Disco backfired this morning on gas :( What to do?

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Originally Posted by Young Angus

Well that all sounds like stuff I can definitely do...apart from the 'selling' bit because I like this car and I'm keeping the faith for now ;)

The only thing I'm lacking is time to do it all. It actually only started happening after the really crazy wet weekend we just had so I wonder if water has got in anywhere where it shouldn't be. I've also noticed that the petrol tune is out as well so it's not just on gas but petrol at least runs okay still and doesn't backfire. The backfire didn't sound too nasty so hopefully didn't do any real damage but I've heard they can wreck stuff :(

Fingers crossed, I'll see what I can turn up.

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You've been puddle bashing! Brings back memories. I would be looking at all the plug lead boots, they should be a tight fit and waterproof. If not chuck the leads. Pop the dissy cap off, polish it outside (with a dry clean rag) and dry inside the dissy with a long blast of hair dryer.

Well had a look in the dizzy and in the boots of the leads and no moisture. I was actually hoping to find some since the problem didn't come up until after the crazy storms we had on the weekend.

The leads are "performance 8mm" and the rotor button a "lucas" one. The coil is Bosch and all looks like it's been in there for quite a while so I might just give it all an overhaul and see where that leads me. I want to get all the ignition new anyway so I at least know it's all up to date. Just the money thing :( I'm going to Japan next Monday and don't have money to be throwing around too much.

I still don't know what an ignition amp is though...hopefully whatever it is won't need replacing because it sounds like the most expensive part of the ignition system...

Ignition amp: This gizmo takes a low power signal from the dissy magnetic pick up and creates a high power switching current to fire the coil. It lives attatched to the dissy on early V8's and at the LH side of the radiator in the later ones. Search for a pic of it, its about 40x50x10mm in size and is screwed to a metal heat sink.
I would chuck the Performance leads, I haven't had much success with them. And the plugs. When you get back. Have a good trip!

I also had a quick look on the Bosch website and they have a specific LPG plug range which sounds good...but I can't figure out where I can actually buy them from yet. Supercheap Auto seems to stock Bosch but I can only find the straight platinum ones, not the actual LPG ones.

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Originally Posted by Young Angus

I also had a quick look on the Bosch website and they have a specific LPG plug range which sounds good...but I can't figure out where I can actually buy them from yet. Supercheap Auto seems to stock Bosch but I can only find the straight platinum ones, not the actual LPG ones.

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Stick to the list I gave you earlier, what's on that list is based on years of experience handling backfires on Discos, RR's and other EFI vehicles.

but if you want the platinum plugs go for the WR7KI33S. They run cooler and better suit freeway/towing use. Any Bosch stockist should be able to order these in for you. The platinum plugs won't make your car run any better than the WR7DC+ plugs for the first 25 000km, but they will last much longer. You pay 3x as much and they last 3x as long. I'd rather look at my plugs every so often.

Yeah I'm not interested in longer lasting plugs, all I liked about the lpg ones is that the gap was already set on them for gas and I wouldn't have to mess about setting them myself.

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Originally Posted by Young Angus

Yeah I'm not interested in longer lasting plugs, all I liked about the lpg ones is that the gap was already set on them for gas and I wouldn't have to mess about setting them myself.

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But it only takes a couple of minutes to gap the set of plugs, it's no big time consumer.
I always check preset plugs anyway before fitting.
I have found boxed and set plugs to be out in gap a few times. Especially if someone may have dropped the plug after taking it out of the box before you bought it.

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Originally Posted by It'sNotWorthComplaining!

But it only takes a couple of minutes to gap the set of plugs, it's no big time consumer.
I always check preset plugs anyway before fitting.
I have found boxed and set plugs to be out in gap a few times. Especially if someone may have dropped the plug after taking it out of the box before you bought it.

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A very good excuse to buy a set of feeler gauges, they aren't expensive.:) Mind you, if the box says 0.8mm gap and they don't look damaged you will get away with it.

supercheap do sell the bosch plugs they are in packs of 4 and you have to look for the number on the packet to match what bee utey said they work well and do keep the motor at a better temp (been using them for about a month ) and there not that dear.

Okay sounds great, thanks so much for the advice guys you are awesome...and are helping me to become a better mechanic :D

Is there any way to test to see if my coil is getting a bit tired or would you just replace it anyway? What sort of coil should I get...anything specific? They don't seem too deer either...

Is setting the actual tune and timing something I could do myself or is that a gas specializing mechanics job? ie. does a computer have to be plugged in and the parameters entered by a specialist or can I just flash a strobe over the belt and tune it old school? I haven't checked the other sections of the forum yet and I will but I won't be doing it for a little while anyway.