Bongo Fury

When I first got the V6 12 months ago it had a slight misfire when on LPG.......new plugs/dizzy cap/rota later it was "almost" cured. (ran lovely on petrol)
The rota seemed to be the item that had the most effect.

9,000 miles later and the misfire came back and worse every day (LPG only)

Fitted a new dizzy cap/rota and little differance although the contacts in the cap were badly burnt....

Phoned Paul at LPG Imports and he said check the Plugs....the LPG is very hard on them.

Not fitted the new ones yet....(waiting for a bit of copper grease)

Think Paul could well be right.....will let you know.



All plugs were exactly the same with a 1.20mm gap

The dizzy cap/rota arm I just fitted were from a reputable supplier and cost £32 and £11 respectivly.

As I always like to have spares of all consumerble items I have just received from the Bongo Shop (Ian Maynard) a spare Dizzy cap and rota arm priced £55 and £20 (approx)

As is often the case in life you get what you pay for......the differance in quality is remarkable....much better made and substantial. Both with the DENSO mark and in a MAZDA box.

Hi Hayden,

the lower plug looks to be an irridium one. In mine I found the irridium (IK16 from memory) the best for starting and running, however they are very pricey.

I dropped back to standard NGK ones and just changed them every year as they are pretty cheap, I did reduce the gaps by 10% from recommended as this helps too.

Hope the plugs fix the problem. All good otherwise?

Andy

Hi Hayden,

the lower plug looks to be an irridium one.

Correct ????

Bongo always starts really well but of course it always starts on Petrol.

Everything else good

I use Iridium sparkies in my LPG Toyota ...

When I changed them earlier this year the four year old one still looked like brand new ..

I also changed the Dizzy cap ..rotor and plug leads all with 'Blueprint' compatibles .. one very close microscopic inspection they seemed 100% identical to the OEM Toyota parts they replaced..



I also use Flash Lube ..metered to one drip every 10 seconds (on tick over) ... maybe this helps with the upper cylinder lubricant...

How many miles had the plugs done....Perhaps the "flash lube" helps the plugs ??

I considered "flash lube" but after much research decided against.

The valves are supposed to be hardened on the V6........and flash lube can cause problems with the Lamba sensor.

Changed my plugs. along with dizzy cap and rotor, end of last winter, when starting (on petrol) became unreliable. Solved the problem immediately, although I'm sure it was the dizzy cap and rotor which did the trick, as once I got the old plugs out, they were clean as a whistle (as they should be on LPG), with no discernible wear and correct spark gaps.

They had done more than twice the mileage of yours though Haydn, and yes, I do use Flashlube but doubt that was what kept them so pristine - no lambda sensor probs, BTW.

Like you, I keep "consumables" on the shelf, which was really the only reason I changed the plugs along with the dizzy bits - belt and braces. The garage which serviced the van, the previous summer, had also concluded the plugs were good, and hadn't changed them, so they were still on my shelf - NDK, not iridium, both the old and the new.

Don't know what service interval your LPG system recommends but you could be due for new filters and/or re-mapping about now, or soon, anyway? If the plugs don't do the trick, and everything else stacks up (e.g., HT leads), I would get the LPG filter changes/annual service done and see if that makes it fly again.

Thanks for that......will see how it goes with new plugs and go from there.

Get a diesel - you know it makes sense

Now you've started a debate Mike.

Nah, no debate!

(Asda, Queensferry. LPG 69.9p per litre - what's to debate?)

haydn callow wrote:When I first got the V6 12 months ago it had a slight misfire when on LPG.......new plugs/dizzy cap/rota later it was "almost" cured. (ran lovely on petrol)
The rota seemed to be the item that had the most effect.

9,000 miles later and the misfire came back and worse every day (LPG only)

Fitted a new dizzy cap/rota and little differance although the contacts in the cap were badly burnt....

Phoned Paul at LPG Imports and he said check the Plugs....the LPG is very hard on them.

Not fitted the new ones yet....(waiting for a bit of copper grease)

Think Paul could well be right.....will let you know.



All plugs were exactly the same with a 1.20mm gap

I did not realize that the lower plug anode is ment to be shaped to a point..
So perhaps the fault is not with them...I will fit the new ones to-day and see what happens

Fitted the new plugs and got a road test .....fingers crossed ...all now good...

This is interesting.

Fitting the Correct Spark Plugs for LPG - CNG or Petrol
Check to see what spark plugs you have fitted in your vehicle, if you have platinum or Iridium tipped spark plugs fitted they are No good for LPG or CNG there is No such thing as an iridium or platinum LPG spark plug! we recommend you replace your spark plugs with Genuine LPG / CNG spark plugs > Brisk Silver Spark Plugs are made for LPG - CNG & Petrol they have solid silver electrodes to produce a superior spark as you can clearly see in the chart below Silver has the highest Thermal & Electrical Conductivity where as Nickel, Platinum & Iridium are very poor, Silver spark plugs come in two types (YS) single electrodes for all vehicle types & The (LGS Premium) type multi electrode type theses can only be fitted to modern vehicles with electronic ignition systems they are not recommended for older vehicles with ignition points or poor ignition systems, the LGS spark plugs are specially designed by Brisk to produce incredible sparks across 2.9 mm gaps in a 360 degree firing pattern - theses are special spark plugs they cannot & do not require any adjustment they are ready to fit

http://www.ebay.co.uk/itm/BRISK-DOR15LG ... 53e520c283

I've seen similar 'blurbs' before even for Polish spark plugs that are advertised as being the bees knees ..

NGK (who sparkies I would rather have then most) do 'dedicated' LPG plugs ..

This is a good LPG Forum to ask or pick up tips 'n info ..

http://www.lpgforum.co.uk/index.php?sid ... c241b92d20