Disco-Ron Posted October 23, 2014 Share Posted October 23, 2014 L reg 3.9.... runs smoothly at idle and if you increase the revs slowly, but if you blip the throttle it misses and sometimes backfires... Have checked the tps and the voltage increases smoothly through out the movement, am thinking maf.... anyone care to agree??..... Ta Quote Link to comment Share on other sites More sharing options...
rocksteady Posted October 24, 2014 Share Posted October 24, 2014 That sounds like mine did when one of the lobes went on the cam. Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted October 24, 2014 Author Share Posted October 24, 2014 Ah. Interesting. .. it ticks a bit when starting from cold. But it goes. Assumed that was a lifter. Wax gonna replace cam etc before transplantation into my 90 anyway. Just ideally wanted to get it running right before I take it all apart. .. Thanks Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted October 24, 2014 Author Share Posted October 24, 2014 Fitted a known good maf and it's still the same. ... Any other ideas before I assume the cam is dead. Don't really want to rip the engine apart in the discovery when it's coming out anyway. Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted October 24, 2014 Author Share Posted October 24, 2014 Fitted a known good maf and it's still the same. ... Any other ideas before I assume the cam is dead. Don't really want to rip the engine apart in the discovery when it's coming out anyway. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted October 25, 2014 Share Posted October 25, 2014 Have you checked the timing? Also check for inlet tract air leaks. Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted October 27, 2014 Author Share Posted October 27, 2014 Hopefully now sorted. ... Thanks. Bit embarrassing really. I swear I checked the vacuum advance. However with another suck it wasn't doing anything. Fitted another and it now appears to be fine. ... hard to be totally sure as the truck isn't taxed so I can't road test it..... but it certainly revs cleanly now. ..... Quote Link to comment Share on other sites More sharing options...
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