Outer Limits 4x4 Board

Ok well i posted a while ago about my Patrol on Dual Fuel

Here is a recap.

Every now and then the car will play up on LPG as in it will splutter as if its missing or something. Took it to a mechanic, they looked at it, checked out the LPG setup, mixtures, plugs, leads. All worked fine for 2 days,

went to fill her up at the local servo (mobil) and as soon as i did that, 2K's went by and it started to happen again. Just wondering if the tanks get crap in them or something? or if there could be another problem like the electrics on the tank or what. dunno at this point

I think I have the same thing happening to me.

93 TB42 Dual Fuel.

Ever since I bought the car 2nd hand its always sputters and " misses " when I accelerate, even worse when driving uphills.

If I didnt know better I would come to the conclusion of it being a miss, however it rarely happens on petrol.

It had buggered me for ages trying figure out whats causing this? and also the fact that I didnt have the time and funds to take it into a lpg mechanic.

Anyways I did a tuneup, changed the spark plugs and leads. This course of action improved the drive immensley but it was there just not as often. It still annoyed me.

I then invested in a expensive set of spark plug leads, got myself a set of Top Gun premium leads that specifies LPG compatible, which means its has less resistance. Normal leads have around 10,000 - 16,000ohms resistance apparently. Since we are running gas that is too high of a resistance. The leads I got if I recall were like 6000 - 8000ohms resistance and LPG compatible. The set would have costed me around the $100 mark.

Since putting these leads in I have solved about 90% of the "misses" and it doesnt bother me that much anymore.

I am now keen on replacing my spark plugs also because I bought them for the standard petrol engine. I spoke to the spare parts place and he said you shouldnt be using standard plugs if you are on LPG, I cant remember if he said it needs a cooler or hotter plugs but Ill find out when the time comes. I also need to change my dizzy and coil pack to make the whole ignition system 100%.

I have already replaced the tune up bits with standard items so Ill wear them out before doing hte above but Im confident that the misses is due to not having enough spark.

MyGQ wrote:Ok well i posted a while ago about my Patrol on Dual Fuel

Here is a recap.

Every now and then the car will play up on LPG as in it will splutter as if its missing or something. Took it to a mechanic, they looked at it, checked out the LPG setup, mixtures, plugs, leads. All worked fine for 2 days,

went to fill her up at the local servo (mobil) and as soon as i did that, 2K's went by and it started to happen again. Just wondering if the tanks get crap in them or something? or if there could be another problem like the electrics on the tank or what. dunno at this point

Hi

Does it do it more under load? If so, please check your spark plugs and particularly the plug gap. I've had similar thing with LPG power vehicles before and it always comes down to spark as LPG needs a good spark to operate correctly.

I'm not saying it couldn't be a whole range of things including a buggered LPG converter etc, and I know you said your mechanic has checked your plugs but just make sure the plug gap is right and that the spark is strong.

I have a VK 308 Calais years ago which was on LPG and was 2 years old having only travelled 30,000 kms and had the same problem. After 2 "mechanics" and LPG specialists looked at it, they had me convinced the cam had shit itself and I was about to pull the motor down when I thought I would try new plugs and the problem disappeared. Even with the factory high voltage ignition fitted, it turns out the once the plugs had a little bit of age on them, they would play up.

Hope this helps.

Cheers
Simo

there is a strainer type filter in the solinoid under the convertor, you may want to check that out.

Casey

Also gas mixtures are ment to be about a 70/30 mix when produced, and if the companies as a little sort of the 30% mixture they don't really care and make about an 80/20 mix. This could also be causing some probs too, don't know how they get away with it tho. Pitty something can't be done like the ethenol.

Mere