if I did it again) Set up tools, bench, laptop, etc. (1 hour) Disassembly (5 hours) Cleaning (2 hours) Reassembly (2 hours) Basic tools are required but just having a good socket set is very important. Not necessary to jack up vehicle but would help. I drove the front wheels up on 3inch blocks. This is the order I did it in, you may want to do it a little differently. I include headings for the most part but in general this order worked well. Here we go!... Covers: Remove primary engine cover Remove RH engine cover Remove LH engine cover Remove front engine cover Remove under engine covers (x2) Battery: Disconnect battery terminals Remove battery horizontal support brace Disconnect the electrical connection on the LH side of the battery cover Remove battery cover Remove battery Remove base cover of battery Remove battery vertical support brace Remove control module under battery (x3 bolts – long one goes on RH side) Disconnect 3 elec. connectors on control module Remove bottom battery case (x3 bolts) EGR: Remove EGR pipe and gaskets Disconnect EGR elec. connector Remove EGR valve Radiator: Open radiator cap and drain ***** (have bucket ready to take ~5 litres) Drain fluid Remove air intake duct above radiator Disconnect inlet and outlet pipes of radiator fluid reservoir tank Remove reservoir tank Various: Disconnect fuse box wire harness clips (x2) Disconnect common rail front end elec. connector Disconnect common rail fuel supply hose Disconnect common rail rear end elec. connector Remove wire harness support bolts (x2) Various: Disconnect EGR valve rear end elec. connector Remove five wire harness clips (red arrows) Remove harness support (green arrow) Remove sponge adjacent to EGR valve Various: Remove bolts (x3) on water pipe (blue arrow) below EGR assembly Remove clip at front end of pipe and slide hose off Remove vacuum hose (small) from water pipe (underneath) Remove elec. connector under vacuum hose & remove clip also (hard to see but you’ll know it has to be disconnected) Push hose assembly out of the way – towards battery area (no need to fully disconnect) Air Flow (Throttle) Assembly:- Disconnect three elec. connectors on air flow unit Remove bolt on air flow unit Common Rail:- Remove common rail bolt (x2) Remove common rail fuel lines Protect (tissue) the common rail connectors & ports Remove common rail and keep clean Inlet Manifold: Disconnect vacuum hose from inlet manifold Remove inlet manifold upper stay bolt (it’s a vertical support that can be hard to see) Remove air flow pipe to inlet manifold (1 clip also) (difficult to remove for me but keep twisting and pulling – there is a lip to overcome) Loosen inlet manifold lower stay nut (very difficult to access – hard to even see. This was the most awkward part of the whole job. You should really disconnect for easier access but it would be impossible to get it back on – loosening and pushing it aside was fine for me) See diagram below. Remove bolts (~x9) on intake manifold Remove intake manifold Cleaning: Clean inlet manifold – I used a power hose, carburettor cleaner, screwdriver for scraping & kitchen paper. Clean inlet ports – as above but I used a hoover continuously to prevent as much carbon as possible entering the valves/cylinders Reinstall in reverse – much easier than disassembly! Prime the fuel system. Photos: Photo 1 - Inlet ports exposed after inlet manifold clean. Of the four ports showing, the first has been cleaned mostly, the second is as found, and the third and fourth have some cleaning done. Highly recommend using a hoover if scraping any carbon from here. Otherwise just coat with carburetor cleaner and wipe away with a cloth. Photo 2 - Inlet manifold removed. Condition hard to see but constriction increases further into the ports. Photo 3 - Inlet ports - two untouched and two partially cleared.
Maroon400 posted a topic in LS 400 / Lexus LS 430 / Lexus LS 460 / Lexus 600h ClubI thought it might be useful to write a blog of my experience of LPG conversion from start to finish. Today I will be dropping off my 1999 mk4 LS400 to Battersea Autogas to have a BRC system with auto flash lube fitted. I have requested they remove the inlet manifold when drilling to prevent swarf entering the engine. They have complied with my request without reservation, when I drop off the car I will also insist on photos being taken of the engine with the manifold off for confirmation. My experience with Marco at Battersea Autogas so far has been excellent, so let's see how it goes!