Thread: 95 D1 running like a shocker

Hi all.

My 95 V8 auto 3.9 has developed a bad misfire when hot - cold its pretty good. Excellent compression and no vac leaks.
To summarise within the last 12-18 months its had:

1. New genuine LR pick up coil in the Dizzy;
2. New genuine Amplifier HEI module;
3. New Plugs;
4. New HT leads;
5. New LPG Converter (3 months ago) and vapor pipe;
6. Rotor Button;
7. Dizzy Cap;
8. New genuine Lucas coil.

I have read that the Discos tend to miss within a very short time with aftermarket rotor buttons. I just put on a new one a month or so ago, branded Lucas, but I picked it up from Repco and its not genuine LR. The cap looks good but its about 12 months and 20,000 old (aftermarket). I have not tested each lead. If it’s the module I will be surprised because it should last more than 18 months (certainly the Bosch ones in Commodores etc have a much longer life).

The misfire is much worse on LPG, but thats to be expected because of the better flame front that it needs.

Any ideas?

Cheers

Thanks Phillip - yep its on gas also so that should rule that out largely. It an OEM one Magneto Marnelli for a range rover 3.9 of the same year - same specs only difference is size of pully which I changed for the old one.

Cheers