Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: tonaz on February 20, 2011, 07:59:11 AM

Title: jeep cherokee 1994 4.0 with lpg - what spark plugs, oil, h-t leads?
Post by: tonaz on February 20, 2011, 07:59:11 AM

hi everyone.

as above, i have a 1995 cherokee. it's the 4.0 petrol and has an old lpg conversion. it has 179,000 miles on it and i was wondering whether there was a specific oil i should be using considering the amount of miles it has on it?

i was also going to change the spark plugs and h-t leads... it doesn't make a difference to what type i need due to the fct it has an pg conversion does it???

i'm new to jeep ownership and lpg in general but want to learn and do the work on this myself where i can.

thanks, i look forward to your responses.

tony.

Title: Re: jeep cherokee 1994 4.0 with lpg - what spark plugs, oil, h-t leads?
Post by: big g on February 20, 2011, 08:27:17 AM

Those I6 motors seem capable of double your mileage so I'd be putting a fresh batch of the recommended grade.

As for plugs many recommend Brisk but they come at a premium over std stuff.

I've only used std plugs with the gap closed slightly over factory spec.Never had a problem personally.

Guess it depends how much you want to spend.

Title: Re: jeep cherokee 1994 4.0 with lpg - what spark plugs, oil, h-t leads?
Post by: daggie on February 20, 2011, 09:43:22 AM

 :imwitstupid:

Title: Re: jeep cherokee 1994 4.0 with lpg - what spark plugs, oil, h-t leads?
Post by: tonaz on February 20, 2011, 07:46:06 PM

ah right cheers for that. that's reassuring to know! is there anything special i should be doing with the up keep of it considering the lpg conversion?

Title: Re: jeep cherokee 1994 4.0 with lpg - what spark plugs, oil, h-t leads?
Post by: tim_aka_tim on February 21, 2011, 04:05:11 PM

Buy the factory fit Champion plugs from the dealer, they're dirt cheap.

The oil you should use is in the lubrication guide http://www.birtydastards.com/frm/index.php?topic=8091.0 (http://www.birtydastards.com/frm/index.php?topic=8091.0)

Title: Re: jeep cherokee 1994 4.0 with lpg - what spark plugs, oil, h-t leads?
Post by: ChrisS on February 22, 2011, 11:40:53 AM

I was advised by the LPG installer that did the conversion on mine last week to reduce the lifespan of plugs and igniton components by 20% or so from normal service schedule to avoid potential problems.  Sounds sensible to me.