when I did my HG's on my 4.6 Thor, I replaced the coil backs, as I was there. one lasted all of a month. it was intermotor brand not the OEM bosch. luckily I kept the OEM bosch, still on it, and its been fine. the thor uses a redundant spark so it sparks twice, one for mixture ignition, the other, well redundant. Thanks for your reply, I’ve answered below. Also the engine is BOSCH.
what coil pack went on ? no reason to say that hasn't failed ?
when were the plugs last changed ? I go through a set of plugs every year as LPG does eat them
Just changed plugs and from memory it was Bosch coil pack x 2.
air, fuel, spark. the v8 doesn't manifest a non sparking cylinder well as the other 7 cover it well.
if you unplug the maf does that make a change ?
We will test that today. The problem is that problem is intermittent.
bang the cats with your fist, does it rattle or tap it with a rubber mallet. a broken down cat will choke the engine easily. it kind of sounds from your description that could be a cause. also the O2 sensors.
Just changed cat and sensors in last 3 months
order an ELm 327 cable (a couple of quid) off ebay and download some software to look at the live run data. if you get stuck finding the software let me know and i'll send you a link to my dropbox with it
I will do that..... does the software have a name I could google search for it?
MAF, O2 and cylinder sparking should be able to be seen from that
look at the sparking of the HT leads. could indicate a failed HT lead.
The ht leads are new but we felt of poor quality. The last time the problem occurred we took leads off and back on again to ensure a firm connection on plugs. The problem disappeared for a few days. Will repeat exercise today. We will also do fault check again.
also check for any vac leaks from deteriorated rubber piping.. as wild stab in the dark I would guess and its a pure guess the cat broken down and starting to block the exhaust
As above, changed in last 3 months.
if its not throwing fault codes, its something that
