Rumble in the force

[Steven 90]

There is a rumble low in the revs on my 3.5 Land Rover V8.Feels like a bit off a stutter.
I replaced the coil ( one month in use and it leaked oil) sent the company a email to complain...
New spark plugs, leads, cheked the distributor cap.
Set the ignition @ 8 degree before ( car only runs on lpg)
Cleaned the lpg filter and piping ( verry dirty).
Cleaned the air filter.
Not a lot of result, i feel loss of low down torque because it is a offroader this is not fun. Also it is a auto.
It feels like it is just not getting enough lpg however i don't see how this could be so i suspect the ignition.
Have no idea anymore

[Darkspeed]

What plugs?

[Steven 90]

What plugs?

NGK bpr 5.
Have used them for years. No problems with them.
I checked the distributor and the rotor has a bit of play sideways and the rotor axle i can move this a lot up and down is this normal ?
( couple of mm).
I am thinking about a new distribitor and new ignition.
Strange thing is that it works now better and the only thing i did was dismantle lpg mixer and airfilter and reasemble. And fiddle with the distributor to check for play.

[Steven 90]

http://www.ebay.co.uk/itm/Range-Land-Ro ... 232a01e03c

I am thinking about this kit.

[ChrisJC]

Do you know if the LPG system is working properly?, it could be lean at the low end?

Chris.

[Quagmire]

Does it do the same on petrol?

[Steven 90]

I havent run on petrol for about 8 years (no petrol tank anymore).
I rebuilded the engine 2 years ago.
Cheked the lpg system, i replaced the valve on the lpg tank it sometimes would not open and sometimes it stayed half open.
I found a lot of black dirt in the valve so i cleaned the lpg pipe and the lpg filter. Also i cleanded the lpg mixer with compressed air.
I am really thinking about changing the distributor and everything arround it with rpi stuff. However it is not cheap and i must be certain this wil fix the problem.
The company from the coil powerspark are also willing to make me a deal on a new kit so dat is good news

[DaveEFI]

Several reports of these cheap copy distributors failing.

The shotgun approach isn't a good way of fixing a fault - even if it does, which in this case isn't certain.

[Steven 90]

Several reports of these cheap copy distributors failing.

The shotgun approach isn't a good way of fixing a fault - even if it does, which in this case isn't certain.

Verry true !
However nobody seem to can tell me if it is normal :
I can move the rotor shaft up and down a couple of mm.
Can move the shaft sideways a little bit.( a lotless then a mm).
A bit of play roting the thing sideways to the non advancing side.
The whole ignition system has done about 280 000 km and is used off-road so lot of water splaches and mud. And hot temp under the bonnet.
I also like the mallory system sold by V8 tuner and rpi however rpi doesnt sell them anymore so why ?

Regards Steven

[kiwicar]

Hi
From that description I would say it was normal play for a 280km old distributor, ie it is thoroughly worn out. In light of the fact you run this on LPG and that really shows up any weekness in the ignition then I think the "shotgun" aproach is entirly apropriate in this case, change the lot for good quality new kit. If the cam has done more than 100,000km I would change that and the tappets at the same time, the drive gear on the cam will also be shot and the cam lobes will be worn.
Best regards
Mike

[DaveEFI]

Up and down movement is normal, as is a small amount side to side. The gap on a VR pickup ain't anything like as critical as points. As regards the actual spark rather than timing, it's only the amp, rotor arm cover and leads which are going to effect this - not wear in the dizzy. That could effect timing, though. But could be checked using a timing light and home made advance scale.

[DaveEFI]

Hi
From that description I would say it was normal play for a 280km old distributor, ie it is thoroughly worn out. In light of the fact you run this on LPG and that really shows up any weekness in the ignition then I think the "shotgun" aproach is entirly apropriate in this case, change the lot for good quality new kit. If the cam has done more than 100,000km I would change that and the tappets at the same time, the drive gear on the cam will also be shot and the cam lobes will be worn.
Best regards
Mike

Just out of interest, what do you reckon wears out in the electronics of a dizzy to cause these symptoms? A worn dizzy can well cause incorrect timing - but this is relatively easily checked.

[Steven 90]

Hi
From that description I would say it was normal play for a 280km old distributor, ie it is thoroughly worn out. In light of the fact you run this on LPG and that really shows up any weekness in the ignition then I think the "shotgun" aproach is entirly apropriate in this case, change the lot for good quality new kit. If the cam has done more than 100,000km I would change that and the tappets at the same time, the drive gear on the cam will also be shot and the cam lobes will be worn.
Best regards
Mike

Just out of interest, what do you reckon wears out in the electronics of a dizzy to cause these symptoms? A worn dizzy can well cause incorrect timing - but this is relatively easily checked.

Checked how ?
And how can i test the amp under the coil ?

[DaveEFI]

The amps generally work properly or fail totally. Not known one to sort of work.

You check the centrifugal advance by fixing a timing disk or strip to the crank pulley and using a timing light.

[Steven 90]

The amps generally work properly or fail totally. Not known one to sort of work.

You check the centrifugal advance by fixing a timing disk or strip to the crank pulley and using a timing light.

I have a timing light, and there is a scale on the crankshaft pulley, when i apply throtle the timing changes is this wath you mean ?