1fz-fe running rough

Submitted: Friday, Jun 13, 2008 at 18:19
ThreadID: 58726 Views:15505 Replies:11 FollowUps:1
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I've had this 80 series for about 3 months, about 2 months ago I had an impco lpg system fitted. So far it has been running great on gas.

Last Friday it started running rough on both gas and petrol, as though it has dropped a cylinder. After a bit of research I realised that you should run colder series spark plugs when running lpg, so I fitted NGK Iridium plugs. Then the engine wouldn't start at all. So I pulled the plugs back out rechecked all the gaps and refitted them, still no start. I put the old plugs back in, still no start. I then called out NRMA who couldn't diagnose it either so the next morning it was towed to the auto electrician.

He worked out the problem as the air flow meter and after having it reconditioned i finally got the car back today. The air flow meter only fixed the problem of it not starting not the rough running. But it is still running rough, the same as it was before I changed the plugs. The auto elec reckoned it was just a coincidence the air flow meter failed while i was changing plugs.

Does anyone have any ideas? It is rough at idle and under acceleration?
Any help would be appreciated.
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