The Toyota Landcruiser Owners Club

[LC G-Model]

Hi,

Hope some one can guide me on this issue.

I have a FZJ 80 4.5l petrol G-model 1996 version. Think the code is actually 1 FZ-FE (although the E seems to stand for fuel injection and mine is definitely not). Bought it in Egypt in 1996. Great car. However, not known in the UK which makes parts and tuning more complicated. Car is standard as bought.

Two weeks ago got a vacuum leak. No power and shocking to move. Repaired that but the engine did not return to its beautiful self which it was before the vacuum leak, which I cannot understand why that is. At low rev it does not run smooth and smokes blackish. This seems to indicate a too rich fuel mix. High rev seems fine (although I have not measured the fuel consumption just yet). Obviously fuel consumption is up. The carb has two chambers. One with the usual bits where the valves are cable controlled and the choke valve sits and one (separate) chamber that contains a valve that is very hard to move and seems to be vacuum controlled. If it opens slightly at idle it makes the uneasy running a lot worse as it seems to flood the carb with fuel. If closed it is better, but not entirely smooth. Is this valve supposed to move this difficult? Can this actually move by the vacuum if it moves difficult by hand?

Does anyone know where to get the carburetor settings from for this engine/carb or does anyone know what the problem could be? Bought a Haynes manual that is supposed to cover this engine but does not show anything on this double chamber carb.  

Thanks so much for your help.

[Google]

[DaveN]

I think the engine code is 1FZ-F. Do a bit of googling with that and see if you can find anything. I think they sold the carb version in 2nd and 3rd world countries.

[LC G-Model]

Thanks DaveN. The engine code is indeed 1 FZ-F. It was indeed sold in many developing countries. The car we bought 18 years ago and still drive was bought in Egypt. Did loads of internet research. No posts anywhere with the topic of Carb problems for this carb and this engine. Its even hard to find any reference to it. Not even the Haynes manual that is covering this engine covers this specific carb, let alone the second chamber of the carb where the stuck valve (which seems to be related to my issues) is sat. It just mentions 'carb body'. Very helpful ! I have found a similar carb now on alibaba from Hangzou in China. I have approached the seller for more info and price. Also if they sell parts.

Having  gone through all the issues I now believe it could be related to a cast in diaphragm that is meant to push-turn back the rod on which the second stage valve is mounted in the second carb chamber. That particular diaphragm, which is encased on the side of the body of the carb (so cast in), seems to be meant to push the valve rod back through an external connection between the diaphragm and the valve rod. However, when you move the connector into the diaphragm on its own it sounds very different from any other diaphragm. As if it is torn and hence no resistance at all.

It also makes no difference when you do this with the engine running.

So far my updates. I will keep searching and if anyone can offer any suggestions please do. When I am able to post pictures (am too new to do this currently I will.

[andy]

Some parts for sale here, http://shop.cruiserparts.net/index.php?main_page=index&cPath=44_4820&zenid=bd69c80d86dd8601d3f7b229e39097d8
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It's Not a Bl**dy Jeep it's a Landcruiser
150 series Invincible X
100 Series VX Limited
Mercedes Sprinter 311 Luton
1993 VX80 4.2td SOLD
1996 Hilux Surf SSR-G Intercooler Sold
1994 Hilux Surf SSR-V Sold

[LC G-Model]

Thanks Andy,

Had a look. Unfortunately the carb on my LC is slightly different (if I could only post a pic . I must have bought a very special model back in 1996 but it has done us super service for the past 18 years.

Got it back up and running to a decent standard now but still not entirely smooth at idle. Just about time as going on a 4,500km road trip with it in two days.

I will keep trawling the forums until I have a solution. Just applied for the LCOOL forum as well to see if I can find some details there.

Will keep you posted.

[LC G-Model]

Well well,

Completed the 4,500 km trip without a glitch! Fuel use as before. What a car!!

Have not solved the issue yet though. Seems like the vacuum leak triggered the double choke valve in the second carb chamber to open, enough to flood the carb with loads of gasoline and trigger the engine to stumble at idle. Chamber was a bit blackish so think that is because it had not been working for a while (and maybe never has...). Guess that has to do with power at higher rev but as it has enough of it I never noticed.

The vale of the double choke is on a rod and that rod does not move freely. In fact you have to push it to move. This was my fail safe when the problem would happen again during the road trip, push the rod to get the valve to shut again but I never needed it.

So, now that I know the rod is the problem, I am looking for a refurbish kit for the carb to get the rod (and hence valve) moving again.

Will keep you posted on progress.
ATB