machanical problem

Why not take it to a sacond machanic so you gat 2 opinions.

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hi - i have 90 series prado on gas and twice have had problems running really rough etc. Once even blew bottom off air box. My mechanic has always said if there is a problem you change plugs and leads and it nearly always solves all problems with them (gas vehicles).

I checked by google and other forums (pradopoint, LCOOL etc) and most say that there are only a couply brands of plugs and leads you should use or you will have problems. I suggest you go over to forum on LCOOL site and ask there or even on the Pradopoint forum for which brands to use and then check what you have now.

Also, do you get it serviced by a LPG qualified mechanic and get him to adjust idle etc each time at service or do you do it yourself or what? Would also be worthwhile taking it to another gas certified mechanic - (hard to find a good one sometimes - where are you located?) - after you check out the plugs/leads i mentioned, and ask him to put it on the analyser and see what he reckons its running like and then get him to change plugs and leads and adjust it. Hopefully then will be ok?

After my air box drama i read about an "air sock" that some put in to minimise any dramas from that, but i have yet to follow up and see if i should follow suit and do it too. So far still running ok, just way too thirsty for LPG, it should be running better economy wise. I know after i get my mechanic to adjust each time it runs heaps better then. I also have valve saver fitted and its chewing up too much of that too. Just cant remember which way i turn it to adjust the flow so I am leaving it until i finally see my mechanic next at rego time due in about 2 weeks. Be interested to hear if new and different plugs and leads together with a different mechanic putting vehicle on the analyser will solve your problem, cheers....

hello shanebo.
it sounds like the mixtures of petrol and the gas take it to a gas installer let them adjust the mixtures, this happens to my ute it is an easy fix? good luck cheers bill.

Alltrac at Mile End are very good with landcruisers (won't be the cheapest).
When were the valve clearances last checked or adjusted? Its just that when you run that motor on gas, they need to be every 40k instead of 80k because of valve seat recession.

Sounds like you just need to find a good gas installer / repairer. There are plenty of dodgy 1's around, especially since the Govt rebate scheme came in..

When I had a L300 on gas / petrol, it had similar problems to your prado. Took it to a gas mechanic I know in Ryde and he re-tuned it. ( he also has a dyno )
and ended up with the same power output figures for Petrol & Gas.
If you've already changed plugs and leads, it sounds like a tuning problem to me, but could also be an issue with the filter in the converter, which can be overhauled...

Steve

are you running upper cylinder lube like Morleys or something? Have seen a few 80 series where the clylinder lube bottle is mounted in a position where the oil siphons into the engine when the engine is off.

This coats the plugs with oil causing it to run like a dog until it warms up. Colder plugs will make it worse. If anything a hotter plug will help the oil build up burn off.

Otherwise.....I agree with others. Have your shims adjusted. (Tappets)