Thread: backfire through air box

Originally Posted by LRDV8

Hate to say this but the mixer systems just don't work on the Disco's..... I have a 2000 model disco and had a mixer system installed about 4 years ago.

It started backfiring about 6 months after the conversion and basically kept happening on and off for the next 4 years.... had it tuned, cleaned, MAF replaced, coil packs replaced, leads, plugs .... you name it I tried it. Usually got better for a while then back to backfiring eventually...

Finally cracked the **** and had the mixer system ripped out and binned and replaced with a full injection system.... can't say how happy i am, not one issue since.

Wasn't cheap at $2750 but I got the rebate again (as it was over 4 years from the original conversion) so it was only about $1500 at the end of the day. I would have spent at least $2000 trying to fix the backfiring before finally cracking the ****s.

Good luck !!

Where in Melbourne did you find someone to install an injection system for $2750? That's a good price.

Originally Posted by Sully

Where in Melbourne did you find someone to install an injection system for $2750? That's a good price.

The only reasons lpg backfires are running too lean and poor spark. Have run lpg for years and no backfires if tuned correctly. Maybe your system wasnt installed or set up properly.
There is a set of tanks you can get that fit under the sills and hold 35l usable per side. You dont have to have a cradle as they have mounts welded to the tank set, and of course there is no need to touch the std petrol tank. Speak to Sean at Roverparts 1300760125.

Toyota 100 series land Cruisers run those 35 litre sill tanks with welded-on brackets. I can't see how they would fit on a D1. Pictures please? Ground clearance would be compromised badly. The 19 litre APA ones lose 50mm clearance as it is.

l've found with 96 3.9 on gas is very finicky
leads and plugs have to be spot on , timing too
l had a 4.1 cortina '76 on gas for 20 years super reliable easy and cheap to fix and after the dizzy was re-jigged to 10% BTDC from the normal 6% there was hardly any difference from pertol heaps of power
with the landrover however!
l've found that the vaacum lines had tiny cracks at the ends and this affected
the backfiring
two airboxes later had a cheap after market air filter($15)
as to fuel economy 300 kms oer 70 ltrs city 350kms highway
thanks for sharing info very helpful

could where you get your lpg from make a difference? mine seems to backfire more if i get my lpg from the big w servos


or am i just imagining that

Originally Posted by Kelli

could where you get your lpg from make a difference? mine seems to backfire more if i get my lpg from the big w servos


or am i just imagining that

Not impossible, I have had plenty of people report running issues with different brands of autogas. Autogas is a mixture of different gases, the suppliers aren't all using the same. However if it backfires repeatedly there's something not right with your vehicle's tuning.

Very interesting about all this backfiring. Mine (98 D1 3.9) has had a couple of backfires (3 from mem over 6mths). Firstly thanks for the advice on the plugs and I'll check those out shortly, but have no idea what I'm looking for with the leads. Secondly I was given a new (none LR) MAF and was wondering is it just a case of plug-n-play or do they have to be calibrated? Lastly I've heard the Woolies/Coles LPG is not the best and filling up from ELgas or Supa Gas is by far the prefered option. Lastly my system is 6yrs old and like some others here, I'm most interested in this '$2,500 system' and being able to claim the rebate again. What's the deal there? Oh, P.S.....I love my disco, quirky or not

Originally Posted by Gremlin

Very interesting about all this backfiring. Mine (98 D1 3.9) has had a couple of backfires (3 from mem over 6mths). Firstly thanks for the advice on the plugs and I'll check those out shortly, but have no idea what I'm looking for with the leads. Secondly I was given a new (none LR) MAF and was wondering is it just a case of plug-n-play or do they have to be calibrated? Lastly I've heard the Woolies/Coles LPG is not the best and filling up from ELgas or Supa Gas is by far the prefered option. Lastly my system is 6yrs old and like some others here, I'm most interested in this '$2,500 system' and being able to claim the rebate again. What's the deal there? Oh, P.S.....I love my disco, quirky or not

Bosch have a good lead set in their catalogue for the D1. It can also be done with individual leads from a Bosch ignition lead merchandiser if your auto store has one, a slightly different fit but does the job.

Don't know about the MAF, it either fits or it doesn't.

The rebate is currently only $1250 for fitting a new system, I wouldn't bother, just spend the money on yours. I don't think you can claim two rebates on the same vehicle in any case.